In angiosperms,all four microspores of a microspore tetrad are covered by a layer which is made up of ........

Complete the following flow chart:
Pollen Mother cell $\to$ Pollen tetrad $\to$ Pollen grain $\to$ Vegetative cell
Pollen Mother cell $\to$ Pollen tetrad $\to$ Pollen grain $\to$ ..........

Which of the following represents the male reproductive organ of a flower?

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

Which cell is involved in the formation of the pollen tube?

The intine of pollen grains is composed of