Which types of cells undergo meiosis in a flower?

In multicellular organisms, life begins with a .......... .

Give differences: Male gametophytic stage and Female gametophytic stage.

Long silky hairs on the cob of maize are:

Select the correct option for the following statements:
$(i)$ In the embryo sac of angiosperms,the synergids and antipodals degenerate / do not degenerate after fertilization.
$(ii)$ In the leaves of dicotyledonous plants,parallel / reticulate venation is observed.

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