User Forum

Subject :NSO    Class : Class 6

Refer to the given dichotomous key and select the incorrect statement regarding P, Q, R, S and T.

(i) (A) It is a natural fibre.- Go to (ii)
(B) It is a man-made fibre. -
(ii) (A) Fibre is obtained from plants.
- Go to (iii)
(B) Fibre is obtained from animals.
- Go to (iv)
(iii) (A) Fibre obtained from stem. -
(B) Fibre obtained from seed. -
(iv) (A) Fibre obtained by harming source organism. -
(B) Fibre obtained without harming source organism. -

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.

Can't silk worn in all seasons???????????

Ans 1:

Class : Class 8
(D) is totally false . raincoat is made from plastic only which is a man made fiber .

Ans 2:

Class : Class 8
That is why Silk cannot be worn in all seasons

Ans 3:

Class : Class 7

Ans 4:

Class : Class 7

Ans 5:

Class : Class 6
D is false as silk cannot be worn in all seasons .

Ans 6:

Class : Class 8
Silk can't be worn in monsoon and winter, because it is not waterproof and it does not trap heat.

Ans 7:

Class : Class 6

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