CBSE Class 7 Science Fiber To Fabric Worksheet

I. FILL IN THE BLANKS

1. Silk fibres from _______________ are separated out and reeled into silk threads.

2. Silk fibre is made up of a ___________________.

3. In _____________________ the sheared skin is cleaned.

4. ___________________ bacterium causes sorter’s disease.

5. Wool is obtained from the _________________ of the sheep.

II. TRUE OR FALSE

1. Silk fibres are spun into silk threads.

2. A female moth lays only a very few eggs at a time.

3. In winters, sheep are kept outdoors.

4. The hair of sheep have small fluffy fibre called burrs.

III. NAME THE FOLLOWING

1. The most common silk moth.

2. Two types of silk.

3. Two Indian breeds of sheep.

4. The process of separating hair of different textures for making wool.

5. The process of taking out threads from the cocoon for use as silk.

IV. DEFINE

1. Selective breeding

2. Sericulture

3. Rearing

1.Complete the correlation:
Silk worm : Cocoon, Wool:
(A) Hair of rabbit.
(B) Cotton plant.
(C) Fleece of sheep.
(D) Jute of hemp.

2.Which of the following is not a stage?
(A) Pupa.
(B) Caterpillar.
(C) Larva.
(D) Sericulture.

3.Which fibres are used to make clothes?
(A) Natural.
(B) Synthetic.
(C) Both 'a' and 'b'.
(D) None of these.

4.Silk thread woven by silkworm around its larva is made up of-
(A) Carbohydrate.
(B) Fat.
(C) Protein.
(D) Oil.

5.Which of the following can provide hair as wool source?
(A) Camel.
(B) Ilama.
(C) Alpaca.
(D) All of these.

6.Scientific name of mulberry is-
(A) Morus alba
(B) Triticum aestivum.
(C) Zea maize.
(D) Mulberry.

7.The best season(s) for shearing is/are-
(A) Spring and autumn.
(B) Complete hot season.
(C) Summer.
(D) None of these.

8.The splitting of woollen web into fine thin strands for spinning is called
(A) Roving
(B) Sericulture
(C) Reeling
(D) Moulting

9.Cocoon is -
(A) The fibre cover spun by the silk larva around its body on changing into pupa state.
(B) The stage of larva.
(C) Both 'a' and 'b'.
(D) None of these.

10.The thread obtained by reeling process is called-
(A) Fiber.
(B) Raw silk.
(C) Both 'a' and 'b'.
(D) None of these.

11.Caterpillars spin their cocoons at which stage?
(A) Pupa stage.
(B) Larval stage.
(C) Both 'a' and 'b'.
(D) None of these.

12.Which animal material is used to weave fine, soft shawls called Pashmina?

13.Where are the sheep kept in winters?

14.Name the most common silk moth.

15.How many eggs can a female silk moth lay?

16.What treatment is given to the cocoons to separate out the threads?

17.Sorter's disease is associated with-
(A) Cotton industry.
(B) Wool industry.
(C) Silk industry.
(D) None of the above.

18.In the life cycle of silkworm, which stage comes before?
(A) Cocoon.
(B) Caterpillar.
(C) Cocoon with developing moth.
(D) Adult.

19.Types of silk are-
(A) Angora and mooga.
(B) Tassar and kosa.
(C) Angora and tassar.
(D) Kosa and angora.

20.What is meant by Shearing

21.Give reasons - Why it hurts when someone pulls his hair but not when he goes for a haircut?

22.Give reasons - Why a cotton garment cannot keep us as warm in winter as a woollen sweater can?

23.This wool is common in Tibet and Ladakh
(A) Angora goat
(B)Yak Wool
(C) Alpaca wool
(D) Camel wool.

24.Which breed is used to make carpets?
(A) Nali
(B) Lohi
(C) Bakharwal
(D) Marwari

25.Where do you find Bakharwal breed?
(A) Gujarat
(B) Rajasthan
(C) Punjab
(D) Jammu and Kashmir.

26.Which one among these is a quality wool?
(A) Lohi
(B) Nali
(C) Patanwadi
(D) Bakharwal

27.This bacterium causes sorter's disease
(A) antherax
(B) Lactobacillus
(C) Rhizobium
(d)Yeast

28.Which country leads the world in silk production?
(A) India
(B) Japan
(C) China
(D) Italy.

29.What are called occupational hazards?

30.Commonly available wool in the market is of
(A) Yak wool
(B) Sheep woll
(C) Goat wool
(D) Camel wool

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31.What is reeling?

32.Define Sericulture.

33.Write sequence of steps in the processing of wool.

34.Write about feeding of sheep

35.Name any four wool-yielding animals.

36.What is selective breeding?

37.Name two types of fibres which form the hairy skin of the sheep.

38.Why wool yielding animals have a thick coat of hair?

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39.Write and draw the various stages of the life history of silk moth.

40.How is silk produced?

41.Explain the steps of processing fiber into wool.

42.Explain the steps of processing fiber into wool.

1) Answer briefly:

a) Name the country which leads the world in silk production

b) Cultivation of mulberry leaves is called

c) Rearing honey bees is called

d) Scientific Name of mulberry is

e) Name three animals which yield wool

f) Name the process of selecting parents for obtaining special characters in their offspring

g) Name two kinds of goat which yield wool

h) Name two breeds of camel found in south in South America which yield wool

i) Name 4 major wool producing countries

j) The process of removing fleece from the body of sheep-

2) Answer the following questions:

a) Define 1) Rearing 2) Sericulture 3) Reeling.

b) Describe how silk worm enters the pupa stage.

c) Describe how silkworms are reared for their cocoons.

d) How can you differentiate between an artificial silk and natural silk by doing burning test?

3) Fill ups:

a. Tiny eggs of silkworm are hatched into________________.

b. Silk is obtained from the _____________ of silkworm.

c. ______________is the disease caused by the bacterium Anthrax.

d. The cocoons are put in _____________to loosen the silk fibre.

4. Multiple choice questions:

a. Which of the following is not an animal fibre-
1) Silk 2) Wool
3) Polyester 4) None of these

b. Silkworm is reared through-
1) Apiculture 2) Sericulture
3) Agriculture 4) None of these

c. A non mulberry silk product is-
1) Moga silk 2) Eri silk
3) Tassar silk 4) All of these

Chapter 3: Fibre to Fabric

1. Wool is obtained from the ______________ of the sheep or yak.

2. __________ is the name of the breed of sheep from which we get Kashmiri shawls.

3. By the process of _____________ we get off springs with special characters.

4. Washing of sheared skin is known as ______________

5. In __________ the hairs of different textures are separated.

6. Silk fibre is made up of a __________

7. The silk fibre is obtained from the covering of pupa known as ______________

8. The larva of silk worm are called______________

9. Inside cocoon, the pupa develops into ______________

Name the following :

1. Two wool giving animals.

2. Two Indian breeds of sheep.

3. Two types of silk.

4. Name the most common silk.

5. Bacterium which causes sorter’s disease.

6. The country from where silk industry started.

7. Process of taking out silk – threads from cocoon.

Write true or false:

1. Soft silk yarn is strong as comparable thread of steel.

2. Shearing hurts the sheep.

3. Small fluffy fibres are called burrs.

Define :
• Shearing
• Seri culture.
• Selective breeding
• Rearing