Question

Define exine???

Give more points on it.
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Answer 1

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

→ 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 .

Answer 2

$\huge\bigstar\underline\mathfrak{Answer:-}$

➡Exine is defined as the decay-resistant outer coating of a pollen grain or spore.

➡The exine is composed of the most durable organic polymer known, sporopollenin, also called extine.

➡Exine is a hard outer layer made up of sporopollenin which is the most resistant organic material known.

➡Exine help in protection of pollen from physiological conditions.