anther has 2 lobes . each lobe has 2 theca n each theca has 2 microsporangium .. then there should be 6 microsporangium ... but there are 4 ... where am I going wrong ?

A typical angiosperm anther has two parts, an anther and a slender, thread like filament. Each anther is a bilobed structure, i.e., it has two lobes, and each lobe is dithecous i.e., has two theca. Each theca has a mass of sporogenous tissue which develops into microsporangium or pollen sac. Thus, there are two lobes, each with two theca, and each theca has one microsporangium. In total, there are four microsporangia in an anther.

A typical angiospermic anther is bilobed with each lobe having two theca in which cells develop to form the microsporangium which further develops to form the pollen sac. Thus there are two microsporangia in a lobe, i.e, one in each theca making a total of four microsporangia in both the lobes.

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Sana Abdulla answered this

THERE R 2 LOBES IN AN ANTHER .....AND EACH LOBE CONSISTS OF 2 THECA....AS ANTHER IS A 4 SIDED STRUCTURE IT HAS 4 CORNERS...AND AT EACH CORNER THERE IS MICROSPORANGIUM....SO EACH LOBE WILL HAVE 2 MICROSPORANGIUM...SO IN TOTAL THERE ARE 4 MICROSPORANGIUM....
I HOPE THIS WILL HELP.....