Question

The number of germpore (aperture), structure and ornamentation of exine is a significant feature of
taxonomy.
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Answer 1

Explanation:

the 3, I have a look at the moment, but I

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 .