In angiosperms,the embryo sac is formed from | vedclass

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(A) In angiosperms,the process of formation of megaspores from the megaspore mother cell $(MMC)$ is called megasporogenesis. $1$. The $MMC$ undergoes

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Megaspore mother cell

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(A) In angiosperms,the process of formation of megaspores from the megaspore mother cell $(MMC)$ is called megasporogenesis. $1$. The $MMC$ undergoes meiosis to produce four haploid megaspores. $2$. In most flowering plants,three megaspores degenerate,and only one functional megaspore develops into the embryo sac (female gametophyte). $3$. Therefore,the embryo sac is derived from the functional megaspore,which originates from the megaspore mother cell $(MMC)$.

In angiosperms,the embryo sac is formed from which of the following?

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