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Question

Pollen grain of large number of species can be stored in

A
Liquid carbon dioxide
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B
Liquid nitrogen
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C
Liquid sulphur dioxide
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D
Liquid oxygen
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Solution

The correct option is B Liquid nitrogen
Pollen grain consists of hard covering of exine but their viability may lost with time. For Hybridisation pollen grains are collected and stored in liquid nitrogen below -196 degree Celsius temperature.

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