How many times does the nucleus of the functional megaspore divides and how many nuclei come into
existence ?
(A) Two times in succession and seven nuclei (B) Three times in succession and eight nuclei
(C) Four times in succession and nine nuclei (D) Five times in succession and nine nuclei
Answers
Answer:
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Answer:
ANSWER
The functional megaspore is the first cell of female gametophyte. The cell enlarges and undergoes three free nuclear mitotic division. The first division produces two nucleate embryo sac. The two nuclei shift to the two ends and divide twice forming four nucleate and then eight nucleate structure. One nucleus from each side moves to the middle, they are called polar nuclei. The remaining three nuclei form cells at the two ends, 3 celled egg apparatus at the micropylar end and three antipodal cells at the chalazal end. The middle binucleate part organise itself into central cell. Embryo sac developed from a single megaspore is called monsporic.
So, the correct answer is 'Megaspore divides twice to form an eight nucleate embryo sac'.