(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]

(a) Name the organic material which makes up exine of the pollen grain

1.	(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]
Answer» (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]