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Within a gymnosperm megasporangium, which of the following developmental sequences is correct, assuming fertilization occurs?

A. Formation of megaspores, development of the megagametophyte, fertilization, formation of the zygote.
B. Fertilization, formation of megaspores, development of the megagametophyte, formation of the zygote.
C. Development of the megagametophyte, formation of megaspores, fertilization, formation of the zygote.
D. Formation of the zygote, development of the megagametophyte, fertilization, formation of megaspores.



Answer :

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Final answer:

In gymnosperms, the developmental sequence within the megasporangium involves mitotic divisions, formation of the embryo sac, and development post-fertilization.


Explanation:

Developmental Sequence within a Gymnosperm Megasporangium:

  • The nucleus of the megaspore undergoes 3 mitotic divisions, resulting in 8 nuclei.
  • Nuclei are partitioned to form the embryo sac (mature female gametophyte).
  • Fertilization leads to the egg cell beginning the new sporophyte generation, involving synergid cells and central cell development into the endosperm.

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