STD-3, CHAPTER-6: FEEDING HABITS OF ANIMALS, EXERCISE QUESTION ANSWERS

 A.     FILL IN THE BLANKS.

1.      Snakes ________ their prey.

Ans: Swallow

2.      Giraffe feeds on ­­­_______ only.

Ans: plants

3.      Frog has a _______ tongue.

Ans: sticky

4.      Buffaloes ________ their food first and then chew it.

Ans: nibble

5.      Butterfly _______ its food.

Ans: sucks

6.      Squirrel has sharp front _______ like teeth.

Ans: chisel

B.      MATCH THE FOLLOWING:

1.      snake                                  a. sugarcane

2.      monkey                              b. frog

3.      lion                                     c. banana

4.      elephant                            d. deer

      Ans:

1.      snake                               b. frog

2.      monkey                           c. banana

3.      lion                                  d. Deer

4.      elephant                         a. sugarcane

 

C.      TICK THE CORRECT OPTION.

 

1.      The animal, that eats both plants and animals, is the -

(a)   tiger        (b) cow          (c) rat        (d) horse

      Ans: rat

2.      Dog tears the flesh with –

(a)   Chisel teeth          (b) grinding teeth         (c) pointed teeth          (d) tube

      Ans: pointed teeth

3.      Poultry birds should be fed with–

(a)   Green grass       (b)  fresh fruits       (c) milk       (d) grains

       Ans: grains

4.      It is a herbivorous animal–

(b)   fox          (b) cow        (c) rat          (d) snake

      Ans: cow

D.     ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

 

1.      What are carnivorous animals?

Ans: Flesh eating animals are called carnivorous animals.

2.      Name the kind of teeth that help a cow to chew the grass.

Ans: Strong and broad back teeth, help a cow to chew the grass.

3.      Name two animals which gnaw their food.

Ans: Two animals which gnaw their food are, rabbit and rat.

4.      Name the type of teeth that squirrels have. Name two more animals having the same type of teeth.

Ans: Squirrels have sharp pointed chisel like teeth. Two more animals having the same type of teeth are, rabbit and rat.

E.      ANSWER THE FOLLOWING QUESTIONS.

 

1.      State one difference between herbivorous and omnivorous animals. Give one example of each type.

Ans: i) Herbivorous animals only eat plant products. Omnivorous animals eat both plant and animal products.

ii) Cow is a herbivorous animal and dog is an omnivorous animal.

2.      How does a lizard take its food?

Ans: i) A lizard catches its prey with the help of its sticky tongue.

ii) Lizards swallow their food without biting ir chewing the food.

3.      Explain the term ‘chewing the cud’?

Ans: i) Grass eating animals first nibble their food and put it inside their bodies.

ii) When they relax, they bring back part of the food into their mouths and then chew it properly. This is called ‘chewing the cud’.

4.      Write any two ways that can help us in taking care of domestic animals.

Ans: Two ways that can help us in taking care of domestic animals are as follows,

i) Poultry birds, like hen and duck, should be fed with grains and water.

ii) The shelter of all domestic animals should be clean, dry, and airy.

5.      How do butterfly and mosquito have their food?

Ans: Butterfly and mosquitoes, have a long hollow tube like structure. This helps them to suck their food.

STD-4: CHAPTER-7: FOOD, EXERCISE QUESTION ANSWERS

 A.     FILL IN THE BLANKS.

1.      Carbohydrates and fats are the nutrients which provide _______ to our body.

Ans: energy

2.      Foodstuffs, containing _______, are called body building foods.

Ans: proteins

3.      _______ and _______ are the sources of Vitamin C.

Ans: Orange and lemon

4.      We can get ________ from iodised table salt.

Ans: iodine

5.      The roughage in our diet, helps the body to get rid of_______ food.

Ans: undigested

B.      WRITE TRUE OR FALSE FOR THE FOLLOWING STATEMENTS:

1.      All nutrients are important for our body.                                                                            True

2.      Our food should include more than one source of protein.                                            True

3.      Our body needs Vitamin C for healthy bones and teeth.                                                 False

4.      A balanced diet need not contain all the nutrients.                                                          False

5.      Old People, who are not very active, should eat more of fats and carbohydrates.   False

 

C.      TICK THE CORRECT OPTION.

 

1.      Calcium, Iron and Phosphorus are examples of-

(a)   Minerals        (b) Vitamins          (c)  Proteins       (d) Carbohydrates

      Ans: Minerals

2.      Protective foods are needed by our body for –

(a)   energy       (b) warmth           (c) health           (d) growth

      Ans: health

3.      A person, doing a lot of physical work, needs more of –

(a)   vitamins       (b)  minerals       (c) proteins       (d) carbohydrates

       Ans: carbohydrates

4.      Sugar contains mainly–

(a)   Carbohydrates       (b)  vitamins       (c) minerals       (d) fats

       Ans: carbohydrates

5.      The vitamin, that helps us to have good eye-sight, is Vitamin–

(a)   A       (b) B           (c) C           (d) D

      Ans: Vitamin A

D.     ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

1.      Name the nutrients present in energy giving foods.

Ans: Energy giving foods contain fats and carbohydrates in them.

2.      State the main role of proteins for our body.

Ans: Proteins help our body to grow and repair the worn-out tissues.

3.      Name two food items, obtained from animals, that are good sources of proteins.

Ans: Milk and eggs, that are obtained from animals, are good sources of proteins.

4.      Name two minerals that are required for healthy bones and teeth. Also mention one food source that contains both of them.

Ans: Calcium and Phosphorus are required for healthy bones and teeth. Milk contains both calcium and phosphorus.

5.      Why are vitamins and minerals called ‘protective foods’?

Ans: Vitamins and minerals, protect our body from diseases and keep us healthy. So, foodstuffs containing vitamins and minerals are called protective foods.

E.      ANSWER THE FOLLOWING QUESTIONS.

1.      What are nutrients? Why are they necessary for our body?

Ans: i) Nutrients are substances, present in the food.

ii) They provide us energy, help us to grow, keep us healthy, disease free and strong. So, nutrients are necessary for our body.

2.      Why should we eat a balanced diet?

Ans: i) All nutrients are not available in any one food item.

ii) Absence of any one nutrient from our diet, over the years, can affect our growth and proper functioning of the body.

iii) A balanced diet contains all the nutrients, roughage and water in appropriate amounts.

So, we should eat a balanced diet.

3.      Why is it advisable to eat food items like whole fruits, salads and whole grains?

Ans: : i) Whole fruits, salads and whole grains contain fibres or roughage.

ii) These fibres helps our body to get rid of undigested food.

iii) Fibres also help us to avoid over-eating.

So, it is advisable to eat food items like whole fruits, salads and whole grains to get fibres.

4.      Why do we say that water is essential for proper functioning of our body?

Ans: i) Water helps in digestion of food and absorption of nutrients in our body.

ii) It also helps in throwing out wastes from the body.

Thus, water is essential for our body to function properly.

5.      ‘Old people need less of proteins, carbohydrates and fats than young children.’ Justify this statement.

Ans: i) Young children are very active, as they do a lot of work. They require more energy and strength. So, they need more proteins, carbohydrates and fats.

ii) But, old people are not very active. They need less energy. So, they need less carbohydrates, fats and proteins.

STD-5: CHAPTER-8- PROPERTIES OF WATER, EXERCISE QUESTION AND ANSWERS

 A.     FILL IN THE BLANKS.

1.      A substance which dissolves completely in a liquid is said to be ________ in it.

Ans: soluble

2.      The substance, that dissolves in a medium to form a solution, is known as the ______.

Ans: solute

3.       Mustard oil is _________ in water.

Ans: insoluble

4.       Aquatic animals breathe the _______ gas dissolved in water.

Ans: oxygen

5.      Change of a liquid into its vapour form is called ________.

Ans: evaporation

6.      Condensation is the process of change of vapours into _______.

Ans: liquid

B.      WRITE TRUE OR FALSE FOR THE FOLLOWING STATEMENTS.

 

1.      Sugar and salt are soluble in water.                                                                                True

2.      Hair oil is insoluble in water.                                                                                            True

3.      Pebbles float on water.                                                                                                      False

4.      Sand sinks in water.                                                                                                            True

5.      Water vapours can be changed into liquid water by heating.                                   False

 

C.      TICK THE CORRECT OPTION.

 

1.      In a solution of sugar and water -

(a)   Water is the solute                

(b)   Sugar is the solvent        

(c)    Both water and sugar are solutes           

(d)   Water is the solvent

      Ans: Water is the solvent

2.      When sand is mixed with water, it-

(a)   Dissolves and floats on water        

(b)   Does not dissolve but floats on water          

(c)    Does not dissolve but sinks in water         

(d)   Dissolves and sinks in water

      Ans: does not dissolve but sinks in water

3.      Wet clothes get dried due to-

(a)   Water cycle       (b) evaporation        (c) respiration       (d) condensation

       Ans: evaporation

4.      Mixture of sugar, salt and lemon juice in water is a-

(a)   solution                (b) solvent

(c)    solute                    (d) floating mixture

      Ans: solution

D.     ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

 

1.      Define a solution.

Ans: When a substance (solute) dissolves completely in any medium (solvent), we get a solution.

2.      What is a solvent?

Ans: The medium, in which the substance (solute) is dissolved, is called a solvent.

3.      Name two substances that are soluble in water.

Ans: Sugar and salt are soluble in water

4.      Name two substances that are insoluble in water.

Ans: Pebbles, saw dust are insoluble in water.

5.      Write the names of four substances that float on water.

Ans: Cork, Butter paper, hair oil, mustard oil float on water.

6.      Name the three forms of water.

Ans: The three forms of water are liquid, solid and vapour form.

E.      ANSWER THE FOLLOWING QUESTIONS.

 

1.      Give two examples each of:

(a)   Liquids which dissolve in water

(b)   Liquids which are insoluble in water.

(c)    Solids which float on water.

(d)   Solids which sink in water

Ans: a) lemon juice and vinegar are the liquids which dissolve in water.

b) hair oil, kerosene are the liquids which are insoluble in water.

c) cork and saw dust are the solids which float on water.

d) pebbles and coins are the solids which sink in water.

2.      What do we understand by the terms ‘evaporation’ and ‘condensation’?

Ans: i) Change of a liquid into its vapour form is called Evaporation.

ii) Change of vapour form of a substance into its liquid form, on cooling, is called condensation.

3.      How are clouds formed?

Ans: i) Due to evaporation, the water from different water bodies, rises up in the form of water vapour.

ii) As these go very high, they get cooled and condense to form tiny droplets of liquid water.

In this way, clouds are formed.

4.      How does rain water get impure?

Ans: i) Raindrops, when just formed, are the purest form of water.

ii) By the time, rain water reach the surface of the earth, they dissolve many harmful gases present in air and also get dust and smoke mixed up with them.

Thus, it becomes impure.