Which of the following is incorrect in angiosperm?

How many meiotic divisions are required to produce $100$ seeds/grains of wheat?

How many reduction divisions are necessary for the formation of $200$ grains of wheat?

Provide information about pre-fertilization structures and events in flowering plants.

In castor and maize plants, . . . . . .

Indicate the stages where meiosis and mitosis occur $(1, 2$ or $3)$ in the flow chart: Megaspore mother cell $\xrightarrow{1}$ Megaspores $\xrightarrow{2}$ Embryo sac $\xrightarrow{3}$ Egg.