Fibre to Fabric | Science | Chapter 3 || Class 7th |

JANDKNCERT | Science | Jammu and Kashmir |

Fibre to Fabric | Science | Chapter 3 || Class 7th |

 

Chapter 3: Fibre to Fabric

(Post sent by Manjeet Kumar – A teacher by Profession from Doda – Visit his Website https://www.myanswershub.com for more Science Solution)

Exercises

Q1. 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?

Ans. The hair of the sheep has wool in it.

(b) What is meant by the white fleece of the lamb?

Ans. The white fleece of lamb means white coloured hair of the lamb

 Q2. 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

Q3. Which of the following does not yield wool?

(i) Yak

(ii) Camel

(iii) Goat

(iv) Woolly dog

Ans. iv) Woolly Dog

Q4. What is meant by the following terms?

(i) Rearing

(ii) Shearing

(iii) Sericulture

Ans.

i) Rearing: The upbringing of sheep or other domestic animals for our use is called as rearing.

ii) Shearing: The process of removing of fleece or hairy skin of the sheep is termed as shearing.

iii) Sericulture: The process of rearing of silkworms for silk production is called sericulture.

Q5. The science of raising, of silkworms so as to obtain silk cocoons is called:

a) Apiculture

b) Horticulture

c) Sericulture

d) Pisciculture

Ans. Sericulture.

Q6. The hair on the skin of the sheep, yak, etc, from which wool can be obtained.

a) Wool

b) Fleece

c) Silk

d) Yarn

Ans. Fleece

 

Also Read: Solutions of Science 7th

 

Q7. The proper sequence of the life cycle of a silkworm is:

a) Egg → Pupa →Caterpillar

b) Pupa→ Egg → Caterpillar

c) Eggs → Caterpillar → Pupa

d) Caterpillar → Egg → Pupa

Ans. Eggs → Caterpillar → Pupa

Q8. Which of the following diseases is caused due to the wool industry?

a) Typhoid

b) Cholera

c) Tetanus

d) Anthrax

Ans. Anthrax

Q9. Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them.

Shearing, __________, sorting, __________, __________.

Ans. 1. Shearing 2. Scouring 3. Sorting 4. Picking of Burrs 5. Dyeing 6. Rolling into Yarns

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

Q11. Out of the following, which are the two terms related to silk production?

Sericulture, floriculture, moriculture, apiculture and silviculture.

Hints: (i) Silk production involves the cultivation of mulberry leaves and rearing silkworms.

(ii) The scientific name of mulberry is Morus alba.

Ans. The terms sericulture and moriculture are related to silk production.

Q12. Match the words of Column I with those given in Column II:

Column I	Column II
1. Scouring	a) Yields silk fibres
2. Mulberry leaves	b) Wool yielding animal
3. Yak	c) Food of silkworm
4. Cocoon	d) Taking out threads from the cocoon
5. Reeling	e) Cleaning sheared skin

 Ans.

Column I	Column II
1. Scouring	e) Cleaning sheared skin
2. Mulberry leaves	c) Food of silkworm
3. Yak	b) Wool yielding animal
4. Cocoon	a) Yields silk fibres
5. Reeling	d) Taking out threads from the cocoon

Q13. 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

(A) 1. Keeps warm

2. Its leaves are eaten by silkworms

3. Hatches from the egg of a moth

Ans.