AIIMS 2018 Botany Ploidy Levels MCQ Question
Ploidy level of Nucellus, endosperm, polar nuclei, Megaspore mother cell, female gametophyte respectively are
2n, 3n, n, 2n, n
2n, 3n, 2n, n, n
n, 2n, n, 2n, n
2n, 3n, 2n, 2n, n
Correct Answer
Detailed Explanation
In angiosperms, the nucellus is diploid (2n) as it is part of the ovule, while the endosperm, formed from the fusion of one sperm cell with two polar nuclei, is triploid (3n). The polar nuclei are haploid (n), and the megaspore mother cell, which undergoes meiosis to produce the female gametophyte, is diploid (2n). The female gametophyte itself, also known as the embryo sac, is haploid (n). Other options incorrectly assign ploidy levels, such as suggesting the polar nuclei or megaspore mother cell are diploid, which does not align with their biological roles in reproduction.
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