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The innermost wall layer of anther:

The figure below shows a three-dimensional view of an anther. Identify $P$ and $Q$.
$\quad\quad\quad\quad \quad P \quad\quad\quad\quad Q$

Given below is the diagrammatic sketch of a transverse section of a young anther. Identify the parts labelled $A, B, C$ and $D$ and select the right option about them.

Exine of pollen grains is composed of

In over $60\%$ of angiosperms,pollen grains are shed at the $2$-celled stage. In less than $40\%$ of angiosperms,pollen grains are shed at the $3$-celled stage.

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