are mentioned. The entire process of converting this fibre into a fabric is covered in the following stages:
-
From fibre to wool - rearing and breeding of sheep
-
Processing fibre into wool
It further includes the following steps:
1. Shearing
2. Scouring
3. Sorting
4. Dyeing
5. Rolling
Likewise, the second section of the chapter, Fibre to fabric, explains the second fibre - silk wherein the term sericulture is defined. With the help of a diagram, different stages of the lifecycle of a silk moth are discussed thoroughly. Understanding of how a caterpillar grows into a cocoon which is further converted into silk is comprehensively covered. Different varieties of silk-like mulberry silk, Moga silk, Tussar silk and Kosa silk are mentioned. Short information about the discovery of silk is also provided in the chapter, Fibre to Fabric.
The chapter, Fibre to Fabric is covered under the following sections:
- Wool
- Silk
Page No 32:
Question 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?
Answer:
(a) Wool is obtained from the hairy fibres (hair) of the sheep.
(b) White fleece of the lamb refers to the white coloured hair of the lamb.
Page No 32:
Question 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
Answer:
(iii) both a and b
Page No 32:
Question 3:
Which of the following does not yield wool?
(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog
Answer:
(iv)Woolly dog
Page No 32:
Question 4:
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 fleece along with a thin layer of skin from the body of sheep.
(ii) Sericulture: Sericulture refers to the rearing of silkworms to obtain silk.
Page No 32:
Question 5:
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 fibres__, making of yarn__
Page No 32:
Question 6:
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
Page No 32:
Question 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.
Answer:
Sericulture and moriculture
Page No 32:
Question 8:
Match the words of Column I with those given in Column II:
|
Column I |
Column II |
||
|
(i) |
Scouring |
(a) |
Yields silk fibres |
|
(ii) |
Mulberry leaves |
(b) |
Wool yielding animal |
|
(iii) |
Yak |
(c) |
Food of silk worm |
|
(iv) |
Cocoon |
(d) |
Reeling |
|
(e) |
Cleaning sheared skin |
Answer:
|
Column I |
Column II |
||
|
(i) |
Scouring |
(e) |
Cleaning sheared skin |
|
(ii) |
Mulberry leaves |
(c) |
Food of silk worm |
|
(iii) |
Yak |
(b) |
Wool yielding animal |
|
(iv) |
Cocoon |
(a) |
Yields silk fibres |
Page No 33:
Question 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 Across
(D) 1: Thorough washing (A) 1: Keeps warm
2: Animal fibre 2: Its leaves are eaten by silkworms
3: Long thread like structure 3: Hatches from egg of moth
Answer:
View NCERT Solutions for all chapters of Class 7