The wall of the pollen tube is made up of:

In angiosperms,the four microspores of a tetrad are covered by a layer which is made up of:

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

Which part of the reproductive structure produces both enzymes and hormones?

Isobilateral tetrads are commonly found in........

Select the correct option in which the following terms are arranged in the correct developmental sequence:
$(A)$ Pollen grain
$(B)$ Pollen mother cell
$(C)$ Microspore tetrad
$(D)$ Male gametes
$(E)$ Sporogenous tissue