Exine of pollen grain is made up of...

Exine of pollen grain is made up of

Sporopollenin

Pectin

Cellulose

2 & 3 both

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Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

Identify the pair of wrong statements I. Intine of pollen grains is made up of sporopollenin, II.l 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 temperature, strong acids and alkali

pollen grains

Intine of pollen grain is made of

Which one of the following statements is not true? (a) Stored pollen in liquid nitrogen can be used in the crop breeding programme (b) Tapetum helps in dehiscence of anthers (c) Exine of pollen grains is made of sporopollenin (d) Pollen grains of many species cause severe allergies

(a) Name the organic material exine of the pollen grain is made up of. 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 ?

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Exine of pollen grain is made up of
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