NCERT Solutions for Class 7 Science Fibre to Fabric [Old Book]

NCERT
SOLUTIONS
CLASS - 7TH

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Book : Science Ncert Solutions | Chapter-3 Science

Class : 7th
Subject : Science
Chapter : 3
Chapter Name : Fibre to Fabric

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 eece was white as snow.'
Answer the following:
(a) Which parts of the black sheep have wool?
(b) What is meant by the white eece of the lamb?

Answer. (a) Wool is obtained from the hairy bres (hair) of the sheep.
(b) White eece of the lamb refers to the white coloured hair of the lamb.

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

Answer. (iii) both a and b

Q3 Which of the following does not yield wool?
(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog

Answer. (iv)Woolly dog

Q4 What is meant by the following terms?
(i) Rearing (ii) Shearing (iii) Sericulture

Answer. (i) Rearing: Rearing means helping someone to grow up.
(ii) Shearing: It is the process of removal of eece along with a thin layer of skin from the body of
sheep.
(ii) Sericulture: Sericulture refers to the rearing of silkworms to obtain silk.

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Q5 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 bres, making of yarn.

Q6 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 silk moth directly related to silk production are

Q7 Out of the following, which are the two terms related to silk production? Sericulture,
oriculture, moriculture, apiculture and silviculture
Hints: (i) Silk production involves cultivation of mulberry leaves and rearing silkworms.
(ii) Scienti c name of mulberry is Morus alba.

Answer. Sericulture and moriculture

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

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Q9 Given below is a crossword puzzle based on this lesson. Use hints to ll in the blank spaces
with letters that complete the words
Down (D)
1 : Thorough washing
2 : Animal bre
3 : Long thread like structure
Across(A)
1 : Keeps warm
2 : Its leaves are eaten by silkworms
3 : Hatches from egg of moth

Page : 33 , Block Name : Exercise

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