How many pollen sacs (microsporangia) does each lobe of an anther contain?

Given below are two statements.
Statement $I$: Generally,anthers in angiosperms are dithecous,having two pollen sacs in each lobe.
Statement $II$: Each sporangium produces pollens from sporogenous tissues by the process of sporogenesis.
In light of the above statements,select the correct answer from the options given below.

Which statement is correct regarding pollen grains?

Microsporangia develops into

Which plant part is most suitable for the study of meiosis?

The microsporophyll of an angiosperm is known as.......