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The outer wall of a pollen grain, called the exine, is mainly composed of which substance?

Answer and explanation

Correct answer: Sporopollenin

Sporopollenin is the main material of the pollen exine and is highly resistant to decomposition, desiccation, enzymes, and environmental stress. This durable layer protects pollen during transport. Germ pores are regions where exine is thin or absent, allowing the pollen tube to emerge. Cellulose and pectin are associated mainly with the intine, not the exine.

Related tags

BiologySporopolleninPollen WallFlowersMorphology Of Flowering PlantsClass 11 Mcq

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