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.

STD 5: CHAPTER 7: IMPORTANCE OF WATER, EXERCISE QUESTION AND ANSWERS

 

A.     FILL IN THE BLANKS.

1.      Water helps in _______ of food in animals.

Ans: digestion

2.      Animals living in water are called _________.

Ans: aquatic animals

3.       Animals which can live both in water and on land, are called _________.

Ans: amphibious animals

4.       Water, trapped between underground rocks, is called ________.

Ans: ground water

5.      ______ and ______ are aquatic plants.

Ans: duckweed and lotus

B.      WRITE TRUE OR FALSE FOR THE FOLLOWING STATEMENTS.

 

1.      Water is required for germination of seeds.                                                                 True

2.      Ground water can be drawn up by a hand pump.                                                       True

3.      About 50% of water is present in seas and oceans.                                                    False

4.      Octopus is an amphibious animal.                                                                                  False

5.      River water is purified for drinking purpose.                                                                True

 

C.      TICK THE CORRECT OPTION.

 

1.      About 97% of water is present in -

(a)   Seas and oceans                (b) lakes         (c) ponds           (d) glaciers

      Ans: seas and oceans

2.      Plants absorb water from the soil with the help of -

(a)   stem         (b) leaves         (c) branches         (d) roots

      Ans: roots

3.      A rehat is used for-

(a)   Supplying water through taps.

(b)   Purifying river water          

(c)    Drawing out ground water for irrigation      

(d)   Absorbing water from the soil

       Ans: drawing out ground water for irrigation

4.      An example of an amphibious animal is-

(a)   fish                           (b) frog

(c)    hydrilla                    (d) duckweed

      Ans: frog

D.     ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

 

1.      Name any two water bodies that exist on the surface of earth.

Ans: Seas and oceans are the water bodies that exist on the surface of earth.

2.      What are animals living in water known as? Write names of two such animals.

Ans: The animals living in water are known as aquatic animals. Examples are, fish and octopus.

3.      What are amphibious animals?

Ans: Animals, which can live both in water and on land, are called as amphibious animals.

4.      Write names of four aquatic plants.

Ans: Four aquatic plants are, water lily, duckweed, lotus and water hyacinth.

5.      How do plants absorb water from the soil?

Ans: The plants absorb water from the soil with the help of their roots.

6.      State two common methods of drawing out ground water.

Ans: Two common methods of drawing out ground water are using a rehat or a pulley.

E.      ANSWER THE FOLLOWING QUESTIONS.

 

1.      Besides its domestic use, state three other uses of water.

Ans: Besides its domestic use, water is also used for, i) irrigating the fields,

                                                                                                 ii) generating electricity and  

                                                                                                 iii) transportation

2.      How does water help in excretion of waste material from animal bodies?

Ans: i) The animal body produces waste materials.

ii) These waste materials get dissolved in water and are excreted in the form of urine or sweat.

3.      List any four ways in which water is important for plants.

Ans: i) Water provides nutrients to plants in dissolved form.

ii) Water also helps in transporting nutrients to various parts of the plant.

iii) Plants require water for photosynthesis process.

iv) Plants require water for germination of seeds.

4.      How can ground water be drawn out through tubewells?

Ans: i) In a tubewell, a long pipe is inserted deep into the ground where it dips below the ground water level.

ii) Water is then drawn up by using a hand pump or an electric pump.

5.      What is a stepwell?

Ans: i) A stepwell is a well having steps on all sides.

ii) This enables people to go down to fetch water.

6.      How is water supplied in cities?

Ans: i) There are well-planned water supply systems that supply water to homes and offices in the cities.

ii) In such systems, the river water is usually purified by a series of processes that make it fir for drinking.

iii) This purified water is then sent to homes and offices through a network of pumps and pipes.