Question

Pollen viability can be extended for years by storing pollen grains in

• A. Liquid nitrogen at - ${196}^0$ C
• B. Liquid nitrogen at - ${96}^0$ C
• C. Liquid nitrogen at - ${169}^0$ C
• D. Liquid nitrogen at -${100}^0$ C

Answer 1

The correct option is A

Liquid nitrogen at - ${196}^0$ C

It is possible to store pollen grains of a large number of species for years in liquid nitrogen at -${196}^0$C. Such stored pollen can be used as pollen banks, similar to seed banks, in crop breeding programmes.