Megaspores are produced from the megaspore mother cells after
mitotic division
formation of thick wall
differentiation
meiotic division.
Draw the diagram of a mature embryo sac and show its $8-$ nucleate, $7-$ celled nature. Show the following parts : antipodals, synergids, egg, central cell, polar nuclei.
$A$- Four cells are at the chalzal end and are called the antipodals.
$R -$ A typical angiosperm embryo sac, at maturity,though $8$-nucleate is $7$-celled
Describe about pistil (gynoecium).
Definations / Explanation :
$1.$ Nucellus
$2.$ Funicle