The pollen viability period of rice and pea respectively,is

Match the following columns:

List-$I$	List-$II$
$(a)$ Stamen	$(i)$ Microsporangium
$(b)$ Pistil	$(ii)$ Microsporophyll
$(c)$ Anther	$(iii)$ Megasporangium
$(d)$ Ovule	$(iv)$ Megasporophyll

In $Paramecium$,both autogamy and conjugation are considered sexual processes because of:

Which of the following statements are true?
$P = \text{Papaver}$ has a multicarpellary syncarpous pistil.
$Q = \text{Endothecium}$ provides nourishment to the Microspore Mother Cell.
$R = \text{Commelina}$ has chasmogamous and cleistogamous flowers.

Given below are two statements:
Statement $I$: Cleistogamous flowers are invariably autogamous.
Statement $II$: Cleistogamy is disadvantageous as there is no chance for cross-pollination.
In the light of the above statements,choose the correct answer from the options given below:

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