Ncert solutions science class 7 Solutions for Chapter 3 fibre to fabric

Exercises in Chapter 3 fibre to fabric Grade 7

Exercise

Questions in Exercise

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?

Q1) 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?

State similarities and differences between the laboratory thermometer and the clinical thermometer.

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.

Q2) 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.

Q3) Which of the following does not yield wool?

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

Which of the following does not yield wool?

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

Q4) What is meant by the following terms?

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

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

Match the following :

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

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

Q5) Given below is a sequence of steps in the processing of wool. Which are

the missing steps? Add them.

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

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

Q6) Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.

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

Q7) 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.

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

Q8) Match the words of Column I with those given in Column II:

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

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

Q9) 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 Across

(D) 1 : Thorough washing (A) 1 : Keeps warm

2 : Animal fibre 2 : Its leaves are eaten by silkworms

3 : Long thread like structure 3 : Hatches from egg of moth

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Chapters in this book

Nutrition in Plants

Nutrition in Animals

Fibre to Fabric

Heat

Acids, Bases and Salts

Physical and Chemical Changes

Weather, Climate and Adaptations of Animals to Climate

Winds, Storms and Cyclones

Soil

Respiration in Organisms

Transportation in Animals and Plants

Reproduction in Plants

Motion and Time

Electric Current and its Effects

Light

Water: A Precious Resource

Forests: Our Lifeline

Wastewater Story