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B
Transfer cells
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C
Membrane of megaspore
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D
Membrane of egg
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Solution
The correct option is C Membrane of megaspore
Embryo sac is formed from megaspore. The megaspore enlarges and its nucleus divides mitotically to form two daughter nuclei which further undergo 2 mitotic divisions to form 8 nuclei. These 8 nuclei then get arranged in egg apparatus, central cell and antipodal cells to form a 7-celled but 8-nucleate structure, the embryo sac.
Since, embryo sac is formed within the megaspore, it is surrounded by the wall which infact is the membrane of the megaspore.