2. The anther at the top of the stamen has _
contain numerous microspore mother cells that undergo meiosis to produce

              Anther contain saclike structure called microsporangia that have micrspores mother cells that develop in to male gametophyte

Explanation:

                     Sporangia cosist of microspores mother cells and megaspores mother cells in land plant that develops in to male and female gametophyte respectivelly. Then latter on the male gametophyte gie rise to male gametes and female gmetophyte give rise to female gametes and after fusion of the gametes an other gametophyte is arise which give rise to sporophyte and thr sporophyte give rise to gametophtye which is called alternation of generation.

nucleus

would be most reasonable answer tbh