Question

Write True or False :-

1. Animal fibres consist of mainly of keratin protein.

2. All the fibres need not to be processed before they are used.

3. Silk is the natural animal fibre.

4. Rearing silk worm on a commercial scale is sericulture.

5. Yarn is not the processed wool.

6. Wool is a good conductor of heat.

7. Silkworm feed on rose leaves.​

Answer 1

Answer:-

1.) Animal fibers consist of mainly of keratin protein:-

Ans:- True

Reason:- keratin is mainly found in vertebrates. Keratin is a fibrous structural protein found in animal cells and used to form specialized tissues.

2.) All the fibers need not to be processed before they are used.

Ans:- False

Reason:-Developing fibers with improved tensile properties is important because fiber breakage during processing from field to yarn can impart imperfections

3.) Silk is the natural animal fiber:-

Ans:- True

Reason:-Silk is obtained from silkworms, hence it can be said to be a natural animal fiber.

4.) Rearing silk worm on a commercial scale is sericulture:-

Ans:- True

Reason:-Sericulture, is the cultivation of silkworms to produce silk. Although there are several commercial species of silkworms.

5.)Yarn is not the processed wool.

Ans:- False

Reason:- The yarn is sent to process wool from the sheep to the fabric are: shearing, cleaning and scouring, grading and sorting, spinning, and many more.

6.)Wool is a good conductor of heat:-

Ans:- False

Reason:- Wool is a bad conductor of heat.

7.)Silkworm feed on rose leaves:-

Ans:- False

Reason:- Silkworms only feed from the leaves of mulberry trees.

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Answer 2

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(1) True

(2) False

(3) True

(4) True

(5) False

(6) False

(7) False

$\large{\bold{\underline{Explanation :}}}$

(1) Animal fibres consist of mainly of keratin protein. True

• The given statement is true because keratin is a type of protein which is present in the animal fibres.
• Majority of the animal fibres that we get from sheep ,camel rabbit etc. contain keratin.
• Fact: Keratin is the protein that constitutes our hair.

(2) All the fibres need not to be processed before they are used. False

• This statement is false because fibres like Coir can be used even without processing [though it is not used for clothing].
• In some cases even jute need not be processed.

(3) Silk is the natural animal fibre. True

• This statement is True because Silk is a product of an insect called Silk worm.
• Fact: Culitvation of silk worms for commercial purpose is known as sericulture.

(4) Rearing silk worm on a commercial scale is sericulture. True

• This statement is True because Sericulture is a highly growing economic industry with increasing job opportunities and need of silk.

(5) Yarn is not the processed wool. False

• This statement is false because, yarn is a fabric which is made from cotton. Cotton is made from various ways like shearing etc.
• It requires various steps. Hence, It is a processed wool.

(6) Wool is a good conductor of heat. False

• This statement is false because Wool is an insulator of heat.
• Due to this property, wool absorbs the body heat in its air pockets and keeps us warm during winter.

(7) Silkworm feed on rose leaves. False

• This statement is false because Silkworm feed on Mulberry leaves not Rose leaves.