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

Answer and explanation

Correct answer: Sporopollenin

The exine is mainly made of sporopollenin, an exceptionally resistant biological polymer. It protects pollen from desiccation, decomposition, enzymes, and other environmental stresses during transfer from anther to stigma. The inner intine contains mainly cellulose and pectin. Cellulose, lignin, and chitin are therefore not the best answer for the principal material of the exine.

Related tags

BiologyExineSporopolleninFlowersMorphology Of Flowering PlantsClass 11 Mcq

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