Question

why do you think exine should be hard and what is the function of germ pore​

Answer 1

Yes 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. Through germ pore pollen tube develops and comes out.

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Answer 2

Explanation:

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

→ 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 .