The layer of pollen grain that exhibits a fascinating array of patterns and designs is

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made of cellulose and pectin.

a thin and continuous layer.

the inner wall of pollen grain.

made of most resistant organic matter.

answer is D.

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Detailed Solution

The exine exhibits a fascinating array of patterns and designs. It is made of most resistant organic matter, sporopollenin. It can withstand high temperatures and strong acids and alkali. No enzyme that degrades sporopollenin is so far known.

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