Question

Why preservation of pollen grains is necessary?

Answer 1

Answer:

Sporopollenin is a substance which is very tough and resistant. This provides protection to the pollen grains from adverse conditions like high temperature, pH, etc. This helps to preserve the pollen grain and prevents from getting denatured for a long period of time.

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Explanation:

Answer 2

So as to carry out pollination experimental fertilisation at a time and date of ones choosing later on and thus viability can last for years if stores in liquid nitrogen