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Question
Embryo sac develops from megaspore mother cell through
Embryo sac develops from megaspore mother cell through
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Solution
The correct option is B 1 meiosis and 3 mitosis
Megaspore mother cell is developed inside the nucellus. It then undergoes one meiotic division to form four haploid megaspores. Out of these four megaspores, three degenerate and only one remains functional. This functional megaspore then undergoes mitosis three times without cytoplasmic divisions which results in 8 nuclei in the megaspore. These 8 nuclei then get organized into egg apparatus (consisting of an egg cell and two synergids), a large central cell and three antipodal cells. This results in the formation of a 7-celled but 8-nucleate structure which is called the embryo sac.Hence, the formation of embryo sac from megaspore mother cell involves 1 meiotic division and 3 mitotic divisions.So, the correct answer is B.
Megaspore mother cell is developed inside the nucellus. It then undergoes one meiotic division to form four haploid megaspores. Out of these four megaspores, three degenerate and only one remains functional. This functional megaspore then undergoes mitosis three times without cytoplasmic divisions which results in 8 nuclei in the megaspore. These 8 nuclei then get organized into egg apparatus (consisting of an egg cell and two synergids), a large central cell and three antipodal cells. This results in the formation of a 7-celled but 8-nucleate structure which is called the embryo sac.
Hence, the formation of embryo sac from megaspore mother cell involves 1 meiotic division and 3 mitotic divisions.
So, the correct answer is B.
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