The male gametophyte with the least number of cells is present in:

What will be the amount of $DNA$ in a pollen grain if its mother cell has $32 \; pg$ $DNA$ in $G_2$ phase (in $; pg$)?

Among the following statements related to pollens, choose the correct one.
Statement $I$: In $40\%$ of angiosperms, pollen grains are shed at the $3$-celled stage.
Statement $II$: Intine is made of cellulose and pectin, and it is discontinuous with germ pores.

Examine the figure given below and select the right option identifying all the four parts $a, b, c$ and $d$.

Tapetum is a part of

$A$ plant that develops directly from a pollen grain is called ....