(a) Draw a labelled diagram of the sectional view of microsporangium of an angiosperm.
(b) Explain the development of male gametophyte in the microsporangium.

Explanation

(b) Each cell of sporogenous tissue, gives rise to microspore mother cell. The process of formation of microspores from a pollen mother cell (PMC) through meiosis is called microsporogenesis. The microsopores as they are formed are arranged in a cluster of four cells, i.e., the microspore tetrad. At the 2-celled stage, the microspores dissociate form pollen grains (male gametophyte).