Which of the following plant parts consist of two generations - one within the other?

Which one of the following is an example of cleistogamy?

Product of sexual reproduction generally generates:

Study the following statements and select the correct option:
$(i)$ Tapetum nourishes the developing pollen grains.
$(ii)$ Hilum represents the junction between the ovule and the funicle.
$(iii)$ In aquatic plants such as Water hyacinth and Water lily,pollination occurs by water.
$(iv)$ The primary endosperm nucleus is haploid.

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

Assertion $(A)$: Death is a meaningful event.
Reason $(R)$: Death limits the number of individuals of each species and returns the materials of the body,formed by life elements,back to the environment.