CBSE 2025, Set 1

Question

How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 50 microspore mother cells and 50 megaspore mother cells respectively? A). 100, 25 B). 200, 50 C). 50, 50 D). 200, 100

Edvaya · Accepted Answer

The correct answer is 200, 50. **SOLUTION** **For Microspores (Pollen Grains):** Each Microspore Mother Cell (MMC) undergoes meiosis to produce a tetrad of 4 functional microspores, which develop into 4 pollen grains. $50 	ext{ MMCs} 	imes 4 = 200 	ext{ pollen grains}$. **For Megaspores (Ovules):** Each Megaspore Mother Cell undergoes meiosis to produce 4 megaspores. However, in most angiosperms, 3 degenerate and only 1 remains functional to form the embryo sac within one ovule. $50 	ext{ Megaspore Mother Cells} 	imes 1 	ext{ functional megaspore} = 50 	ext{ ovules}$. Therefore, the correct count is **200, 50**.

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Biology > Reproduction And Genetics > Sexual Reproduction In Flowering Plants

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