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Solution


Q.

Pollen grains can be stored for several years in liquid nitrogen having a temperature of                 [2018]
1 –120°C   
2 –80°C  
3 –196°C   
4 –160°C  

Ans.

(3)

Pollen grains can be stored for several years in liquid nitrogen at -196°C. This is also known as cryopreservation.