(A) In most flowering plants (angiosperms),a single megaspore mother cell undergoes meiosis to produce four megaspores. Out of these,three degenerate,

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(A) In most flowering plants (angiosperms),a single megaspore mother cell undergoes meiosis to produce four megaspores. Out of these,three degenerate,and only one functional megaspore develops into a single embryo sac (also known as the female gametophyte). Therefore,the number of embryo sac in an ovule is generally one.