Which of the following wall layer of anther shows fibrous thickenings of callose?

Epidermis

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Tapetum

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Middle layer

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Endothecium

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Solution

The correct option is D Endothecium
The anther in angiosperms consists of four layers epidermis, endothecium, middle layer, and tapetum.
Before dehiscence of the anther, the endothecium develops a fibrous and thickened portion made of callose majorly.
This layer helps in anther dehiscence and pollen grain dispersal. Thus the correct answer is option D.

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