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Q.

Find the correct statement.

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a

Every ovule of angiosperms usually has more than one embryo sacs.

b

The most common type of embryo sac in angiosperms is tetrasporic with one mitotic generation of divisions.

c

In majority of angiosperms, egg cell of embryo sac has filiform apparatus.

d

Pollen grains can be preserved as fossils because of the presence of sporopollenin in exine.

answer is D.

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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 known. It can withstand high temperatures and strong acids and alkali. No enzyme that degrades sporopollenin is so far known. Pollen grains are well preserved as fossils because of the presence of sporopollenin.

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