Question

The hard, outer layer of pollen grain is made up of ?

Answer 1

Answer:

sporopollenin

Explanation:

The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic materials known.

Hope it helps you and mark me as brainliest plz!!!

Answer 2

Outer layer of pollen grains is exine.
It is made up of chemical called
sporo-pollenin.
Explanation:
1. Hardest material in the world is
sporo-pollenin.
2. It is unaffected by acid ,alkali or any
enzyme.
3. It helps in preservation of pollen
grains for long time in unfavorable
environmental conditions.