Question

Refer to the given dichotomous key and select the correct option.
I. (a) Fibre obtained from natural sources - Go to II
(b) Fibre obtained from chemical, - K
II. (a) It is a cellulosic fibre - Go to III
(b) It is a protein fibre. - Go to IV
III. (a) It is obtained from leaves. - L
(b) It is obtained from seeds.
IV. (a) It is obtained from mammals. - N
(b) It is obtained from an insect. - O

• A. Fabrics fibres K and N could be water proof.
• B. When fibres L and M are burnt separately they give smell of burning paper and burning hair, respectively.
• C. Fibre L is separated from leaves by retting process whereas from seeds by ginning process.
• D. N can be obtained from the same animal repeatedly whereas O can be obtained from source animal only once in its lifetime.

Answer 1

The correct option is A Fabrics fibres K and N could be water proof.

Fabrics fibers K and N are usually laminated to or coated with a waterproofing material such as rubber, polyvinyl chloride (PVC), polyurethane (PU), silicone elastomer, fluoropolymers, and wax

So, the correct option is 'Fabrics fibers K and N could be waterproof'.