Question

NCERT Solutions Class 7 Science Chapter 3 Fibre to Fabric provided here are prepared by the experts of the subject matter. Experts have used simple language for holistic learning to make it easy for students to learn and comprehend all concepts. We have made solutions very concise to make the solutions to the point which will save students time while studying. These NCERT solutions are designed in such a manner that they will assist the learners during their CBSE term I board exams and as we in their preparation for competitive exams like JEE Mains, JEE Advance, or other similar exams. Our NCERT Solutions Class 8 has one-step solutions for all you need. Important topics mentioned in this chapter are:

• Fibres
• Types of Fibres
• Silk
• Wool
• Sources of Wool
• How to Process Wool Fibre?

These NCERT Solutions Class 7 Science are very important for exams. To gain a complete understanding of the subject matter one must go through all the topics mentioned here.  One must refer to our solutions for solving questions, revision, and doing homework with ease. Now all the solutions and practice questions are at your fingertip to get started.

Answer 1

NCERT Solutions Class 7 Science Chapter 3 Fibre to Fabric

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 the hairy fibres of the sheep.

b) White fleece of the lamb refers to the white colour of their fur.

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

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

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

Answer:

i) Raising of domestic animals like sheep, goats, yak, cows and buffaloes for commercial purposes, such as for milk and fur is known as rearing.

ii) Shearing is a process of removal of animal hair by using machines similar to those used by barbers.

ii) Rearing of silkworms to get silk is known as Sericulture.

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.

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:

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

Sericulture, floriculture, moriculture, apiculture and silviculture.

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

(ii) Scientific name of mulberry is Morus alba.

Answer:

Sericulture and moriculture

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

Column-I	Column-I
1. Scouring	(a) Yields silk fibres
2. Mulberry leaves	(b) Wool-yielding animal
3. Yak	(c) Food of silkworm
4. Cocoon	(d) Reeling
	(e) Cleaning sheared skin

Answer:

Column-I	Column-I
1. Scouring	(e) Cleaning sheared skin
2. Mulberry leaves	(c) Food of silkworm
3. Yak	(b) Wool-yielding animal
4. Cocoon	(a) Yields silk fibres

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 the egg of a moth

Answer:

Down:

1D. Scour

2D. Silk

3D. Fibre

Across

1A. Wool

2A. Mulberry

3A. Caterpillar