One of the most resistant biological material present in the exine of pollen grain is

Options

A. pectocellulose
B. sporopollenin
C. suberin
D. cellulose

Answer

B

Explanation

Outer layer (exine) of pollen grain is made of a highly resistant substance called sporopollenin. Sporopollenin is not degraded by any enzyme. It is not affected by high temperature, strong acid or strong alkali. Because of sporopollenin, pollen grains are well preserved as fossils.