NCERT Solutions for Class 7 Science Chapter 3

Fibre to Fabric

NCERT Solutions for Class 7 Science Chapter 3 Exercise Question

Question 1

You must be familiar with the following nursery rhymes:

(i) ‘Baa baa black sheep, have you any wool.’

(ii) ‘Mary had a little lamb, whose fleece was white as snow.’

Answer the following:

(a) Which parts of the black sheep have wool?

(b) What is meant by the white fleece of the lamb?

Answer

a) Wool obtained from hair called fleece of the sheep.

b) It refers to the white colour of their hairy skin.

Question 2

The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.

(i) a (ii) b (iii) both a and b (iv) neither a nor b.

Answer

(iii) both a and b

Question 3

Which of the following does not yield wool?

(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog

Answer

The answer is (iv) Woolly dog

Question 4

.What is meant by the following terms?
(i) Rearing (ii) Shearing (iii) Sericulture

Answer

i) Rearing is the process of keeping, feeding, breeding and giving medical care of animals like silkworm ,sheep and goat etc is called rearing

ii) Shearing is a process of removal of animal hair like sheep by using machines is called shearing

iii)the process of rearing of the silk worm to obtain good silk is called rearing.

Question 5

Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them.

Shearing, __________, sorting, __________, __________, _________.

Answer

Shearing, Scouring, sorting, picking of burrs, dying of fibres, making of yarn

Question 6

Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.

Answer

Question 7

Out of the following, which are the two terms related to silk production?

Sericulture, floriculture, moriculture, apiculture and silviculture.

Hints: (i) Silk production involves cultivation of mulberry leaves and rearing silkworms.

(ii) Scientific name of mulberry is Morus alba

Answer

Sericulture and moriculture

Question 8

Match the words of Column I with those given in Column II:

Answer

Question 9

Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.

Down

(D) 1 : Thorough washing

2 : Animal fibre

3 : Animal fibre

Across

(A) 1 : Keeps warm

2 : Its leaves are eaten by silkworms

3: Hatches from egg of moth

Answer

Down:

1D. Scour

2D. Silk

3D. Fibre

Across

1A. Wool

2A. Mulberry

3A. Caterpillar