1
Question
Which one is resistant to enzyme action?
Which one is resistant to enzyme action?
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Solution
The correct option is D Pollen exine
Exine of pollen
Pollen exine is the outer layer of pollen grain. It is composed of an organic compound sporopollenin which makes it resistant to enzymes, acids, alkalis and high temperatures. Exine is not present in germ pores, because through which the pollen tube emerges during pollen germination.
Leaf cuticle
The leaf cuticle is composed of cutin and wax. It is prone to enzyme action.
Cork
Cork in plants is mainly made up of suberin. It is prone to enzyme action.
Wood fibre
Wood fibers are generally made up of cellulose. It is prone to enzyme action. For example, the cellulase enzyme.
Final answer
(a) Pollen exine
Exine of pollen
Pollen exine is the outer layer of pollen grain. It is composed of an organic compound sporopollenin which makes it resistant to enzymes, acids, alkalis and high temperatures. Exine is not present in germ pores, because through which the pollen tube emerges during pollen germination.
Leaf cuticle
The leaf cuticle is composed of cutin and wax. It is prone to enzyme action.
Cork
Cork in plants is mainly made up of suberin. It is prone to enzyme action.
Wood fibre
Wood fibers are generally made up of cellulose. It is prone to enzyme action. For example, the cellulase enzyme.
Final answer
(a) Pollen exine
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