NCERT Class VII Science Solution: Chapter 3-Fibre to Fabric Part 2

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Question 8:

The term sericulture is used for

  1. Culture of bacteria.

  2. Rearing of silkworm.

  3. Making silk fabric from silk yarn.

  4. Production of sarees.

Answer: B

Question 9:

Reeling of silk is

  1. A process of making silk reels.

  2. Spinning of silk fibres.

  3. Weaving of silk cloth.

  4. The process of taking silk threads from cocoon.

Answer: D

Question 10:

Silkworms secrete fibre made of

  1. Fat

  2. Cellulose

  3. Protein

  4. Nylon

Answer: C

Image of Silkworm

Image of Silkworm

Image of Silkworm

VERY SHORT ANSWER QUESTIONS

Question 11:

Fill in the blanks in the following statements.

  1. ________and ________ fibres arc obtained from animals.

  2. Silk fibres come from ________ of silk _________.

  3. Wool yielding animals bear _______ on their body.

  4. Hair trap a lot of_______, which is a poor ________ of heat.

Answer:

  1. Silk and wool fibres arc obtained from animals.

  2. Silk fibres come from cocoons of silk moth.

  3. Wool yielding animals bear hair on their body.

  4. Hair trap a lot of air, which is a poor conductor of heat.

Question 12:

State whether the following statements arc True or False. If false, correct them.

  1. Silkworms arc caterpillars of silk moth.

  2. In India, camels and goats are generally reared for obtaining wool.

  3. The rearing of silkworms for obtaining silk is called Silviculture.

  4. In the process of obtaining wool from fleece, sorting is done after scouring.

  5. Yak hair arc not used to make woolen fabric.

Answer:

  1. Silkworms arc caterpillars of silk moth. (True)

  2. In India, camels and goats are generally reared for obtaining wool. (False)

    True Answer:

    Generally sheep are reared.

  3. The rearing of silkworms for obtaining silk is called Silviculture. (False)

    True Answer:

    It is sericulture.

  4. In the process of obtaining wool from fleece, sorting is done after scouring. (True)

  5. Yak hair arc not used to make woolen fabric. (False)

    True Answer:

    Used to make woolen fabric.

Question 13:

How do the hair of certain animals help in keeping their bodies warm?

Answer:

Hair traps a lot of air, which is a poor conductor of heat.