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#angiosperm

2 public questions tagged with this topic.

Sexual Reproduction in flowering Plants

A typical angiosperm embryo sac at maturity is described as '7-celled and 8-nucleate'. Which of the following cells are

In the embryo sac, the Egg cell, Synergids, and Antipodals are all derived from the haploid megaspore via mitosis, so they are haploid (n). The Central cell contains two polar nuclei (n+n) before fertilization. The Zygote (2n) and Primary Endosperm Nucleus (3n) are post-fertilization structures.

Ref: Diagram of a mature embryo sac showing the egg apparatus, central cell, and antipodals.

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Sexual Reproduction in flowering Plants

In the majority of angiosperms, the functional megaspore develops into the embryo sac. What is the ploidy sequence of th

The Nucellus is part of the sporophyte (2n). The Megaspore Mother Cell (MMC) differentiates from the nucellus and is also diploid (2n). The MMC undergoes meiosis to form megaspores (n). The functional megaspore (n) divides mitotically to form the female gametophyte (n).

Ref: Diagram of an ovule showing the nucellus surrounding the MMC and subsequent reduction division.

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