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Worksheets

Class 7 science

Total questions: 10

Worksheet time: 10mins

Name
Class
Date
1.

Which of the following process is not part of wool extraction?

a)

Shearing

b)

Sorting

c)

Scouring

d)

Reeling

2.

The cut of 'wool coat' of a sheep along with the thin layer of skin is called

a)

Grease

b)

Fleece

c)

Wool

d)

Burrs

3.

Which of the following produce silk?

a)

Larva

b)

Pupa

c)

Silk moth

d)

Eggs

4.

After scouring ,the next process is

a)

Shearing

b)

Sorting

c)

Spinning

d)

Combing

5.

The silkworm spins cocoon in the pattern of

a)

Zero

b)

1

c)

8

d)

6

6.

The bacterium by which the people working in wool industry get infected is

a)

Rhizobium

b)

Anthrax

c)

Streptococcus

d)

Bacillus

7.

In which of the following process new offspring with special characters is produced by selecting parents

a)

Reeling

b)

Selective breeding

c)

Separating

d)

Rearing

8.

Which of the following is formed as the small fluffy fibres of wool ?

a)

BallS

b)

Burrs

c)

Reels

d)

Combs

9.

Which component is present in silk fibre

a)

Carbohydrates

b)

Lipids

c)

Proteins

d)

Fats

10.

Steps for the production of silk are given below in a jumbled order arrange them in proper sequence


1. Eggs are warmed to suitable temperature for the larvae to hatch from eggs

2. Fibres are taken out from the cocoon .

3. The larvae /Caterpillar or silkworms are kept in clean traysv along with freshly clopped Mulberry leaves.

4. Female Silk moths lay eggs

5. After 25 to 30 days , the Caterpillar stop eating and start spinning cocoons.

6. Cocoons are kept under the sun or boiled in water

a)

3,1,5,2,4,6

b)

5,2,6,1,3,4

c)

4,1,3,5,6,2

d)

6,5,4,3,2,1