What is the role of sporopollenin?

Answer: Among the most innovative polymers is sporopollenin. It is a constituent of the external (solid) wall of plant seeds as well as pollen grains.

Sporopopollenin is found in the external wall or release of pollen grains. It represents one of the most innovative organic compounds ever discovered. Pollen grains are protected from foreign materials such as acid,heat, alkali, and so on. Pollen grains have been stored as residues as a result of sporopollenin. There is no enzyme known to reduce sporopollenin.