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An Intiative by Sri Chaitanya
a
Pollen grains are generally spherical measuring about 25-50 micrometers in diameter
b
Pollen grains are well preserved as fossils because of the presence of sporopollenin
c
The cytoplasm of pollen grain is surrounded by a plasma-membrane
d
The pollen grains represent the male gametes in the flowering plants
answer is D.
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