NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric

NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric

Exercises

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 is obtained from hairy skin called fleece of the sheep.

b) The white fleece of the lamb is lamb’s fur.

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:- (iv) Woolly dog

Question 4. What is meant by the following terms?

(i) Rearing (ii) Shearing (iii) Sericulture

Answer:- (i) Rearing: The process of keeping, feeding, breeding and caring of useful animals is called rearing. These animals produce one or more beneficial items such as for milk and fur for human beings.

(ii) Shearing is the process of removing the fleece and a thin layer of skin from a sheep’s body in order to get wool.

(iii) Sericulture is the raising of silkworms for the purpose of producing silk.

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:-