Goa Board Class 7 Solutions for Science – Fibre to fabric (English Medium)
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?
Solution :
(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
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
Solution :
(iii) both a and b
Concept insight: Caterpillar is the larva of silkworm.
Question 3:
Which of the following does not yield wool?
(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog
Solution :
Question 4:
What is meant by the following terms?
(i) Rearing (ii) Shearing (iii) Sericulture
Solution :
(i)Rearing: Rearing is raising livestock like goat, cows, sheep etc for commercial purpose by taking them out in herds for grazing , feeding them on a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals for better growth and yield of produce like meat, milk, wool.
(ii) Shearing: It is the process of removal of fleece along with a thin layer of skin from the body of sheep.
(iii) Sericulture: Sericulture refers to the rearing of silkworms to obtain silk.
Question 5:
Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them.
Shearing, __________, sorting, __________, __________, __________
Solution :
Question 6:
Solution :
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.
Solution :
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 |
Solution :
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 (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
Solution :