Worksheet for class 7 Science Chapter 3 Fibre to Fabric
This page consists of MCQ-based questions with detailed solutions for Chapter 3 Fibre to Fabric of class 7 science prepared by HT experts. Check out all the worksheets for class 7 science. Do solve NCERT textbook with the help of NCERT solutions for class 7 science.
1. Sheding of skin by caterpillars is called
(a) reeling
(b) moulting
(c) shearing
(d) none of these
Answers:
(b) The larvae are fed on mulberry leaves for about six weeks. During this period each larva sheds its skin four times. This is called moulting. They are ready to spin their cocoons. They climb into branches of trees and start spinning their cocoons. This is called the pupa stage. They take about eight days for the process.
2. Caterpillars spin their cocoons at which stage?
(a) Pupa stage
(b) Larval stage
(c) Both ‘a’ and ‘b’
(d) None of these
Answers:
(a) Caterpillars spin their cocoon at the pupa stage which take about eight days for the process.
3. The thread obtained by reeling process is called
(a) fiber
(b) raw silk
(b) Both ‘a’ and ‘b’
(d) None of these
Answers:
(b) The resulting thread is called raw silk. It is used for weaving clothes, and can be dyed into various colours.
4. Cocoon is
(a) the fibre cover spun by the silk larva around it body on changing into pupa state
(b) the stage of larva
(c) Both ‘a’ and ‘b’
(d) None of these
Answers:
(a) A cocoon is a soft covering that an insect spins with silky threads to protect itself. The thread is formed by the hardening of a liquid secreted by the insect. When the silkworm is fully grown, it is placed on some straw or small bushes on which it can make its cocoon
5. The fabrics made from the used wool, by carding spinning and wearing is called
(a) shoddy
(b) kemp
(c) cocoon
(d) None of these
Answers:
(a) Shoddy is made from the used wool. To made shoddy, the existing wool fabric is cut into small pieces and then carded. The carded wool is then respun into yarn. Such a yarn is inferior to the fresh wool and is used for making cheap woolen garments and blankets.
Questions and answers for CBSE class 7 science Chapter 3 Fibre to Fabric Set-1
1. In the life cycle of silkworm, which stage comes before?
(a) Cocoon.
(b) Caterpillar.
(c) Cocoon with developing moth.
(d) Adult.
Answers:
(b)
Explanation: Eggs laid by female moth hatch larvae or caterpillars. They enter into the next stage called cocoon in which the caterpillar secretes fibre around its body. Inside this cocoon, moth starts developing.
Download the pdf of the Worksheet for class 7 Science Chapter 3 Fibre to Fabric
