Clothes are our fundamental need. It protects us from heat, cold and rain. Clothes are made of fibre. Fibre is a long, thin, springy, thread-like web emanating from animals or plants. The fibre originating from animals is referred to as animal fibre. For example, wool and silk. In contrast, the fibre derived from plants is referred to as plant fibre. For example, Cotton, jute, and flax.
Download Class 7 Chemistry Worksheet on Chapter 3 Fibre to Fabric Set 3 PDF
CBSE Class 7 Chemistry Chapter 3 Fibre to Fabric Worksheet – Set 3
Q1. The process of rearing silkworms for silk is known as ________.
(a) Sericulture
(b) Pisciculture
(c ) Agriculture
(d) None of the above
Q2. Which of the following animals yield wool?
(a) Goat
(b) Sheep
(c ) Rabbit
(d) All of the above
Q3. Which of the following is not a variety of silk?
(a) Mulberry silk
(b) Muga silk
(c ) Moth silk
(d) None of the above
Q4. Which of the following is not an animal fibre?
(a) Pashmina
(b) Polyester
(c ) Wool
(d) None of the above
Q5. Silkworms are made of ______.
(a) Proteins
(b) Vitamins
(c ) Minerals
(d) All of the above
Q6. State true or false.
The methodology of raising silkworms for silk is known as pisciculture.
Q7. ______ leaves are fed to the silkworm.
Q8. State true or false.
The process of cultivation of mulberry plants is known as mulberry culture.
Q9. _______ has the majority of woollen units.
Q10. The _______ stage of silkworms requires a lot of feeding.
Q11. Why is the silk pupa killed?
Q12. What are the steps involved in sericulture?
Q13. Name any two diseases associated with sericulture.
Q14. What is shearing?
Q15. What is moulting?
Q16. What is cooking in silk production?
Q17. What is scouring? Explain its significance.
Q18. What is sericulture?
Q19. What are the health problems associated with sericulture?
Q20. Explain the lifecycle of a silkworm.
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