NCERT solution for class 7th // Science // Chapter 3 - Fibre to fabric

 NCERT solutions  > class 7 > Science >chapter 3 Fibre to fabric 

NCERT solution for class 7th  // Science // Chapter  3 - Fibre to fabric


Chapter  3 - Fibre to fabric

 Q1 . You must be familiar with the following nursery rhymes 

a) Baa baa baa baa black sheep have you any wool  .

b) Mary had a little lamb whose fleece was white as snow 

Answer the following

  i) Which part of the Black sheep have wool 

ii) What is mean by the white fleece of the lamb 

Ans i) A thin and soft  hair  of the black sheep have a wool  

ii ) White fleece means the colour of the fleece is white

Q2. The silkworm is( a) a caterpillar ( b)a lava choose the correct option

i)  a      ii) b     iii) both a and b   iv) neither a nor b 

Ans - Both and b

Q3. Which of the following does not yield wool  

i) Yak. ii)  Camel.  iii)  Goat   iv) Woolly dog 

Ans - Woolly dog

Q4 . What is mean by following terms 

Rearing, Sharing ,Sericulture 

Ans- a) Rearing  - 

Raising and taking care of livestock eg cow , buffaloes ,goat for commercial purpose is called rearing

b) Sharing 

 sheep have a thick coat of wool ( hairs) on its body The removal of the fleece ( hairs) of sheep along with a thin layer of skin is called sharing . it can be done with the help of machine

c) sericulture 

rearing  or breeding of silkworm for the production of silk is called sericulture 

Q5 . Given below are a sequence of steps in the processing of wool which are the missing step add them .

Sharing _____ ,sorting,________ ,_______,______

Ans - Sharing , Scouring , Sorting , Fibre spinning , fibre drying , Spinning silk yarn

Q6 . Make sketches of the two stages in the life history of the silkmoth which are directly related to the production of silk

Ans- 


Q7 . Out of the following which are the two terms related to silk production 

Sericulture, Floriculture ,Moriculture , Apiculture, Silviculture 

(Hints -  silk production involves cultivation of mulberry leaves and rearing silkworm

Scientific name of mulberry is morus Alba )

Ans - Sericulture , Moriculture 

Q8 . Match the words of column I with those given in column II 

Column I                            Column II

a)  Scouring                        yields silk fibres 

 b) Mulberry leaves                wool yielding animals 

c) Yak.                                    food of silkworm 

d) Cocoon                                Reeling 

                                   Cleaning sheared skin 
Ans

Column I                            Column II

a)  Scouring                      Cleaning sheared skin 
 
b)Mulberry leaves            food of silkworm 

c) Yak.                                 wool yielding animals
 
d) Cocoon                              yields silk fibres                                

Q9 . Given below is a crossword puzzles based on this lesson use heels to feel in the blank space with letters that complete the words

Down

 1 ) Through washing 

 2) Animal fibre 

3)  Long thread like structure 

Across

  1) Keeps warm

 2) Its leaves are eaten by silkworm

3)  Hatches from egg of moth 

Ans - 

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