Question

Name the organic materials that constitute the exine and intine of the angiospermic pollen grain Write the significance of exine.

Answer 1

1. The sporoderm is a two-layered wall found in angiospermic pollen grains.
2. The outer layer is exine, which is composed of sporopollenin, a complicated non-biodegradable substance.
3. The inner layer is made up of cellulose and pectin.
4. The exine is chemically resistant and has narrow sections called germ holes for emerging from the pollen tube.