alleryPollen grains can be stored for years in:
ADry ice at −78°C
BRefrigerator at 4°C
CLiquid nitrogen at −196°C
DBoiling water
Answer & Solution
Correct answer: C. Liquid nitrogen at −196°C
Pollen grains are routinely stored in **liquid nitrogen (−196°C)** for years — viable storage used as 'pollen banks' in crop breeding programmes, analogous to seed banks and semen banks.
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