Clothes are the primary need of life. It protects us from heat, cold and rain. Clothes are made of fibres. Fibres are long, thin, elastic and thread-like networks derived from plants or animals. The fibres derived from plants are known as plant fibre. Cotton, jute, and falx are some examples of plant fibre. In contrast, the fibre derived from animals is known as animal fibre. Wool and silk are examples of animal fibre.
Download Class 7 Chemistry Worksheet on Chapter 3 Fibre to Fabric Set 2 PDF
CBSE Class 7 Chemistry Chapter 3 Fibre to Fabric Worksheet – Set 2
Q1. Which of the following states have the majority of woollen units?
(a) Punjab
(b) Bihar
(c ) West Bengal
(d) None of the above
Q2. Which of the following is obtained from plants?
(a) Cotton
(b) Silk
(c ) Polyester
(d) All of the above
Q3. Which of the following is not an animal fibre?
(a) Pashmina
(b) Jute
(c ) Silk
(d) All of the above
Q4. Which process is used to extract silk thread from the cocoon?
(a) Reeling
(b) Shearing
(c ) Sorting
(d) All of the above
Q5. Wool is graded according to its
(a) Length
(b) Dyeing capacity
(c ) Texture
(d) All of the above
Q6. The sticky fluid secreted by the larva from its salivary glands is a _________.
Q7. The four stages in the life of a silk moth are _____, _______, _______ and ________.
Q8. The cocoon is put in a pot of _______, which kills the worms and loosens the filaments.
Q9. ______ traps more air in it as compared to cotton.
Q10. The insect in the cocoon is killed before ______ the silk.
Q11. Which is the most common variety of silk?
Q12. What is fleece?
Q13. What is selective breeding?
Q14. What is pashmina?
Q15. Why is scouring the shredded wool necessary?
Q16. What is the significance of moulting?
Q17. Why do we kill the silkworm in its cocoon stage?
Q18. What is the primary difference between a silkworm and a silk moth?
Q19. What are the risks associated with the sericulture industry?
Q20. Explain the lifecycle of a silk moth.
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