Definations / Explanation :
$1.$ Embryo sac
$2.$ Monosporic development
Located in the nucellus is the embryo sac or female gametophyte. An ovule generally has a single embryo sac formed from a megaspore through reduction division.
This method of embryo sac formation from a single megaspore is termed monosporic development.
Egg apparatus of angiosperm consists of
In angiosperms, microsporogenesis andmegasporogenesis
The haploid cell which divides by mitosis to form embryosac is
The cells in embryo sac which act as haustoria are