Question

The most resistant organic substance which can withstand environmental extremes and cannot be degraded by any enzyme is

• A. Lignin
• B. Suberin
• C. Cutin
• D. Sporopollenin

Answer 1

The correct option is D Sporopollenin

Sporopollenin is found in outer layer or exine of pollen grains. It is extremely resistant and can withstand extremes of temperature presumably as an adaptation to protect the male gametophyte. The exine is weak at few points where sporopollenin is missing. These are germ pores from where pollen germinates that is, pollen tube protrudes out during germination.

So, the correct answer is 'Sporopollenin'