Question

Why exine is hard and what is the role of germ pore

Answer 1

exine should be hard because it protects pollen grain (by which pollen grain develops normally) from severe conditions. It is the outermost layer made up of sporopollenin which protects pollen grain from harsh environmental conditions.

On a spore or pollen grain, a thin-walled area through which the germ tube or pollen tube emerges on germination. The thin or absent exine at the germ pore helps in the identification of some pollen grains.

Hope this helps you...gud luck...

Answer 2

$\tt\pink{\underline{Exine}}$

→ It age outer layer of pollen grain and very hard.

→ It age made up of sporopollenin in which is most resistance organic material present in nature .

→Sporopollenin is Resistance to high temperatures stronger acids and alkaline and also to enzyme .