The odd one out is:

What is the number of chromosomes in a meiocyte of a potato plant?

Match the following:

Column-$I$	Column-$II$
$(1)$ Grasses	$(P)$ Prevent autogamy and geitonogamy
$(2)$ Hydrilla	$(Q)$ Wind pollination
$(3)$ Cleistogamous flower	$(R)$ Water pollination
$(4)$ Papaya	$(S)$ Autogamy

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Rarely among angiosperms,the pollen grains influence the endosperm. This is called as:

Choose the correct options for the following statements:
$1$. Autogamy is genetically xenogamy.
$2$. Pollination occurs by air in grass.
$3$. Placenta is arranged in the inner wall of the ovary.
$4$. It is possible to store pollen grains in liquid nitrogen at $-196^oC$.