Question’s Answer Exercises NCERT
Class 07 (Science)
Chapter 03
FIBRE TO FABRIC
Q.01.
You must be familiar with the following nursery rhymes:
(a)
‘ Baa baa black sheep, have you any wool’
(b)
‘ Mary had a little lamb, whose fleece was white as snow’
Answer
the following:
(1)
Which parts of the black sheep have wool?
(2)
What is meant by the white fleece of the lamb?
Ans:- (a) The hairy skin called fleece has wool in black sheep.
(b) White fleece of the lamb means the white coloured hairy skin.
Q.02.
The silkworm is (a) a caterpillar (b) a larva. Choose the correct option.
(1)
a (2) b
(3) both a and b (4) neither a nor b
Ans:- (3) both a and b
Q.03.
Which of the following does not yield wool?
(1)
Yalk (2) camel (3) Goat (4) Wooly dog
Ans:- (4) Wooly dog
Q.04.
What is meant by the following terms?
(1)
Rearing (2) Shearing (3) Sericulture
Ans:- (1) Rearing:- Raising of domestic animals like sheep, goat, yak, cow and buffaloes for commercials purposes such as for milk and fur is known as rearing.
(2) Shearing:- Shearing is a process of removal of animal hair by using machines similar to those used by barbers.
(3) Sericulture:- Rearing of silkworms to get silk is known as sericulture.
Q.05.
Given below is a sequence of steps in the processing of wool. Which are missing
steps? Add them.
Shearing,
__________, Sorting, __________, ___________, ________.
Ans:-
Shearing, Scouring, Sorting, picking of burrs, dying of fibres, rolling.
Q.06. Make sketches of the two stages in
the life history of the silk moth which are directly related to the production
of silk.
Ans:-
Q.07.
Out of the following, which are the two terms related to silk production?
Sericulture,
floriculture, moriculture, apiculture and silviculture.
Hints:
(1)
Silk production involves cultivation of mulberry leaves and rearing silkworms.
(2)
Scientific name of mulberry is morus alba.
Ans:- Sericulture and moriculture
Q.08.
Match the words of Column A with those given in Column B.
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Column
A |
Column
A |
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1. Scouring |
(a) Yields silk fibres |
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2. Mulberry leaves |
(b) Wool yielding animal |
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3. Yak |
(c) Food of silk worm |
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4. Cocoon |
(d) Reeling |
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(e) Cleaning sheared skin |
Ans:-
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Column
A |
Column
A |
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1. Scouring |
(e) Cleaning sheared skin |
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2. Mulberry leaves |
(c) Food of silk worm |
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3. Yak |
(b) Wool yielding animal |
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4. Cocoon |
(a) Yields silk fibres |
Q.09. Given below is a crossword puzzle
based on the lesson. Use hints to fill in the blanks spaces with letters that
complete the words.
Down (D)
1- Through washing
2- Animal fibre
3- Long thread like
structure
Acros (A)
1- Keeps warm
2- Its leaves are eaten by silkworms
3- Hatches from egg of moth
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3A |
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Ans:-
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