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WorksheetsClass 7 science
Total questions: 10
Worksheet time: 10mins
Which of the following process is not part of wool extraction?
Shearing
Sorting
Scouring
Reeling
The cut of 'wool coat' of a sheep along with the thin layer of skin is called
Grease
Fleece
Wool
Burrs
Which of the following produce silk?
Larva
Pupa
Silk moth
Eggs
After scouring ,the next process is
Shearing
Sorting
Spinning
Combing
The silkworm spins cocoon in the pattern of
Zero
1
8
6
The bacterium by which the people working in wool industry get infected is
Rhizobium
Anthrax
Streptococcus
Bacillus
In which of the following process new offspring with special characters is produced by selecting parents
Reeling
Selective breeding
Separating
Rearing
Which of the following is formed as the small fluffy fibres of wool ?
BallS
Burrs
Reels
Combs
Which component is present in silk fibre
Carbohydrates
Lipids
Proteins
Fats
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
3,1,5,2,4,6
5,2,6,1,3,4
4,1,3,5,6,2
6,5,4,3,2,1
