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NCERT Solutions of Science for Class 7 of Lesson 3 FIBRE TO FABRIC

TEXTUAL EXERCISE

Q.1- You must be familiar with the following nursery rhymes :

(a) Baa baa black sheep, have you any wool.

(b) Mary had a little lamb, whose fleece was white as snow.

Answer the following :

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

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

Ans- (a) The hairy skin of the black sheep have wool.

(b) The fine soft under-hair close to the skin of lamb is called white fleece.

Q.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

Ans- (iii) both a and b

Q 4- Which of the following does not yield wool?

(a) Yak (b) Camel

(c) Goat (d) Woolly Dog

Ans- Woolly Dog.

Q.5- What is meant by following terms :

(i) Rearing (b) Shearing (c) Sericulture

Ans- Rearing – The caring and domestication of useful animals is called rearing.

Shearing – The removal of fleece along with the thin layer of skin from the body of sheep is called shearing.

Sericulture – The rearing of silkworms for obtaining silk is called sericulture.

Q.5- Given below is the sequence of steps in the processing of wool. Which are the missing steps? Add them.

Shearing, ________, sorting, ________, _________ .

Ans- Shearing, scouring, cleaning of burrs, dyeing, rolling.

Q.6- Make sketches of the two stages in the life history of the silk moth which are directly related to the production of the silk.

Ans- The two stages in the life history of the silk moth which are directly related to the production of the silk are :

i) Caterpillar.

ii) Cocoon with pupa.

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Caterpillar
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Cocoon with pupa

Q.7- Out of the following which are the two terms related to silk production :

Sericulture, Floriculture, Moriculture, Apiculture, Silviculture.

Hints :

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

ii) Scientific name of mulberry is Morus alba.

Ans- (i) Sericulture (iii) Moriculture

Q.8- Match the words of Column I with those given in Column II :

NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric Q8

Ans-

NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric Q8.1

Q.9- Given 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 : Long thread like structure.

Across

1 : Keeps warm.

2 : Its leaves are eaten by silkworms.

3 : Hatches from egg of moth.

NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric Q9.1

Ans-

NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric Q9.2