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Q.

Hardest substance in plant kingdom is

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a

sepal

b

corolla

c

sporopollenin

d

anther

answer is C.

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Detailed Solution

The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material and hardest substance in plant kingdom. It can withstand high temperatures and strong acids and alkali. No enzyme that degrades sporopollenin is so far known.

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