In pollen banks, pollen grains are stored at _______ ̊C temperature.

Q. [A]: Pollen grains are stored in liquid nitrogen.
[R]: Cryopreservation protects the viability of pollen.

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

Q. (a) Name the organic material of the exine of the pollen grain. How is this material advantageous to pollen grain?
(b) Still, it is observed that it does not form a continuous layer around the pollen grain. Give reason.
(c) How are 'pollen banks' useful?

Q. (a) Name the organic material which makes up exine of the pollen grain. How is this material advantageous to pollen grain?

(b) Still it is observed that it does not form a continuous layer around the pollen grain. Give reason.

(c) How are 'pollen banks' useful? [3]

Q. The pollen grains can be stored in a viable condition for many years in the following conditions.