Question
Biology Question on sexual reproduction in flowering plants
One of the most resistant biological material present in the exine of pollen grain is
A
pectocellulose
B
sporopollenin
C
suberin
D
cellulose
Answer
sporopollenin
Explanation
Solution
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.