If the cells of the root in a wheat plant have $42$ chromosomes,then the number of chromosomes in the cell of a pollen grain is:

Haploids can be obtained from

$A$ typical angiosperm anther is:

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.

What is the function of the germ pore?

Which are the three cells found in a pollen grain when it is shed at the three-celled stage?