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 are two statements.
Statement $I$: Generally,anthers in angiosperms are dithecous,having two pollen sacs in each lobe.
Statement $II$: Each sporangium produces pollens from sporogenous tissues by the process of sporogenesis.
In light of the above statements,select the correct answer from the options given below.

The wall of the pollen tube is made up of:

...... possess dense cytoplasm and generally have more than one nucleus.

In which of the following does meiosis take place?

$A$ microsporophyll bears $.....$.