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Pollen grains can be stored for several years in liquid nitrogen having a temperature of

1. -120°C
2. -80°C
3. -160°C
4. -196°C

Correct answer: -196°C

Solution

Liquid nitrogen is used for cryopreservation because it maintains an extremely low temperature that prevents cellular and biochemical degradation. The standard temperature of liquid nitrogen is -196°C, which allows pollen grains to be stored for years.

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