NCERT Solutions - Fibre to Fabric Class 7 Notes | EduRev

Science Class 7

Class 7 : NCERT Solutions - Fibre to Fabric Class 7 Notes | EduRev

The document NCERT Solutions - Fibre to Fabric Class 7 Notes | EduRev is a part of the Class 7 Course Science Class 7.
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Excercise

Ques 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.’

Ans: the following:
(a) Which parts of the black sheep have wool?
(b) What is meant by the white fleece of the lamb?

Ans:- 

(a) The hairy skin i.e. fleece of the black sheep have wool.

(b) White fleece means the white coloured hair of the lamb.

Ques 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

Ans:
► (iii) both a and b

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

Ans:
► (iv) Woolly dog

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

Ans:
(i) Rearing : 
It means taking care of herds of animals which includes feeding, grazing, breeding, etc. for economical purpose like meat and other useful products.
(ii) Shearing : The removal of fleece of the sheep along with a thin layer of skin from its body is called shearing.
(iii) Sericulture : The rearing of silkworms to obtain silk economically is called sericulture.

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

Ans:
Shearing, scouring, sorting, burrs picking, dying, rolling

Ques 6. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.
Ans:

NCERT Solutions - Fibre to Fabric Class 7 Notes | EduRev

The two stages in the life history of the silk moth which are directly related to the production of silk:
Spinning of cocoon of silk threads around caterpillar.
Changing of caterpillar into pupa.

Ques 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.

Ans:
Sericulture and moriculture

 

Ques 8. Match the words of Column I with those given in Column II:

Column IColumn 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


Ans:

Column IColumn II
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

Ques 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

(D) 1 : Thorough washing
      2 : Animal fibre
      3 : Long thread like structure
Across
(A) 1 : Keeps warm
      2 : Its leaves are eaten by silkworms
      3 : Hatches from egg of moth

NCERT Solutions - Fibre to Fabric Class 7 Notes | EduRev

Ans:-

NCERT Solutions - Fibre to Fabric Class 7 Notes | EduRev

 

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