(A) In angiosperms,each microspore mother cell $(MMC)$ undergoes meiosis to produce $4$ microspores (pollen grains).Therefore,the number of $MMC$ requ

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(A) In angiosperms,each microspore mother cell $(MMC)$ undergoes meiosis to produce $4$ microspores (pollen grains).Therefore,the number of $MMC$ required to produce $n$ pollen grains is calculated as $n / 4$.For $100$ pollen grains,the number of $MMC$ required = $100 / 4 = 25$.Thus,$25$ microspore mother cells are needed.