Answer:
(c) The female gametophyte or embryo
sac is located inside the nucellus, enclosed within the integuments. In a
majority of flowering plants, one of the megaspore is functional while the
other three degenerate. Three repeated mitotic divisions of the functional megaspore
results in the formation of seven-celled or eight-nucleate embryo sac.
Six of the eight nuclei are organized at
the two poles. Three cells grouped at micro pylarend forms egg-apparatus and 3
at the chalazal end forms antipodal cells. The large central cell at the centre
has two polar nuclei.
The meiotic divisions in the
formation of embryo sac are strictly free nuclear, that is nuclear divisions
are not followed immediately by cell-wall formation. Gametophyte is situated at
micropylar end not at chalazal end.
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