Which of the following statements is false regarding the exine of pollen grains?

In a pollen grain,the smaller cell with dense cytoplasm and a spindle-shaped nucleus is called the ....

Generally,how many middle layers are formed in the wall of the anther lobes?

Identify the labelled part $X$ from the figure:

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.

How many microsporangia are present in a typical angiosperm anther?