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NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric

NCERT solutions for class 7 science chapter 2 : Solved Exercise Questions:

1. You must be familiar with the following nursery rhyme:

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

Answer the following:

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

Answer:

(a) Black sheep have wool in the skin part.

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

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

Answer the following:

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

Answer:

(b) White fleece means the hair (from where the wool is obtained) of lamb.

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:

The female silk moth lays eggs, from which hatch larvae which are called caterpillars or silkworms

Hence correct option: (iii) both a and b

3. Which of the following does not yield wool?

(i) Yak

(ii) Camel

(iii) Goat

(iv) Woolly dog

Answer:

(iv) Woolly dog does not yield wool.

4. What is meant by the following terms?

(i) Rearing

Answer:

Rearing means helping animals to grow includes grazing, feeding or breeding for some profit or other pleasure. It also helps animals from the problems of itching, odour, and waste.

4. What is meant by the following terms?

(ii) Shearing

Answer:

The fleece of the sheep along with a thin layer of skin is removed from its body. This process is called shearing.

4. What is meant by the following terms?

(iii) Sericulture

Answer:

The rearing of silkworms for obtaining the spinned silk is called sericulture.

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

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

Answer:

The complete steps for the processing of the wool.

Shearing, scouring , sorting, cleaning of burrs , dyeing , rolling .

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:

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

Silkworm and cocoon

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 are related to silk production.

Sericulture: Rearing of silkworms to obtain silk.

Moriculture: The science of cultivation of mulberry leaves for silk production.

Therefore, the silk industry is dependent on sericulture which in turn is dependent on moriculture. Hence, both are related to silk production.

8. Match the words of Column 1 with those given in Column 2:

Column 1 Column 2

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

Answer:

Column 1

Column 2

1. Scouring

(e) Cleaning sheared skin

2. Mulberry leaves

(c) Food of silk worm

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 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.

Answer:

Down

Across

1. SCOUR

1. WOOL

2. SILK

2. MULBERRY

3. FIBRE

3. CATERPILLAR

Responsive Table
Chapter No. Chapter Name
Chapter 1 NCERT solutions for class 7 science chapter 1 Nutrition in Plants
Chapter 2 NCERT Solutions for class 7 science chapter 2 Nutrition in Animals
Chapter 3 NCERT solutions for class 7 science chapter 3 Fibre to Fabric
Chapter 4 NCERT solutions for class 7 chapter 4 science Heat
Chapter 5 NCERT solutions for class 7 science chapter 5 Acids Bases and Salts
Chapter 6 NCERT solutions for class 7 science chapter 6 Physical and Chemical Changes
Chapter 7 NCERT solutions for class 7 science chapter 7 Weather Climate and Adaptations of Animals to Climate
Chapter 8 NCERT solutions for class 7 science chapter 8 Winds, storms and cyclones
Chapter 9 NCERT solutions for class 7 science chapter 9 Soil
Chapter 10 NCERT solutions for class 7 chapter 10 Respiration in Organisms
Chapter 11 NCERT solutions for class 7 science chapter 11 Transportation in Animals and Plants
Chapter 12 NCERT solutions for class 7 science chapter 12 Reproduction in Plants
Chapter 13 NCERT solutions for class 7 science chapter 13 Motion and Time
Chapter 14 NCERT solutions for class 7 science chapter 14 Electric Current and its Effects
Chapter 15 NCERT Solutions for class 7 science chapter 15 science Light
Chapter 16 NCERT solutions for class 7 science chapter 16 Water A Precious Resource-
Chapter 17 NCERT solutions for class 7 science chapter 17 Forests Our lifeline
Chapter 18 NCERT solutions for class 7 science chapter 18 Wastewater Story

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