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Question A.1:

Rearing and management of fish on a large scale is known as
(a) apiculture
(b) pisciculture
(c) agriculture
(d) poultry

Answer:

(b) pisciculture

Pisciculture is the practice of rearing and management of fish on a large scale.

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Question A.2:

Which of the following is not an animal product?
(a) butter
(b) milk
(c) meat
(d) mustard

Answer:

(d) Mustard

Mustard is a plant product.

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Question A.3:

The fibre from the ramie plant is obtained from its
(a) stem
(b) root
(c) leaf
(d) flower

Answer:

(a) stem

The fibre from the ramie plant is obtained from its stem.

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Question A.4:

Which of the following materials float on the surface of water?
(a) sand
(b) nail
(c) petrol
(d) alcohol

Answer:

(c) Petrol

Petrol, being lighter than water, floats on the surface of water.

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Question A.5:

Vegetables and fruits are rich in
(a) minerals
(b) vitamins
(c) both of these
(d) none of these

Answer:

(c) both of these

Vegetables and fruits are great sources of both minerals and vitamins.

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Question B:

Fill in the blanks:
1. The rearing of honeybees on a large scale is called .......................... .
2. The white portion of an egg is called .......................... .
3. A special kind of plastic is made from .......................... fibre.
4. Placing of similar things together is called .......................... .
5. Deficiency of .......................... leads to goitre.

Answer:

1. The rearing of honeybees on a large scale is called apiculture.
2. The white portion of an egg is called egg white.
3. A special kind of plastic is made from hemp fibre.
4. Placing of similar things together is called classification.
5. Deficiency of iodine leads to goitre.

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Question C:

Match the columns:

Column A Column B
1. Lustre (a) Vitamin D
2. Linen (b) Green gram
3. Calciferol (c) Gold
4. Pulse (d) Fish
5. Pisciculture (e) Flax

Answer:

Column A Column B
1. Lustre (c) Gold
2. Linen (e) Flax
3. Calciferol (a) Vitamin D
4. Pulse (b) Green gram
5. Pisciculture (d) Fish

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Question D:

Write True (T) of False (F):
1. Animals which provide both meat and eggs are called poultry animals. ( )
2. Sugar and starch are two types of carbohydrates found in food. ( )
3. Fabric is made from yarn by weaving and knitting. ( )
4. Miscible liquids make a separate layer on the surface of other liquids. ( )
5. Linen is made from hemp fibre. ( )

Answer:

1. True (T)

2. True (T)

3. True (T)

4. False (F)

Immiscible liquids make a separate layer on the surface of other liquids.

5. False (F)

Linen is made from flax fibre.



Page No 51:

Question E:

Give two examples of each of the following:

1. Beverages ......................... .........................
2. Immiscible liquids ......................... .........................
3. Translucent materials ......................... .........................
4. Omnivores ......................... .........................
5. Minerals in food ......................... .........................
6. Synthetic fibres ......................... .........................
7. Plant fibres ......................... .........................
8. Lustrous materials ......................... .........................

Answer:

1. Beverages Lemonade Cold drink
2. Immiscible liquids Water and petrol Water and oil
3. Translucent materials Butter paper Polythene
4. Omnivores Humans Owl
5. Minerals in food Iron Calcium
6. Synthetic fibres Nylon Rayon
7. Plant fibres Cotton Jute
8. Lustrous materials Gold Silver

Page No 51:

Question F:

Name the parts of the plants from where the following are obtained.

1. Onion .........................
2. Spinach .........................
3. Cauliflower .........................
4. Clove .........................

Answer:

1. Onion Stem
2. Spinach Leaf
3. Cauliflower Flower
4. Clove Bud

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Question G.1:

Why are plants important to us?

Answer:

We depend on plants for our food requirements and for respiration. Therefore, plants are important to us.

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Question G.2:

Write the chemical name of Vitamin C.

Answer:

The chemical name of vitamin C is ascorbic acid.

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Question G.3:

Why do we weak dark coloured clothes in winter?

Answer:

We wear dark-coloured clothes in winter because they absorb more heat and prevent the heat in our body from escaping. Hence, our body gets warm more quickly.

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Question G.4:

Why is it essential to classify things?

Answer:

It is essential to classify things because classification makes the study of a huge number of objects of different kinds easier, systematic and convenient.

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Question H.1:

Why do the food requirements of different animals differ?

Answer:

The food requirements of different animals are different depending upon the type of food they consume. Herbivores feed on only plants and plant products, and thus they require food different from that of carnivores, which feed only on the flesh of other animals. Omnivores, however, can feed on both plants and animals.

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Question H.2:

Why do doctors advise against taking too much of fat?

Answer:

If we take too much fat, then it gets deposited in our body and leads to obesity, which can cause many heart-related and other diseases. Thus, doctors advise against taking too much fat.

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Question H.3:

Differentiate between fibres and fabrics.

Answer:

Fibres Fabrics
Fibres are strong and flexible threads that can be used for making clothes. Fabrics are made up of fibres. When fibres are woven together, they form a fabric.
Examples: Cotton fibre and jute fibre. Examples: Cotton fabric and jute fabric.

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Question H.4:

How will you determine the hardness of a given substance?

Answer:

The hardness of a given substance can be found out by pressing it with your hands. If the substance is difficult to compress, then it is a hard substance, such as stone.



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