| (i) (a) It is a natural fibre. - Go to (ii) |
| (b) It is a man-made fibre. - [P] |
| (ii) (a) Fibre is obtained from plants. - Go to |
| (b) Fibre is obtained from animals. - Go to (iv) |
| (iii) (a) Fibre obtained from stem. - [O] |
| (b) Fibre obtained from seed. - [R] |
| (iv) (a) Fibre obtained by harming source organism - [S] |
| (b) Fibre obtained without harming source organism. - [T] |
A) Fibre P is quick burning and shrinks away from flame giving slightly sweet chemical odour.
B) Q could be obtained from Corchorus capsularis while R could be obtained from Gossypium hirsutum.
C) Fibre S is obtained from an insect whereas fibre T is obtained from a mammal.
D) Fabric made of S can be worn in all seasons whereas fibre Q can be used to make a raincoat.
Correct Answer: D
Solution :
According to the given dichotomous key, P is a synthetic fibre like polyester, Q could be jute, flax, etc. R is cotton, S is silk and T is wool.
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