The function of the innermost layer of the pollen sac,the tapetum,is:

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

Identify the layers of the microsporangium from the inside to the outside.

In pollen mother cells,cytokinesis during meiosis is:

The microspore tetrad of an angiosperm,at the time of formation,is surrounded by a callose wall. The breakdown of this wall is brought about by the enzyme callase,which is synthesized by the:

Identify the figure shown.