Which one of the following is resistant to enzyme action?

Options

(a) Cork
(b) Wood fibre
(c) Pollen exine
(d) Leaf cuticle

Correct Answer:

Pollen exine

Explanation:

Pollen exine is resistant to enzyme action. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. It can withstand high temperatures and strong acids and alkali. No enzymes that degrades sporopollenin is so far known.