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In the usual Polygonum type of embryo-sac development, how many of the four megaspores remain functional?

Answer and explanation

Correct answer: One

Meiosis of the megaspore mother cell produces four haploid megaspores. In the common Polygonum type, only one megaspore, generally the chalazal megaspore, remains functional. It undergoes three successive mitotic divisions to establish the typical eight-nucleate embryo sac. The other three megaspores degenerate, so the correct number is one.

Related tags

BiologyPolygonum TypeEmbryo SacFlowersMorphology Of Flowering PlantsClass 11 Mcq

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