How many megasporangia do wind-pollinated flowers typically possess?

The number of embryo sac in an ovule is generally

In a haplontic life cycle,how many of the four haploid nuclei degenerate?

The arrangement of megaspores in a tetrad in a gymnosperm is:

Which of the following is not functionally analogous with others in the group?

The three cells present at the chalazal end form $.....P......$,and the three cells present at the micropylar end form $.....Q.....$.
$\quad\quad\quad \quad \text { P } \quad\quad\quad \text { Q }$