Sunday, 3 April 2016

TEXTBOOK ANSWERS AND SOLUTIONS OF CBSE CLASS VII SCIENCE Chapter 3 Fibre to Fabric



1) You must be familiar with the following nursery rhymes:
(i) Baa baa black sheep, have you any wool.
(ii) Mary had a little lamb, whose fleece was white as snow.
Answer the following:
(a) Which parts of the black sheep have wool?
(b) What is meant by the white fleece of the lamb?

ANSWER: -     (a) Wool is obtained from the hairy fibres (hair) of the sheep.
(b) White fleece of the lamb refers to the white coloured hair of the lamb.

2) The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.
(i) a (ii) b (iii) both a and b (iv) neither a nor b

ANSWER:-iii) both a and b

3) Which of the following does not yield wool?
(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog

ANSWER :-( iv) Woolly dog

4)What is meant by the following terms?
(i) Rearing (ii) Shearing (iii) Sericulture

ANSWER:-i) Rearing: Rearing means helping someone to grow up.
(ii) Shearing: It is the process of removal of fleece along with a thin layer of skin from the body of sheep.
(iii) Sericulture: Sericulture refers to the rearing of silkworms to obtain silk.

5) Given below is a sequence of stepsbin the processing of wool. Which are the missing steps? Add them. Shearing, __________, sorting, __________,__________, __________

ANSWER:-Shearing, scouring, sorting, picking of burrs, dying of fibres, making of yarn

7) Out of the following, which are the two terms related to silk production? Sericulture, floriculture, moriculture, apiculture and silviculture

Hints: (i) Silk production involves cultivation of mulberry leaves and rearing silkworms.
(ii) Scientific name of mulberry is Morus Alba.

ANSWER:-Sericulture and moriculture






8) Match the words of Column I with those given in Column II :

ANSWER:-
Column I                                  Column II
(i) Scouring                  (e) Cleaning sheared skin
(ii) Mulberry leaves     (c) Food of silk worm
(iii) Yak                       (b) Wool yielding animal
(iv) Cocoon                 (a) Yields silk fibres



Written By Badal Paul
The author is a passionate blogger, writer and educationalist. This blog is created to ease troubles of the Cbse students. The author holds multiple blogs and the writer of the Novel KALCHAKRA, OOM AND THE CHOSEN FIVE.