What is most commonly observed in plants bearing bisexual flowers?

Identify the plant parts that consist of two generations,one within the other:
$(a)$ Pollen grains inside the anther
$(b)$ Germinated pollen grain with two male gametes
$(c)$ Seed inside the fruit
$(d)$ Embryo sac inside the ovule

Which of the following statements is incorrect?

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

The probability of fruit set in a self-pollinated bisexual flower of a plant is far greater than in a dioecious plant. Explain.

Which one of the following statements is correct?