Which element is required for the germination of pollen grains?

$A$ typical angiosperm anther is:

Male gametes are produced in

Consider the following statements and choose the correct answer from the given options.
$Statement \ 1$: Innermost layer of microsporangium is tapetum.
$Statement \ 2$: Cells of tapetum possess dense cytoplasm, more than one nucleus, and nourish the developing pollen grains.

How many meiotic divisions are necessary to produce $100$ pollen grains?

In flowering plants,the archesporium gives rise to.......