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.
Frequently asked questions
What is the correct answer to this question?
One
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 11 Biology question. Chapter: Morphology of Flowering Plants. Topic: flowers.
