Pollen banks
A : Store pollen grain in liquid nitrogen
B : Are centers for storage of pollen grains for various artificial plant breeding programs.

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Only (B) is correct.

Both (A) and (B) are incorrect.

Both (A) and (B) are correct

Only (A) is correct.

answer is C.

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Detailed Solution

It is possible to store pollen grains of a large number of species for years in liquid nitrogen (-196⁰C). Such stored pollen can be used as pollen banks, similar to seed banks, in crop breeding programs.

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