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  4. Select the correct option regarding the ploidy level of different structures of an angiospermous ovule. Nucellus MMC Functional megaspore (a) n 2n 2n (b) 2n n n (c) 2n 2n n (d) n 2n n

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Q. Select the correct option regarding the ploidy level of different structures of an angiospermous ovule.
Nucellus MMC Functional megaspore
(a) n 2n 2n
(b) 2n n n
(c) 2n 2n n
(d) n 2n n

Sexual Reproduction in Flowering Plants

Solution:

The body of the ovule consists of a mass of parenchymatous cells named nucellus. It is equivalent to megasporangium ($2n$). Megaspore mother cell or megasporocyte is a diploid ($2n$) cell which undergoes meiosis to form a linear tetrad of four haploid megaspores ($n$). Normally, the chalazal megaspore is the functional megaspore while the other three degenerate.