NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric

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Written by Team Trustudies
Updated at 2021-05-07


NCERT solutions for class 7 Science Chapter 3 Fibre To Fibric Exercise

Q.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?



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

(a) Wool is obtained from the hairy fibers (hair) of the sheep.

(b) White fleece of the lamb refers to the white-colored hair of the lamb.

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.



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

(iii) both a and b

Q.3 Which of the following does not yield wool? (i) Yak (ii) Camel (iii) Goat (iv) Woolly dog



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

(iv) Woolly dog

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



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

(i) Rearing:
The process of keeping, feeding, breeding, and medical care of useful animals is called the rearing of animals.
Rearing means bringing up and taking care of little sheep until the sheep becomes fully grown.
These animals produce one or more useful products for human beings.

(ii)Shearing:
The process of removing the fleece of the sheep along with a a thin layer of skin is called shearing.
It is done using machines similar to those used by barbers to remove hairs..

(iii) Sericulture:
Rearing of silkworms to get silk is called Sericulture.
It’s the process where the rearing of silkworms is done for the production of silk.

Q.5 Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them. Shearing, ________ , sorting,________, __________



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

Shearing, Scouring , sorting, picking of burrs , dying of fibres , 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 silk.



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

Q.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.



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

Sericulture and moriculture

Q.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



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


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

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
(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 an egg of a moth



NCERT Solutions for Class 7 Science Chapter 3 Fibre To Fibric


Answer :

Down:

1D: Scour
2D: Silk
3D: Fibre

Across:

1A: Wool
2A: Mulberry
3A: Caterpillar



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