Generally,the number of integuments in the ovule of angiosperms and gymnosperms is:

Identify the labels $A, B, C,$ and $D$ in the given diagrams.

The normal or $Polygonum$ type of embryo sac is

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

Assertion: The megaspore mother cell divides mitotically to produce four spores.
Reason: Megaspore mother cells are diploid and megaspore is haploid.

...... surrounds the nucellus.