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Get Answers to all your Questions
A typical angiosperm embryo sac at maturity:
Option: 1
8 - nucleate and 7-celled
Option: 2
7 - nucleate and 8-celled
Option: 3
7- nucleate and 7-celled
Option: 4
8 - nucleate and 8-celled
Answers (1)
Nucleus of functional megaspore divides by three mitotic divisions to form 8 nuclei, out of which
(i) Three of them get organised as cells at micropylar end forming egg appartus. One is egg cell (n) and two are synergids (n) or co-operative cells.
(ii) Three cells at chalazal end form antipodals (n) or vegetative cells of female gametophyte.
(iii) Two nuclei (one from each pole) in the centre are called polar nuclei (n).
As the mebryo sac matures, these polar nuclei get fused to form a secondary nucleus (2n) or definite nucleus.
This constitutes an embryo sac as 7-celled and 8-nucleated structure.
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