Page 1 - 4 -HOME ASSIGNMENT 1- (OBJECTVE & SUBJECTIVE)

SAI International School
Class – VII
Subject – Chemistry
Topic – Animal Fibres

Sub-Topic – Silk, Lifecycle of Silk moth, processing of Silk
HOME ASSIGNMENT
OBJECTIVE:

S.L Questions Mark Skill
No.
Q.1 Which of the following is the first stage of silkworm’s 1 R
life- cycle
a) Larva b) Pupa c) Silk moth d) Eggs
Q.2
Process of cultivating silkworms and extracting silk from 1 K
them is called as a) Silk agriculture b) Raw silk producer c)
Sericulture
d)Cocoon producer

Q.3 Larvae shed their skin in four times. This process is called 1 R
as
a) Moulting. b) Shedding c) Reeling d) Filature
Q.4 The process of obtaining silk threads by soaking cocoons 1 A
in hot water is called
a) Reeling or filature. b)) Moulting c) Shedding d)
Dyeing
Q.5 ........................ is called artificial silk. 1 U
a) Nylon b) Polyester c) Rayon d) cotton
Q.6 ......................... is the world’s leading producer of silk. 1 K
a) India b)U.S.A c) China d) U. k
Q.7 ..................... stage of life cycle of silk moth produce 1 U
cocoon.
a) Egg b) Larva c) Silk moth d) Pupa
For Assertion& Reason question follow the following directions.
DIRECTION: Each of these questions contains an Assertion
followed by Reason. Read them carefully and answer the question
on the basis of following options. You have to select the one that
best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the
correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the
correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.
Q.8 Assertion: Rayon is called artificial silk 1 U
Reason: It is obtained from wood pulp.
Q.9 Assertion: Silk is called as royal fabric. 1 U

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