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a
PEN undergoes nuclear divisions and wall formation simultaneously.
b
PEN undergoes successive nuclear divisions to give rise to free nuclei.
c
first division is followed by a transverse wall resulting in a micropylar and a chalazal chamber.
d
it is a very rare type of endosperm.
answer is B.
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Detailed Solution
In free-nuclear endosperm PEN undergoes successive nuclear divisions to give rise to free nuclei. It is a common type of endosperm formation.On the other hand in helobial type of endosperm first division is followed by a transverse wall resulting in a micropylar and a chalazal chamber.