The number of germpore (aperture), structure and ornamentation of exine is a significant feature of
taxonomy.
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Explanation:
the 3, I have a look at the moment, but I
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Explanation:
→ 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 .
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