The number of nuclei migrating from each of the micropylar quartet and chalazal quartet to the centre of the normal embryo sac is
One
Two
Four
Number not fixed
It’s obvious.
Definations / Explanation :
$1.$ Egg apparatus
$2.$ filiform apparatus
The ploidy level of nucellus and female gametophyte respectively is
The sequence of development of embryo sac is
$X$ – $MMC$ is a large cell containing dense cytoplasm and a prominent nucleus
$Y$ – Method of embryo sac formation from a single megaspore is termed monosporic
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