$A$ schematic illustration of the pollen grain is called

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

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

What is the number of cells or nuclei present in the male gametophyte of Capsella?

The mature male gametophyte in angiosperms is typically composed of how many cells?

Pollen grains are well preserved as fossils because of the presence of . . . . . . .