6th science Chapter- Components of foods Solved Questions
Q. What is Nutrients?
Ans: The chemical present in food is called nutrients .
Q. What are major components of foods?
Ans: The major components nutrients are: carbohydrates,Fats,Vitamins,Proteins,Minerals,Roughage and Water
Q. What are major nutrients of foods?
Ans: carbohydrates, Fats, Vitamins , Proteins and Minerals
Q. Name the components of food other than nutrients that are needed by our body.
Ans: Components of food other than nutrients that are needed by our body are dietary fibers and water
Q. What are fats? What are its types?
Ans: Fats are energy giving nutrients comes from plants and animals.
Fats comes from animal are called animal fats like milk cheese, butter etc.
Fats comes from plants are called vegetable fats like fruit , coconut, soya beans etc
Q. How fats are use full to us?
Ans: Fats give us energy. Fats also protect skin from injury, heat and cold. fats also absorb vitamins from fats soluble vitamins.
Q. why we do not eat excess fats?
Ans: If we eat excess fats they store under skin and cause high blood pressure and overweight. So avoid eating fried foods.
Q. What is obesity?
Ans: Obesity is a condition caused due to overeating of fats.
Q. How you test presence of fats in food?
Ans: We take paratha and wrap in a tissue paper. We will notice there is oil patches on paper.It make paper translucent. Patches on the paper shows presence of fats in food.
Q. What are major elements presents in food?
Ans: Carbon, hydrogen and oxygen are major elements presents in food
Q. why carbohydrates are called energy giving foods?
An: carbohydrates change into sugar in human body that burn with oxygen in cells of our body ang give us energy. So carbohydrates are called energy giving foods.eg Rice wheat maize.
Q. Why patients and Sport man are given Glucose solution?
Ans: Glucose gives our body energy instantly.
Q. How can you test presence of starch in food?
Ans: We take mashed food in test tube. If we adds some drops of iodine solution in test tube, colour of solution change into blue black .This shows the presence of starch in food
Q. How can you test presence of sugar in food?
Ans: We take fruit juice in test tube. If we adds some drops of Benedict’s solution in test tube, colour of solution change into red .This shows the presence of sugar in food
Q. Why proteins are called body building foods?
Ans : Proteins help us to builds new cells and repair worn out cells. They are made up of carbon , hydrogen , oxygen and nitrogen.
Q. What are two types of proteins?
Ans: Proteins obtain from plants are called vegetable protein like fruits, pea nuts and many beans.Soya bean is richest source of proteins. Proteins obtain from animals are called animalproteins like fish ,egg, meat ,milk
Q. How can you test presence of protein in food?
Ans: We take a small quantity of food item in a test tube. Add 10 drops of water into it and shake the test tube. Now add two drops of copper sulphate solution and ten drops of caustic soda solution to the test tube. Shake the test tube and let it stand for a few minutes. The appearance of violet colour indicates the presence of proteins in the food item.
Q. why growing children needs food rich in proteins?
Ans Protein helps in formation and development of new Cells of body so growing children needs food rich in proteins.
Q. What are vitamins?
Ans: Vitamins are disease protective nutrients like Vitamins A,B,C,D,K and E. The main sources of vitamins are green leafy vegetables and fruits. There two types of vitamins: Water soluble:- Vitamin C and group of vitamin B Fat soluble:- Vitamin A , Vitamin D, Vitamin E and Vitamin K
Q. Why do deficiency diseases occur?
Ans: Deficiency diseases occur due to lack of nutrients in our body e.g. PCM, PEM, Beriberi scurvy, Goiter etc.
Q. Why we need to eat essential vitamins in food?
Ans: Vitamins fight against diseases and keep various organ of our body healthy so , we need to eat essential vitamins in food.
Q.Deficiency of which nutrients make a person thin and weak and causes stunted growth?
Ans: Carbohydrates and Proteins
Q. what are the functions of different vitamins. Make list?
Ans: Vitamin A -----------------à keeps skin and eyes healthy.
Vitamin C ----------------à helps body to fight against many diseases.
Vitamin D -----------------à helps our body to use calcium for bones and teeth
Q. How fats are use full to us?
Ans: Fats give us energy. Fats also protect skin from injury, heat and cold. fats also absorb vitamins from fats soluble vitamins.
Q. why we do not eat excess fats?
Ans: If we eat excess fats they store under skin and cause high blood pressure and overweight. So avoid eating fried foods.
Q. What is obesity?
Ans: Obesity is a condition caused due to overeating of fats.
Q. How you test presence of fats in food?
Ans: We take paratha and wrap in a tissue paper. We will notice there is oil patches on paper.It make paper translucent. Patches on the paper shows presence of fats in food.
Q. What are major elements presents in food?
Ans: Carbon, hydrogen and oxygen are major elements presents in food
Q. why carbohydrates are called energy giving foods?
An: carbohydrates change into sugar in human body that burn with oxygen in cells of our body ang give us energy. So carbohydrates are called energy giving foods.eg Rice wheat maize.
Q. Why patients and Sport man are given Glucose solution?
Ans: Glucose gives our body energy instantly.
Q. How can you test presence of starch in food?
Ans: We take mashed food in test tube. If we adds some drops of iodine solution in test tube, colour of solution change into blue black .This shows the presence of starch in food
Q. How can you test presence of sugar in food?
Ans: We take fruit juice in test tube. If we adds some drops of Benedict’s solution in test tube, colour of solution change into red .This shows the presence of sugar in food
Q. Why proteins are called body building foods?
Ans : Proteins help us to builds new cells and repair worn out cells. They are made up of carbon , hydrogen , oxygen and nitrogen.
Q. What are two types of proteins?
Ans: Proteins obtain from plants are called vegetable protein like fruits, pea nuts and many beans.Soya bean is richest source of proteins. Proteins obtain from animals are called animalproteins like fish ,egg, meat ,milk
Q. How can you test presence of protein in food?
Ans: We take a small quantity of food item in a test tube. Add 10 drops of water into it and shake the test tube. Now add two drops of copper sulphate solution and ten drops of caustic soda solution to the test tube. Shake the test tube and let it stand for a few minutes. The appearance of violet colour indicates the presence of proteins in the food item.
Q. why growing children needs food rich in proteins?
Ans Protein helps in formation and development of new Cells of body so growing children needs food rich in proteins.
Q. What are vitamins?
Ans: Vitamins are disease protective nutrients like Vitamins A,B,C,D,K and E. The main sources of vitamins are green leafy vegetables and fruits. There two types of vitamins: Water soluble:- Vitamin C and group of vitamin B Fat soluble:- Vitamin A , Vitamin D, Vitamin E and Vitamin K
Q. Why do deficiency diseases occur?
Ans: Deficiency diseases occur due to lack of nutrients in our body e.g. PCM, PEM, Beriberi scurvy, Goiter etc.
Q. Why we need to eat essential vitamins in food?
Ans: Vitamins fight against diseases and keep various organ of our body healthy so , we need to eat essential vitamins in food.
Q.Deficiency of which nutrients make a person thin and weak and causes stunted growth?
Ans: Carbohydrates and Proteins
Q. what are the functions of different vitamins. Make list?
Ans: Vitamin A -----------------à keeps skin and eyes healthy.
Vitamin C ----------------à helps body to fight against many diseases.
Vitamin D -----------------à helps our body to use calcium for bones and teeth
Vitamin E -------------------à Help muscles to work and give Protection to liver
Vitamin K -------------------à Help blood to clotting.
Q. Which vitamin can be prepared by our body in the presence of sunlight?
Vitamin K -------------------à Help blood to clotting.
Q. Which vitamin can be prepared by our body in the presence of sunlight?
Ans: Vitamin D
Q. Why food should not be overcooked?
Ans: Food should not be overcooked to prevent the loss of nutrients from it
Q. What are minerals?
Ans: Minerals are nutrients that help to keep the body healthy. Like calcium, copper, zinc, potassium, iodine. The main source of minerals are green leafy vegetable, egg, meat, fish,salts etc.
Q. Which mineral help in building of bones and teeth
Q. Why food should not be overcooked?
Ans: Food should not be overcooked to prevent the loss of nutrients from it
Q. What are minerals?
Ans: Minerals are nutrients that help to keep the body healthy. Like calcium, copper, zinc, potassium, iodine. The main source of minerals are green leafy vegetable, egg, meat, fish,salts etc.
Q. Which mineral help in building of bones and teeth
Ans: Calcium
Q. Which mineral help in making blood?
Q. Which mineral help in making blood?
Ans: Iodine
Q. Which mineral help in maintaining fluid balance in body
Q. Which mineral help in maintaining fluid balance in body
Ans: Sodium and potassium
Q. Why elderly women and children need more calcium?
Ans: To make bones stronger
Q. A child is having a swollen neck and is mentally disabled. What disease is he suffering from?
Ans: The child is suffering from goiter.
Q. Which disease is caused due to deficiency of iron?
Q. A child is having a swollen neck and is mentally disabled. What disease is he suffering from?
Ans: The child is suffering from goiter.
Q. Which disease is caused due to deficiency of iron?
Ans: Anemia
Q. Name the vitamin which gets destroyed on heating.
Q. Name the vitamin which gets destroyed on heating.
Ans: Vitamin C.
Q. Why should we eat a balanced diet?
Ans: Our body needs all the nutrients in right amount hence we should eat a balanced diet
Q. Why do we need water in our food?
Q. Why should we eat a balanced diet?
Ans: Our body needs all the nutrients in right amount hence we should eat a balanced diet
Q. Why do we need water in our food?
Ans: We need water in our food because:
1. It helps in absorption of the nutrients in the body.
2. It helps in removal of the wastes from the body.
Q. Which food provide water to our body?
Ans: We get water from tea, coffee, fruits, vegetables, etc.
Q. Name the main nutrient present in the following :(a)Egg white (b)Papaya(c) Ghee
Ans: (a) Proteins(b) Vitamin A (c) Fats
Q. What role does dietary fibres play in our body?
Ans: Dietary fibres help in the removal of undigested food from the body.
Q. What are the symptoms of rickets?
Ans: Soft and bent bones.
Ans: (a) Anaemia (b) Loss of vision (c ) Beriberi (D) Scurvy.
Q: Name the disease caused by lack of proteins?
Ans: Kwashiorkor in child. In Kwashiorkor child became thin and weak and having swollen abdomen
Q: Name the disease caused by lack of proteins and carbohydrates?
Ans: Marasmus in which ribs became prominants and skin became dry and wrinkled
Hots:
Q. Name three aquatic plants eaten by us as food
Ans: Indian Lotus (Nelumbo nucifera) , Water spinach (Ipomoea aquatica) ,Rice (Oryza)
Q. why is milk considered as complete food?
Ans: Milk is considered to be a complete food because it contains all the essential nutrients such as sugars, proteins, vitamins and minerals. One glass of whole milk contains about 150 calories of energy.
Q. List three common plants having medicinal use?
Ans: Tulsi, Aloe Vera, Garlic, Peppermint
Q. Does honey bee eat honey as a food?
Ans: No, Honey bee eats nectar and pollen grains.
Q. Why should we do not wash vegetable after cutting them?
Ans: we do not wash vegetable after cutting to preserve the water soluble vitamins
Or,
Ans: Milk is considered to be a complete food because it contains all the essential nutrients such as sugars, proteins, vitamins and minerals. One glass of whole milk contains about 150 calories of energy.
Q. List three common plants having medicinal use?
Ans: Tulsi, Aloe Vera, Garlic, Peppermint
Q. Does honey bee eat honey as a food?
Ans: No, Honey bee eats nectar and pollen grains.
Q. Why should we do not wash vegetable after cutting them?
Ans: we do not wash vegetable after cutting to preserve the water soluble vitamins
Or,
Vegetables contain vitamins and minerals which get washed away if vegetables are washed after cutting them. Hence vegetables should not be washed after cutting.
Q.How can you prepare ORS with sugar and salts?
Ans: Take one teaspoon of salt, eight teaspoons of sugar, one litre of clean drinking or boiled water after cooling. Stir the mixture till the salt and sugar dissolve.
Q. Why should we do not drink cold drink like coca cola, pepsi?
Ans: Soft drinks do not have any nutritional value.). They have higher sugar content, higher acidity, and more additives such as preservatives and colorings. So avoided drink like coca cola, pepsi.
Q. Make list of diet chat of pregerant women
Ans: Greenve getables, Fulses, Soyabean, Milk,banana
Q.How can you prepare ORS with sugar and salts?
Ans: Take one teaspoon of salt, eight teaspoons of sugar, one litre of clean drinking or boiled water after cooling. Stir the mixture till the salt and sugar dissolve.
Q. Why should we do not drink cold drink like coca cola, pepsi?
Ans: Soft drinks do not have any nutritional value.). They have higher sugar content, higher acidity, and more additives such as preservatives and colorings. So avoided drink like coca cola, pepsi.
Q. Make list of diet chat of pregerant women
Ans: Greenve getables, Fulses, Soyabean, Milk,banana
6th Components of foods Extra score Questions
CLASS 6
Getting to know plants
Q1 Differentiate between herbs and shrubs
A Herbs shrubs
Short plants upto 1 metre in height Bigger plants with woody stem
Soft stems Woody stem
May not have branches Branches away from the early part of the stem
Eg maize mango
Q2 Identify the plants as herbs shrubs and treesa)
rice-Herb b) tomato-herb c) china rose-shrub d)eucalyptus-tree
Q3 Differentiate between Climbers and Creepers
A Climbers Creepers
Small plants with very soft stem which needs
support on neighbouring structures and climb
up
Plants with weak stems that cannot stand
upright and spread on the ground
Q4A girl in biology laboratory observes a design on different leaves. She identified two particular kinds of pattern. Identify those
patterns and write difference between two.
A Two pattern are reticulate and parallel venation.
Reticulate venation Parallel venation
Veins of leaf forms network like design Veins are parallel to each other
Q5‘Stem has two way traffic.’ Comment.
A Because of 2 reasons-
1) it conducts water and minerals from roots to different parts of plant
2) it translocate food to different parts of plant
Q6A boy covers a leaf with a polythene bag and leaves it for 24 hours. What will he observe and why?
A He will observe water droplets because of transpiration.
Q7Enlist all the functions of a leaf.
A a Photosynthesis
b) gaseous exchange
c)transpiration
Q8What is the function of veins and midrib in a leaf?
A Transportation of food,water and minerals
Q9Write down the functions of roots.
A a) It helps in the conduction of water and minerals from soil to stem
b)it stores food
c)fix the plant to the soil
d)give support and prevent soil erosion
Q10Write two points of difference between tap root and fibrous roots.
A
Tap root Fibrous root
There is a main root which grows vertically down
It is a strong root system
There is no main root.it is replaced by a large no. of
fibre like root
It is a week root systemQ11If we want to identify the kind roots of a plant, how can we find out by observing the leaves?
A If the leaves have parallel venation then the plants have fibrous roots.If the leaves have reticulate venation then plants have
tap root system
Q12Why is it difficult to separate the sprouted young plants from the cotton wool?
A Because roots help the plant firmly in the soil.
Q13Give few examples of edible root
A turnip,carrot
Q14Give few examples of edible stem
A Potato,onion
Q15 Name 4 whorls of a flower
A a) sepals b)petals c) stamen d)pistil
Q16How are fruits and seeds produced?
A Fruits are formed from ovary .Seeds are formed from ovules
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VI SOURCE OF FOOD Notes
Food: A fuel for every body
Sources of food : Plants –Ingredients - fruits, vegetables, grains
Animals- meat, milk, eggs and Earth – salt and water
Functions of foods - 1] Provide energy to do activity 2] Protect from diseases 3] Help to grow cells and
repair worn out cells
Why food is essential?
Food is essential as it contains chemical that fulfill demand of our body called nutrients.
Producers – Plants prepare their own food and called producer .
Food habits: Different organism eat different things according to that they are devided into following types
1] Herbivores – Those animals that eat plants only. They have sharp cutting teeth in front and flat , grinding
teeth at the back. Ex. Cow, deer
2] Carnivores – Animals that eat
the flesh of other animals like snake, eagle vulture etc.
3] Omnivores – Animals that eat both pants and animals like Humans, crow
4] Scavengers – Animals that eat dead bodies of animals and in this way help to clean
environment.
5] Parasites – Animals depends on other living animals for their food is called parasites.
Food chain – Who eats what in the environment makes up food chain. It starts from plans.
Grass Zebra Lion
Food chain shows us interdependence of various organism in the environment.
If one of the organism disappears life cycle unbalanced.
Components of foods are of six kinds –
1] Carbohydrates.: It gives us energy. In food it is present in the form of Sugars and Starches. . Sugars are
simple Carbohydrates provide quick energy than Starches. Rice, wheat, banana, potato are good source of
carbohydrates
2] Fats - It is also source of energy even more than Carbohydrates. Fats are stored under the skin and
around the heart and kidney. Fats get deposited in the lining of our blood vessels and makes them narrower
therefore our heart has to push blood harder through blood vessels .This increases the risk of hearts. It
obtains from plants and animals like ghee, butter, oil, nuts etc.
3] Proteins – It helps to grow new cells and repair damaged cells that’s why it is called body building food
.Animals proteins are milk, egg, cheese, meat. Plants proteins are pulses, barley, wheat.
4] Vitamins: It gives protections from diseases.
Vitamins importance deficiency diseases
A Normal growth, keep eyes and skin healthy Night blindness
B1 Growth and developments beri - beri.
B2 Healthy skin, growth retarded growth
B12 Form RBC cells Anaemia
C Healthy growth scurvy
D Form bones and teeth strong rickets
K Helps in clothing of blood Excessive bleeding from wound
5] water –The main sourse of water is fruits and vegetables. it helps to transports food , waste, chemicals,
and gasses through out body . It helps to break down complex food molecules , It helps to remove waste in
the form of urine and sweats.
About 70% body weight is water so we need 6 to 8 glass of water per day
6] Roughage : The components’ of food that cannot be digested by the body is called roughage . It prevents
constipation and ensure proper bowel movement. A high fibrous diet reduce the heart disease and bowel
Cancer.
Balance diet: A diet that contains all the nutrients in proper amounts. It is not same for every body ,It varies
according to age , sex and work done.
Deficiency disease: Disease cause by lack of nutrients eg kwashiorkor, marasmus
Obesity - Excessive intake of carbohydrates causes overweight it is called Obesity.
Kwashiorkor -- A disease caused by lake of proteins in body .The stomach becomes swollen and legs
became thin
Marasmus: A disease caused by lake of protein and carbohydrates . The child becomes so thin that loose
folds of skin can be seen all over the body .
Goiter : A disease caused by lack of mineral iodine . In these diseases the thyroid gland becomes swollen
and reduces production thyroxin that control growth.
Rickets – In this bones becomes soft and get bent and deformed . It is caused by lake of vitamins D. Lack of
phosphorus also affect bones and teeth.
How is honey made?
Honey bees collect nectar from flower and put into beehive. There they converted into honey.
Cooking of food in good way is essential ---
1] Vegetables and fruits cannot be washed after cutting or peeling them.
2] Food should be cooked in just enough water to save nutrients.
3] Raw fruits can not be boiled or heated to save vitamins.
1. In western countries persons eat more meat suffer from constipation because they do not eat fiber
roughage in diet.
2. We will not remain h
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6th Science: Changes around us Notes and solved Questions
Changes around us are continuous process.
Some changes occur naturally and some changes can be brought about by us. Such changes are: Rusting of iron, change of the state of water, Burning of wood, Growth of nail and hair, Blooming of flower and change in day and night ,season change,
Some changes occur naturally and some changes can be brought about by us. Such changes are: Rusting of iron, change of the state of water, Burning of wood, Growth of nail and hair, Blooming of flower and change in day and night ,season change,
What are different types of changes?
1. Reversible changes: Changes that can be reversed is called Reversible changes. Example: water changes into ice on cooling, wax change into liquid on heating, blowing of balloon
2. Irreversible changes: Changes that cannot be reversed is called irreversible changes. Like Milk change in to curd, Iron changes to rust, Burning of paper, cooking of food, Growth of plant and animals, weathering of rocks, wear and tear of tires.
3. Physical changes: Changes in which physical properties like shape, size and state changes without formation of new substance is called Physical changes. It is a type of reversiblechanges. e.g. Melting of wax, solution of sugar and water, Boiling of water, Expansion of iron on heating.
4. Chemical changes: A change in which new substance is formed is called chemical changes. it cannot be reversed .Burning of paper, growth of nail, Rusting of iron etc.
5. Exothermic changes: Change in which heat is given out is called exothermic changes.
Carbon (c) + oxygen (O) ---- burning----> Carbon dioxide (Co2) + Heat
Quick lime (CaO) + Water ------> Calcium hydroxide {Ca (OH)2 } + Heat
6. Endothermic Changes: The changes takes place by absorption of heat is called Endothermic Changes For example
Iron + sulphur ----Heat-------> Iron sulphide
Milk + sugar --- Heat ------> Sweet milk
Q. what is fast and slow change?
Ans: Fast changes: Changes that occur quickly is called Fast changes e.g burning of match stick, burning of fire cracker, Evaporation of petrol, burning of magnesium ribbon.
Slow Changes: Changes that occur slowly is called slow change like growth of nail, rusting of iron.
Q. What is combustion?
Ans: The burning of fuel on heating is called combustion. Heat and light is produced during combustion.e.g.Burning of Wood, burning of petrol, burning of LPG etc. Some substance catch fire on heating easily is called inflammable substance like paper, petrol, LPG, CNG etc.
Q. What is melting?
Ans: Changing of ice into water on heating is called melting. A constant temperature at which ice melt into water is called melting point.
Q. what is evaporation?
Ans: Changing of water into gas on heating is called evaporation. A constant temperature at which water changes into water vapour is called latent heat of evaporation.
Q. What is freezing?
Ans: Changing of water into ice on cooling is called freezing.
Q. What is condensation?
Ans: Changing of water vapour into water is called condensation.
Q. What are sublimation and decomposition?
Ans: The process of converting solid directly into gas is called sublimation. Such types of substance are called Sublime substance. Like petrol, camphor. The process of converting gas directly into solid is called decomposition.
Q. what is expansion?
Ans: When any substance is heated expand this is called expansion. When any substance cool contract.
Q. Give two examples occur on heating?
Ans: State change and expansion
Q. What happen when solid changes into liquid?
Ans: When solid is heated its molecules gain energy and move apart from each other and change into liquid.
Q. What changes you notice when you burn candle? Discuss the reason of the shortening of candle.
Ans: When candle burn, Wax converted into liquid wax that is physical change. Some of the wax converted into gas that is Chemical change.
Q. What are the various forms of changes you notice around you?
Ans: physical change, Chemical change, state changes, Reversible changes, Irreversible changes
Q. How expansion and contraction are use full in fitting iron rim on wooden wheels?
Ans: When iron ream is heated it expands and easily fitted on wooden wheel. When cold water is poured on rim it contracts and tightly fixed on rim.
Q. What happen when things are heated beyond certain temperature?
Ans: when things are heated beyond certain temperature they change their states It is a physical changes.
Q. Why does milk in saucepan overflow when heated over gas?
Ans: On heating, particles of milk absorb heat and stats moving away and overflow from saucepan.
Q. why you are not able to hold metal rod when other end of rod is heated?
Ans: when one end of rod is heated, heat passes from one end to other end because iron is good conductor of heat. So we cannot hold metal for long rod when is heated.
Q. What are periodic and non-periodic changes? Give examples.
Ans: Periodic change- A change that occurs during a definite time interval is known as periodic change, e.g., phases of moon, heart-beat, etc.
Non-periodic change- A change that does not repeat again and again after a regular interval of time is called non-periodic change, e.g., earthquake, flood
Q. What is a solution?
Ans: Mixture of solid in liquid is called solution is formed. Like sugar and water solution.
Q. Define pasteurization.
Ans: Heating of milk for boiling to kill microbes is known as pasteurization. Milk is prevented from spoilage for several days by pasteurization.
Q. The shape of a paper sheet changes when you make an aero plane from it. Can you reverse this change?
Ans: Yes, this change can be reversed by unfolding the paper aero plane because it is physical change.
Q. Can deforestation be considered as a reversible change?
Ans: Deforestation is practice of the cutting down of tree or clearing forest. No, deforestation cannot be considered as a reversible change because it cannot take place in reverse direction. Forests cannot be grown quickly.
Q. Why do we keep vegetables or fruits in refrigerator?
Ans: Vegetables or fruits are spoiled by bacteria and other microbes. To prevent them from spoilage, they are stored at low temperature in refrigerator where microbes are unable to survive.
Q. Why dissolving sugar in water is a reversible and physical change?
Ans: Dissolving sugar in water is a reversible and physical change as sugar can be obtained back by applying a physical method called evaporation.
Q. Why rotation of a fan is a periodic change.
Ans: The rotation of a fan is a periodic change because the change occurs after a fixed interval of time.
Q. Why the cooking of food is a chemical change.
Ans: The cooking of food is a chemical change as after cooking the food, new product is formed that cannot be reversed into previous food.
Q. Why the melting of an ice candy is a reversible change.
Ans: The melting of an ice candy is a reversible change because ice candy melts due to increased temperature (room temp.) Melted ice candy can be solidified by freezing it. Hence, this is also a physical change.
Q. Why making statues out of plaster of Paris is an irreversible and chemical change.
Ans: Making statues out of plaster of Paris is an irreversible and chemical change because plaster of Paris has a property of setting into a hard mass on getting mixed with water due to the formation of a new compound. The hard mass cannot be converted back into the previous plaster of Paris. Hence, it is an irreversible chemical change.
Q. What are desirable & undesirable changes?
Ans. Desirable changes: Those changes which are desired to occur that is we want them to take place are known as desirable changes. Example: ripening of fruits, germination of seeds etc.
Undesirable change: Those changes which we do not want to take place are called undesirable changes.
Example: rusting of iron, souring of milk, rottening of fruits etc.
Q. What are slow & fast changes? Give example.
Ans. Slow change: Those changes which take place in a long period of time are called slow changes. Example: rusting of iron, germination of seeds etc.
Fast change: Those changes which take place in a short time are called fast changes. Example: burning of paper, bursting a balloon.
Q. How is inflating a balloon different from bursting an inflated balloon?
Ans. Inflating a balloon is an example of a reversible change whereas bursting a balloon is irreversible change.
When we blow air into a balloon, its shape and size changes. But it regains its original form when the air is allowed to escape. On the other hand a brusted balloon cannot be changed back to the original form.
Q.How does a blacksmith change a piece of iron into different tools?
Ans. A blacksmith first heats a piece of iron till it becomes red hot. It then becomes soft and can be beaten into desired shape.
Q. You must have seen that construction workers heat a black material called coal tar for repairing a road. State whether the change which has occurred in coal tar on being heated is reversible or irreversible.
Ans. When coal tar is heated, it melts to form a thick dark liquid. The melting of coal tar is a reversible change as it solidifies again on cooling.
CBSE_NCERT VI Chapter:
Animal Form and Functions Solutions
Class VI Chapter: Animal Form and Functions
Q1. Name the system that transports nutrients oxygen and waste?
Ans: Circulatory system
Q.2. The mouth is the part of which bodily system?
Ans: Digestive system
Q.3. kidney is part of which system?
Ans: Excretory system
Q.4. what are the animals with back bone known as?
Ans: vertebrates.
Q.5. which fin of fish help to swim?
Ans: Paired fins
Q.6. Do the joint between rib and breast bone allow movement?
Ans: No
Q.7. How many bone a human body have?
Ans: A child have 306 bones some of which latter fuse hence fully grown body have 206 bones
Q. 8. Name the organism born with extra rib called gorilla rib?
Ans: Gorilla
Q.9. What is the given to the first vertebra of the vertebral column support skull?
Ans: Atlas and bones called yes bones
Q.10. What is science in which we study about bones?
Ans: Osteology.
Q.11. What is science in which we study about muscles?
Ans: Myology.
Q.11. Name the two organ protected by rib cage?
Ans: Heart and Lungs
Q.12. Define cell and tissue?
Ans: cell is basic and functional unit of Life. A group of similar cell is called tissue.eg. bones, blood
Q.13. What is bone marrow. Mention its functions?
Ans: A soft substance present in bones called Bone marrow. it makes blood cell.
Q.14. What is joint what are its types?
Ans: The place where two bones join together is called joints. Types of joints are Fixed joint, Ball and
socket joints, Hing Joint, Gliding Joints, Pivotal joint.
Q. 15.What is organ system? Name organs of digestive system?
Ans: A group of Organs form organ system. Mouth, esophagus, stomach and intestine formdigestive system
Q.16. what is ball and Socket joints?
Ans: The joint that allows movement in all direction is called ball and socket joint .like arm, Shoulder, hip and Thigh joints.
Q.17.Explain three types of skeleton?
Ans: Skeleton found outside the body is called exoskeleton like Skeleton of crab and snail. It ptotect, give
sense and help in feeding and excretion.
Skeleton found inside the body is called endoskeleton like Skeleton of fish, bird reptiles etc.
Skeleton found inside the body in the form of liquid is called liquid skeleton like Skeleton of earth worm,
caterpillar.
Q.18. what are the types joints?
Ans: Types of joints are:
Fixed joint -Skull
Ball and socket joints- arm, shoulder, hip and Thigh joints.
Hinge Joint :- knee, elbow and Ankle
Gliding Joints- backbone,sole of foot
Pivotal joint.- Neck
Q.19. how do muscles help to move bones?
Ans: A pairs of muscles helps bone to move. When one of them contracts, the bone is pulled in that
direction. The other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed
muscle contracts to pull the bone towards its original position, while the first relaxes.
20. Differentiate between Floating and Fixed rib.
Ans: The last two pairs of ribs which are free called floating rib. Whereas rest of 10 pairs which are not free and forma cage is called fixed rib.
======================================
CBSE 6th Science:Living things and Non living things
Things, which do not grow, move, or respond are called non-living things.
Things that grow, breathe, and respond are called living things.
PROPERTIES OF LIVING THINGS
(a) All living things grow: Infant grows into a child, Plants grow from seeds, Puppies grow into dogs, and kittens grow into cats.
(b) All living things can move: Living things move from place to place in search of food is called Locomotion
(c) All living things need food to live: Living things eat food to get energy to live.
(d) All living things Respire: Living things eat and digest foods that get oxidized in body to release energy. This process is called Respiration. Respiration occurs inside body. Exchange of carbon dioxide and oxygen in living body is called breathing. Breathing occur outside the body. Plant breath through stomata and animal through nose. Small animal and microbes exchange gases by diffusion.
(e) All living things reproduce: Living things can produce young one of similar kinds. This process is called reproduction. Some animal give birth to young ones like dog, cow; Some animal lay eggs like bird, hen ; Plant grow from seeds ,stem and root etc.
(f) All living things respond: Living things can respond against touch, heat, light and gravity called stimulus. Change in our surrounding that make living things respond to them, are called stimuli. Touch me not plant show response to touch and its leaves hang down.
(g) All living things are made up of different kinds of cells. Group of cell is called tissue. Group of tissue is called organ. A group of organs is called organ system that work together to keep our body live.
(h) Living things excrete: Living Things throw waste outside body like sweat, urine, faeces. This process is called excretion. Plants excrete gum, leaves, latex etc
Q. What is habitat?
Answer: The surroundings where plants and animals live, is called their habitat. The presence of specific features, which enable a plant or an animal to live in particular habitat, is called adaptation.
Q. Which organism grow throw their lives
Ans: Plants
Q. What do living organism produce when oxygen combine with food?
Ans: Energy and carbon dioxide
Q. Name the process of giving out waste from body
Ans: Excretion
Q. What is the time within which a living stay alive?
Ans: life span
Q. what is by product of respiration?
Ans: Carbon dioxide
Q. what is similarity of cell and an atom of matter?
Ans: Both are structural units.
Q. Name a plant that shows response to stimulus?
Ans: Touch me not and sunflower
Q. State any two similarities between living and non living?
Ans: Both are made up of matter and have structural unit .
Q. what are the factors on which growth of living things depends on?
Ans: Growth in living things depends on: Food, climate, environment and life style
Q. List the way in which living and non living respond to external stimuli?
Ans: Living things respond to light, heat, smell, pain etc. We cry when any one prick to us. leaves of plant wither in hot day, Leaves and stem of plant grow towards light.non living thins change shape and size on heating or cooling.
Q. Discuss different way ways by which living things reproduce?
Ans: See topic: All living things reproduce
Q. How can you prove that CO2 is by product of respiration?
Ans: We take lime water Ca (OH)2 in a beaker. Blow some air to mouth though a straw. Lime tun milky that shows presence of carbon dioxide.
Q. Why do root of plant grow in soil?
Ans: Root of plant show response to the earth gravity and grow in soil to get water and mineral.
Q. Fire –consume oxygen, moves from one place to other and respond to stimuli. Is fire living .Justify
Ans: no fire is not living things as it is not made up of living cells
Q. On what factors weather forecasting is done?
Ans: Climate , Distance from sun, wind speed any thousands of other factors
Q. How does exchange of gases take place in an earthworm?
Ans: Exchange of gases in an earthworm takes place through its moist skin.
Things that grow, breathe, and respond are called living things.
PROPERTIES OF LIVING THINGS
(a) All living things grow: Infant grows into a child, Plants grow from seeds, Puppies grow into dogs, and kittens grow into cats.
(b) All living things can move: Living things move from place to place in search of food is called Locomotion
(c) All living things need food to live: Living things eat food to get energy to live.
(d) All living things Respire: Living things eat and digest foods that get oxidized in body to release energy. This process is called Respiration. Respiration occurs inside body. Exchange of carbon dioxide and oxygen in living body is called breathing. Breathing occur outside the body. Plant breath through stomata and animal through nose. Small animal and microbes exchange gases by diffusion.
(e) All living things reproduce: Living things can produce young one of similar kinds. This process is called reproduction. Some animal give birth to young ones like dog, cow; Some animal lay eggs like bird, hen ; Plant grow from seeds ,stem and root etc.
(f) All living things respond: Living things can respond against touch, heat, light and gravity called stimulus. Change in our surrounding that make living things respond to them, are called stimuli. Touch me not plant show response to touch and its leaves hang down.
(g) All living things are made up of different kinds of cells. Group of cell is called tissue. Group of tissue is called organ. A group of organs is called organ system that work together to keep our body live.
(h) Living things excrete: Living Things throw waste outside body like sweat, urine, faeces. This process is called excretion. Plants excrete gum, leaves, latex etc
Q. What is habitat?
Answer: The surroundings where plants and animals live, is called their habitat. The presence of specific features, which enable a plant or an animal to live in particular habitat, is called adaptation.
Q. Which organism grow throw their lives
Ans: Plants
Q. What do living organism produce when oxygen combine with food?
Ans: Energy and carbon dioxide
Q. Name the process of giving out waste from body
Ans: Excretion
Q. What is the time within which a living stay alive?
Ans: life span
Q. what is by product of respiration?
Ans: Carbon dioxide
Q. what is similarity of cell and an atom of matter?
Ans: Both are structural units.
Q. Name a plant that shows response to stimulus?
Ans: Touch me not and sunflower
Q. State any two similarities between living and non living?
Ans: Both are made up of matter and have structural unit .
Q. what are the factors on which growth of living things depends on?
Ans: Growth in living things depends on: Food, climate, environment and life style
Q. List the way in which living and non living respond to external stimuli?
Ans: Living things respond to light, heat, smell, pain etc. We cry when any one prick to us. leaves of plant wither in hot day, Leaves and stem of plant grow towards light.non living thins change shape and size on heating or cooling.
Q. Discuss different way ways by which living things reproduce?
Ans: See topic: All living things reproduce
Q. How can you prove that CO2 is by product of respiration?
Ans: We take lime water Ca (OH)2 in a beaker. Blow some air to mouth though a straw. Lime tun milky that shows presence of carbon dioxide.
Q. Why do root of plant grow in soil?
Ans: Root of plant show response to the earth gravity and grow in soil to get water and mineral.
Q. Fire –consume oxygen, moves from one place to other and respond to stimuli. Is fire living .Justify
Ans: no fire is not living things as it is not made up of living cells
Q. On what factors weather forecasting is done?
Ans: Climate , Distance from sun, wind speed any thousands of other factors
Q. How does exchange of gases take place in an earthworm?
Ans: Exchange of gases in an earthworm takes place through its moist skin.
==========================
th Science:Measuring distance and motion : Questions Answer
Measurement and Motion :Quest Time
|
Answer the following question in one word
1. Name one object that shows multiple motions?
Ans: The Earth - Rotatory and translator motion
Drilling - Rotatory and downward translator motion
A ball moving along the ground- Rotatory and Rectilinear motion
2. How will you measure length in SI system?
Ans: Using meter scale
3. What is the quantity that can be measured?
Ans: Physical quantity like mass, length and Time
4. What type of motion body moves as a whole?
Ans: Translatory motion
5.Which kind of motion produce sound?
Ans: Vibratory motion
6. What types of motion is noticed in the pendulum of clock and swing?
Ans: Oscillatory motion and periodic
7. Falling of apple from tree is what types of motion?
Ans: Rectilinear motion.
8. Discovery of what made transport easy?
Ans: Wheel
9. Motion in which the distance from the axis remain same?
Ans: Circular motion
10. To and fro motion of a body about a fix point is example of what type of motion?
Ans: Oscillatory
11. What is motion?
Ans: The change in the position of an object with time is called motion.
12. What is the S.I unit of length?
Ans: The S.I unit of length is metre which is written as 'm'.
13. What is measurement?
Ans: The comparison of an unknown quantity with a standard known quantity is known as measurement.
14. What is unit?
Ans: A quantity adopted as a standard of measurements of a physical quantity is called a unit.
15. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and on the other end is 33.1 cm. What is the length of needle?
Ans: The length of the needle = (33.1-3.0) cm = 30.1 cm
6th Science:Measuring distance and motion : Questions Answer
Measurement and Motion :Quest Time
|
Answer the following question in one word
1. Name one object that shows multiple motions?
Ans: The Earth - Rotatory and translator motion
Drilling - Rotatory and downward translator motion
A ball moving along the ground- Rotatory and Rectilinear motion
2. How will you measure length in SI system?
Ans: Using meter scale
3. What is the quantity that can be measured?
Ans: Physical quantity like mass, length and Time
4. What type of motion body moves as a whole?
Ans: Translatory motion
5.Which kind of motion produce sound?
Ans: Vibratory motion
6. What types of motion is noticed in the pendulum of clock and swing?
Ans: Oscillatory motion and periodic
7. Falling of apple from tree is what types of motion?
Ans: Rectilinear motion.
8. Discovery of what made transport easy?
Ans: Wheel
9. Motion in which the distance from the axis remain same?
Ans: Circular motion
10. To and fro motion of a body about a fix point is example of what type of motion?
Ans: Oscillatory
11. What is motion?
Ans: The change in the position of an object with time is called motion.
12. What is the S.I unit of length?
Ans: The S.I unit of length is metre which is written as 'm'.
13. What is measurement?
Ans: The comparison of an unknown quantity with a standard known quantity is known as measurement.
14. What is unit?
Ans: A quantity adopted as a standard of measurements of a physical quantity is called a unit.
15. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and on the other end is 33.1 cm. What is the length of needle?
Ans: The length of the needle = (33.1-3.0) cm = 30.1 cm
================================
VI(6th)Science:Motion and Measurement of Distances : NCERT/CBSE
Answer the following question in brief
1. Give two example of periodic motion?
Ans: Motion of swing, Motion of pendulum, Motion of the earth around the sun
2. Shamvavi height is is 1.75m .Expess in cm and mm?
Ans: Shamvavi height is is 1.75m =1.75x100cm=175cm =175x10mm=1750mm
3. The length of table is 4270mm.Express in cm and m
Ans: 10mm =1cm Þ4270 m m = 4270/10=427cm
100cm = 1m Þ427cm =427/100m =0.427m
4. Why does foot step not used in standard unit of length?
Ans: it is because foot step vary from person to person
5. While measuring the length of paper clip, the reading of the scale at one end is 1.0 cm and on the other end is 4.7 cm. What is the length of paper clip?
Ans: The length of the needle = (4.7- 1.0) cm = 3.7 cm
6. The distance between main gate of red fort and india gate is 4279m .Express in km?
Ans: 1000m = 1km Þ4279/1000 km=4.279km
7. Arrange the following length in increasing order ; 1km;1mm;1cm;1m
Ans: length in increasing order 1mm < 1cm < 1m < km
8. Roll a ball on ground. Identify the types of motion?
Ans: A rolling ball moves in straight line on ground is combination of Rectilinear and rotatory motion.
9. Classify the following into different types of motion:
a) The motion of man on a straight road. b) The motion of wheels of a car .
c) The motion of a falling stone.
Ans: a) rectilinear motion. b) circular motion. c) rectilinear motion.
10. Give an example for following types of motion:
1. Linear Motion. 2. Circular Motion. 3. Rotatory Motion.
Ans: 1. A moving carin a straight line is an example of a linear motion.
2. Motion of blades of fan is an example of circular motion.
3. Rotation of earth on its axis is an example of rotatory motion.
Answer the following question in detail
1. Discuss significance of measurement?
Ans: measurement helps us to compare unknown quantity with known quantity. Measurement helps us make quantitative statements about something like how big, how long, how fast .
2. What are the different means of transport on land, air and water?
Ans: The different means of transport on land are : train, Bus, Car,
The different means of transport in air are : Aero planes , Gliders, Space ship
The different means of transport on water are : Ships, Boats
3. What is the need of standard unit for measurements?
Ans: For uniformity all over the world we need standard unit for measurements.
4. What is multiple motions. Explain?
Ans: The motion of a body some time may be combination of two or more types of motion called multiple motion. For example : Motion of earth around sun is Translatory motion where as Motion of earth on its axis is rotatory motion.
5.How can you measure length of a curved line?
(a) First of all we have to take a thread
(b) Now move the thread along the path of the curved surface
(c) Mark the thread at the end point up to which you want to measure the length
(d) Place the thread on the scale starting from zero to the marked end point.
(e) Measure this length by the help of the scale
===========================
HOT QUESTIONS
Describe at least three rules of measuring length correctly.
Ans: a. The scale that you are using to measure the object must be greater than the length of the object.
b. The eye should be placed just above the points that you are reading otherwise there will be error due to parallax.
c. If the zero mark of the scale is damaged or edge of scale is not smooth, then startmeasuring from another mark.
2. Name two devices used to measure length.
Ans: The two devices that can be used to measure length are:- Metre scale ad Screw gauge.
3. Describe the correct method of measurement of length.
Ans: (i) we must choose a suitable device for measuring the length of an object, like measuring scale
(ii) we should place the scale in contact with an object along its length and align the zeromark of the scale with the starting position of the object.
(iii) While taking the reading, eye must be placed vertically above the point where the measurements have to be taken; otherwise there will be an error in the reading which is taken due to parallex.
(iv) if the zero mark on the scale is damaged, then start the measurement from another mark.
4. Circle odd one
(a)Table; fan; falling stone; Parked car
(b)Bee ; butterfly; Grazing Cow; Sleepy Donkey
(c)Pendulum; Earth revolving around the Sun; Moon revolving around the earth; Bee revolving on flowers
(d)Moving fan; merry go round; A bus moving on road; a stone moving along circular track
Ans: (a) falling stone (b) Sleepy Donkey (c) Bee revolving on flowers (d) A bus moving on road
5.Fill in the blanks
1.One meter is --------------cm
2.one centimeter is -----------------mm
3. Four km is ---------m
4. The motion of moving bicycle is ----------------
5. The motion of drill machine is ----------
6. Motion of child on swing -------------
7. The motion of a top is ----------
Ans: 1. 100 2. 10 3. 4000 4. Rectilinear 5. rotatory 6. oscillatory
7. rotatory
6. Say true or false
(a)Rectilinear and curvilinear cannot happen at the same time
(b)Rupa can move in rectilinear and rotationary motion at the same time
(c)A child on swing has only circular motion
(d) Periodic motion is always rectilinear
(e) A foot step is used as a standard unit of length.
Ans: (a)False (b)True (c) False (d) False (e)False
Hots questions:
1. Can an object be in motion and rest simultaneously for different observer? Give an example and consequence?
Ans: Yes. A person driving a car is in rest with respect to other person in car but in motion with respect to a person standing road side. Tate of motion and rest depend on the observer or a fix point called reference point.
2. Can a body be in translational and rotational motion? Give some examples
Ans: yes, combination of translation and rotation is rolling motion like the motion of the wheel , the motion of the earth, drilling.
3. Why do we need standard unit of measurements for a quantity?
Ans: The unit used like hand span ,foot, cubit differ from person to person or even in different countries so for a uniform measurement we need standard unit of measurements.
4. Is it correct to say all periodic motion are oscillatory motion and all oscillatory motion are periodic. Give reason for answer?
Ans: In oscillatory motion body repeat its action in equal interval of time so, all periodic motion are oscillatory motion and vice versa. For example motion of swing, pendulum, motion of earth on its axis.
======================================
NCERT Class VI Science textbook:
Lesson 11: Light, Shadows And Reflections.What is the reason for the formation of shadow?
Ans: The rectilinear propagation of light .Kinds of shadow depends on the source f light.
(a)Point source of light form only dark and sharp shadow called the Umbra
(b)Extended source of light (smaller than object) form two reason a dark umbra and another less dark region called penumbra.
(c)Extended source of light (larger than object) : The size of umbra decreases and penumbra increases as screen move away from object and vice versa.
How can you see the thing around yourself?
Ans: We see the thing around us when light from a luminous object (like the Sun, a torch or an electric light) falls on these objects and then travels towards our eye after refection.
How can you determine the length of the shadow of an object?
Ans: We cannot correctly determine the length of the shadow of an object. The length of shadow depends on the angle at which light fall on a body and varies at different time of day. This principal helps us to make sun dial for calculating time.
How can you make sundial at home?
Ans: We take a pencil and place it into the whole of the empty spool of thread.This work as simple sundial.
Making the Sundial:1. Using the pencil, poke a hole on the side of the paper / Styrofoam cup pproximately 2 inches below its top (rim).
2. Place the pebbles in the cup so to give it some weight and hold it upright.3. Cover the cup with the plastic lid.
4. Put the straw through the hole on the side of the cup and its lid while letting about half an inch of the straw stick out from the side.
4. Secure the straw to the cup by taping it down on the side.
How do you make a pinhole camera?
Ans: Take two rectangular boxes that fit into one another without leaving any gap.
Cut open one side of each box.
Make a small hole in the larger box at the centre of the closed end opposite the side that has been cut open.
Cut a square of side five centimetres in the smaller box in the closed end opposite the side that has been cut open. Cover this square with tracing paper.
Finally, slide the smaller box into the larger box, ensuring that the pinhole and the tracing paper are in line with one another, but at the opposite ends.
Slide the smaller box to adjust the focus so that you can capture the image of any object you want.
Look through the open face of the smaller box. you can see the image of the object and inverted on the screen.
Lesson 11: Light, Shadows And Reflections.What is the reason for the formation of shadow?
Ans: The rectilinear propagation of light .Kinds of shadow depends on the source f light.
(a)Point source of light form only dark and sharp shadow called the Umbra
(b)Extended source of light (smaller than object) form two reason a dark umbra and another less dark region called penumbra.
(c)Extended source of light (larger than object) : The size of umbra decreases and penumbra increases as screen move away from object and vice versa.
How can you see the thing around yourself?
Ans: We see the thing around us when light from a luminous object (like the Sun, a torch or an electric light) falls on these objects and then travels towards our eye after refection.
How can you determine the length of the shadow of an object?
Ans: We cannot correctly determine the length of the shadow of an object. The length of shadow depends on the angle at which light fall on a body and varies at different time of day. This principal helps us to make sun dial for calculating time.
How can you make sundial at home?
Ans: We take a pencil and place it into the whole of the empty spool of thread.This work as simple sundial.
Making the Sundial:1. Using the pencil, poke a hole on the side of the paper / Styrofoam cup pproximately 2 inches below its top (rim).
2. Place the pebbles in the cup so to give it some weight and hold it upright.3. Cover the cup with the plastic lid.
4. Put the straw through the hole on the side of the cup and its lid while letting about half an inch of the straw stick out from the side.
4. Secure the straw to the cup by taping it down on the side.
How do you make a pinhole camera?
Ans: Take two rectangular boxes that fit into one another without leaving any gap.
Cut open one side of each box.
Make a small hole in the larger box at the centre of the closed end opposite the side that has been cut open.
Cut a square of side five centimetres in the smaller box in the closed end opposite the side that has been cut open. Cover this square with tracing paper.
Finally, slide the smaller box into the larger box, ensuring that the pinhole and the tracing paper are in line with one another, but at the opposite ends.
Slide the smaller box to adjust the focus so that you can capture the image of any object you want.
Look through the open face of the smaller box. you can see the image of the object and inverted on the screen.
======================================
CBSE Class 6th Light Shadow and Reflections
Answer the following in one word
1. Light is form of what?
Ans: Energy
2.What is the speed of light?
Ans: 3 x10 8 m/s
3. Name the dark part of shadow?
Ans: Umbra
4.What is lighter part of shadow known as?
Ans: Penumbra
5. Are stars luminous or non luminous?
Ans: Luminous _Objects that give out or emit light of their own are called luminous objectslike the sun
6. Do shadow depends on colour of objects?
Ans: No
7. Which types of object allow light to pass partially?
Ans: Translucent
Answer the following in detail
8.What are transparent, translucent and Opaque objects. Give at least two example of each?
Ans: If we cannot see through an object we call it Opaque like wood, plastic. Opaque object cannot allow
light to pass through. If we can see through an object we call it transparent like glass, water and air .
Transparent objects allow light to pass through . If we can see through an object but not very clearly we call it translucent like milk, wax paper, ground glass .
9. Why shadow of object like aero plane or bird cannot visible on Earth?
1. Light is form of what?
Ans: Energy
2.What is the speed of light?
Ans: 3 x10 8 m/s
3. Name the dark part of shadow?
Ans: Umbra
4.What is lighter part of shadow known as?
Ans: Penumbra
5. Are stars luminous or non luminous?
Ans: Luminous _Objects that give out or emit light of their own are called luminous objectslike the sun
6. Do shadow depends on colour of objects?
Ans: No
7. Which types of object allow light to pass partially?
Ans: Translucent
Answer the following in detail
8.What are transparent, translucent and Opaque objects. Give at least two example of each?
Ans: If we cannot see through an object we call it Opaque like wood, plastic. Opaque object cannot allow
light to pass through. If we can see through an object we call it transparent like glass, water and air .
Transparent objects allow light to pass through . If we can see through an object but not very clearly we call it translucent like milk, wax paper, ground glass .
Translucent objects allow light to pass partially through.
9. Why shadow of object like aero plane or bird cannot visible on Earth?
Ans: It is because umbra region cannot able to reach earth and finish above the earth.
10. What is shadow .What are condition essential for the formation of shadow?
Ans: The dark patch that formed when opaque object come in the path of light is called shadow.
Condition essential for the formation of shadow are:
(a)Source of light (b) Opaque object (c) Screen on which shadow form
LIGHT , SHADOWS AND REFLECTIONS Hots Questions
1. In a completely dark room, can you see your face in a mirror? Why?
Ans: Due to absence of light In a dark room. Light is the source that illuminates our face by reflection.
2. Why cannot we see upside down image of the sun?
Ans: Object like sun is in infinity whose image form point sized or highly demised.
3. Why shadows are black in colour?
Ans: It is because no light reaches on screen in area where shadow form. The colour of object is colour components of light that reflect and reach our eyes.
4. Can you see an object through a “T” shaper pipe? If, no, Why?
Ans: No, it is because light always travel in straight path that is known as rectilinear properties of light.
5. Can you see a reflected light directly? If, no Why?
Ans No, the path of the ray of light is itself invisible but make the things visible only when fall on our eyes.
======================================================
Class 6 Getting To Know Plants mcq and NCERT Solution
VI Science: Getting to know Plants MCQ
1) The plants which have branches at the base are -----
a) Herbs b) Shrubs c) Creepers d) Trees
2) Which plant is the example of a herb?
a) Mango b) China rose c) Wheat d) None
3) A plant with weak stem is ----
a) Mint b) Sunflower c) Lemon d) China rose
4) The plant which takes the support of the neighboring structures and climbs up is
a) Tree b) Shrub c) Creeper d) Climber
5) The part of plant which grows above the ground is ----?
a) Shoot system b) Root system c) both a & b d) None
6) The part of the stem in between two successive nodes is ----?
a) Pistil b) Root c) Node d) Internodes
7) The root, stem leaves constitute the --- part of the plant body?
a) Vegetative b) Reproductive c) Both a & b d) None
8) Flowers, Fruits & Seeds constitute the ---- part of the plant body?
a) Vegetative b) Reproductive c )Both a & b d)None
9) The part of the plant which prevents soil erosion is?
a) Stem b) Flower c) Root d) Leaves
10) Banana has ------- roots.
a) Tap b) Lateral c) Fibrous d) None
11) Which of the following has tap root?
a) Wheat b) Mango c)Tulsi d) Both a & b
12) Shoot system develops from ----- of the baby plant or embryo?
a) Cotyledons b) Roots c) Callus d) plumule
13) Example of an incomplete flower is ----?
a)Pea b)China rose c) Date palm d)Mustard
14) When a flower has all the sets of whorls it is described as ------ flower.
a) Complete b) Incomplete c) Zygomorphic d) Actinomorphic
15) ------- bud helps in length wise growth of the plant.
a) Apical b) Axillary c) Both a & b d) None
16) Branches grow from - - - - - - - - -
a) Roots b) Apical Buds c) Axillary Buds d) Stem
17) The ----------------- is the strongest part in a tree.
a) Stem b) Root c) Trunk d) None
18) Which of the following is a stem?
a) Turnip b) Onion c) Radish d) Carrot
19) The region of attachment of the leaf with the stem is called the ----------------
a) Petiole b) Lamina c) Leaf margin d) Leaf Base
20) --------------- is a flowering plant with no leaves
a) Cuscuta b) Coleus c) Pistia d) Pea
21) Stomata help in -----------------
a) Respiration b) Photo Synthesis c) Transpiration d) All of the above
22) A plant with verigated leaves is --------------------
a) Pea b) Balsam c) Coleus d) Cuscuta
23) The food prepared by leaves is stored as -------------------
a) Starch b) Sugars c) Proteins d) Fats
24) The other name for ovary is--------.
a)Stamen b) Pistil c) Carpel d)Stigma
25) Pollen grains are produced in ------?
a)Flower b) Ovaries c) Anthers d) Fruits.
ANSWER KEY FOR GETTING TO KNOW PLANTS
(1) b (2)c (3)a (4)d (5)d
(6) a (7)b (8)c (9)c (10)d
(11)d (12)c (13)a (14)a (15)a
(16)c (17)c (18)b (19)d (20)a
(21)d (22)c (23)a (24)c (25)c
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CBSE VI:Science:Getting to Know Plants Quick Revision Notes
Class VI: Science: Getting to Know Plants
Herbs
1. A herb is a non-woody plant that has green and tender stems with few branches and is usually short
2. A herb is a non-woody plant that has green and tender stems with few branches and is usually short.
3. Herbs have a variety of uses including adding flavor to food, providing medicine for diseases and in some cases even adding a spiritual touch.
Shrubs
1.Shrubs are taller than herbs and have stems branching out from the base.
2. The stems of shrubs are hard not but thick.
3. A common place where shrubs are grown is known as shrubbery.
Tree
1.A tree is a woody plant that has many branches on a single stem.
2. Trees benefit us by preventing soil erosion, maintaining the carbon dioxide content in the air and in building huts and making furniture.
Creepers
1. Creepers have a tendency to develop new plants on their own.
2. A few creepers could cause allergies or skin problems if touched.
Climbers
1.Climbers are plants that need support from other structures to grow and spread.
2.Climbers can either move horizontally or vertically unlike creepers that move only horizontally.
3. Climbers attracts insects and reptiles because of their brightly coloured flowers and fragrance
Root hair: The tiny thread-like structures comes over the roots are the root hair. The tip of the root is called the root cap.
Roots are of two types - tap root and fibrous roots.
Tap root: A primary root that grows more or less straight down into the soil, and is tapered towards the end. This main root is called the tap root.
Lateral roots: There are many smaller roots that branch out from the tap root are called lateral roots. Examples of plants with tap roots are hibiscus, carrot, turnip and sunflower.
Fibrous roots: Many lateral roots that start from the base of the stem are called fibrous roots.Examples of plants with fibrous roots are banana, grass and onion.
The main functions of the roots:
1. Absorb water and nutrients from the soil
2. They store food like sugars and carbohydrates
3. The roots hold the plant firmly in the soil, thereby serving as an anchor to the plant.
The main functions of the Stem:
1. Holds the leaves, flowers and fruits
2. Transport water and nutrients
vascular tissue : The vascular tissue inside the stem helps to transport water and nutrients from the roots to the leaves, and food from the leaves to the roots.
Transpiration : Plants release excess water in the form of water vapour through minute openings in the leaves, called the stomata. This process is known as transpiration
The different parts of a flower: The flower is the reproductive part of a plant.
1.The green leaf-like parts surrounding the bud are called the sepals. They protect the bud before it blooms into a flower. The sepals are collectively called the calyx.
2.The brightly coloured parts of a flower are called the petals. It helps plant to attract insects and birds for pollination
3. The male part of a flower is called the stamen, and the female part is called the pistil.
4. The sepals are collectively called the calyx.
5. The petals are collectively called the corolla.
6. In some flowers, the petals and sepals combine to form a round shape, which is called the tepal.
Fertilization: The male and female parts of a flower are involved in the formation of fruit in a process called fertilization.
The male reproductive part of a flower: The stamen is the male reproductive part of a flower.
1. The small tube with a little bulge at the end of a stamen is called the filament.
2. The filament has a yellow sac called the anther.
3. This yellow sac contains pollen grains, which contain male reproductive cells.
The female reproductive part of a flower : Pistil consists of three parts - the stigma, the style and the ovary.
1. The upper end of the pistil is called the stigma, where pollen grains get deposited and enter the pistil.
2. The narrow tubular part is called the style, which connects the stigma to the lower part of the pistil.
3. The lower bulgy part of the pistil is called the ovary. It contains ovules.
4. The female reproductive cells are ovules
Herbs
1. A herb is a non-woody plant that has green and tender stems with few branches and is usually short
2. A herb is a non-woody plant that has green and tender stems with few branches and is usually short.
3. Herbs have a variety of uses including adding flavor to food, providing medicine for diseases and in some cases even adding a spiritual touch.
Shrubs
1.Shrubs are taller than herbs and have stems branching out from the base.
2. The stems of shrubs are hard not but thick.
3. A common place where shrubs are grown is known as shrubbery.
Tree
1.A tree is a woody plant that has many branches on a single stem.
2. Trees benefit us by preventing soil erosion, maintaining the carbon dioxide content in the air and in building huts and making furniture.
Creepers
1. Creepers have a tendency to develop new plants on their own.
2. A few creepers could cause allergies or skin problems if touched.
Climbers
1.Climbers are plants that need support from other structures to grow and spread.
2.Climbers can either move horizontally or vertically unlike creepers that move only horizontally.
3. Climbers attracts insects and reptiles because of their brightly coloured flowers and fragrance
Root hair: The tiny thread-like structures comes over the roots are the root hair. The tip of the root is called the root cap.
Roots are of two types - tap root and fibrous roots.
Tap root: A primary root that grows more or less straight down into the soil, and is tapered towards the end. This main root is called the tap root.
Lateral roots: There are many smaller roots that branch out from the tap root are called lateral roots. Examples of plants with tap roots are hibiscus, carrot, turnip and sunflower.
Fibrous roots: Many lateral roots that start from the base of the stem are called fibrous roots.Examples of plants with fibrous roots are banana, grass and onion.
The main functions of the roots:
1. Absorb water and nutrients from the soil
2. They store food like sugars and carbohydrates
3. The roots hold the plant firmly in the soil, thereby serving as an anchor to the plant.
The main functions of the Stem:
1. Holds the leaves, flowers and fruits
2. Transport water and nutrients
vascular tissue : The vascular tissue inside the stem helps to transport water and nutrients from the roots to the leaves, and food from the leaves to the roots.
Transpiration : Plants release excess water in the form of water vapour through minute openings in the leaves, called the stomata. This process is known as transpiration
The different parts of a flower: The flower is the reproductive part of a plant.
1.The green leaf-like parts surrounding the bud are called the sepals. They protect the bud before it blooms into a flower. The sepals are collectively called the calyx.
2.The brightly coloured parts of a flower are called the petals. It helps plant to attract insects and birds for pollination
3. The male part of a flower is called the stamen, and the female part is called the pistil.
4. The sepals are collectively called the calyx.
5. The petals are collectively called the corolla.
6. In some flowers, the petals and sepals combine to form a round shape, which is called the tepal.
Fertilization: The male and female parts of a flower are involved in the formation of fruit in a process called fertilization.
The male reproductive part of a flower: The stamen is the male reproductive part of a flower.
1. The small tube with a little bulge at the end of a stamen is called the filament.
2. The filament has a yellow sac called the anther.
3. This yellow sac contains pollen grains, which contain male reproductive cells.
The female reproductive part of a flower : Pistil consists of three parts - the stigma, the style and the ovary.
1. The upper end of the pistil is called the stigma, where pollen grains get deposited and enter the pistil.
2. The narrow tubular part is called the style, which connects the stigma to the lower part of the pistil.
3. The lower bulgy part of the pistil is called the ovary. It contains ovules.
4. The female reproductive cells are ovules
Very Helpful. See Quiz on Components Of Food"
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