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B
Megaspore
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C
Tetrad
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D
Nucellus
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Solution
The correct option is D Microspore Microspores are land plant spores that develop into male gametophytes. Microspores are structures that are part of the alternation of generations in many seedless vascular cryptogams, all gymnosperms and all angiosperms. Microspores are halpoid and are produced from diploid microsporocytes by meiosis.