Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain?

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. (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.

The most resistant organic material present in the exine of pollen grains is:

Q. Two mark Questions:
Name the organic materials the exine and intine of an angiosperm pollen grains are made up of. Explain the role of exine.

Q. Read the following statements and identify the wrong pair.

$i$. Intine of pollen grains is made up of sporopollenin
$ii$. Pollen grains are well preserved as fossils because of the presence of sporopollenin
$iii$. Enzymes can degrade the organic material of the pollen grain exine
$iv$. Sporopollenin can withstand high temperatures, strong acids and alkalis.