The typically angiosperm embryo sac is 8 nucleate but 7 cells explain in points
Answers
3 antipodals are present at chalazal end. (n)
2 synergids and 1 egg cell constitute the egg apparatus at micropylar end.
(n).
one polar nuclei (2n) lie in the central cell of embryo sac.
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Answer for Class 12 Biology Students
Development of embryo sac:
The nucleus of functional megaspore undergoes three mitotic divisions to form 8 nuclei.
These mitotic divisions are free nuclear, i.e., not followed immediately by cell wall formation.
After 8 nuclear stage, cell walls are laid down leading to organization of female gametophyte or embryo sac.
Three- cells are grouped together at the micropylar end and constitute egg apparatus. It consist of two synergids and one egg cell.
Synergids have special cellular thickening called filiform apparatus which plays important role in guiding the pollen tube into the embryo sac during fertilization.
3 cells at chalazal end are called antipodals.
A large central cell has 2 polar nuclei.
Thus a typical angiospermic embryo sac, at maturity is 8- nucleated and 7- celled structure.
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