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how is the endosperm of angiosperms similar to the megagametophyte of gymnosperms? How do these tissues...

how is the endosperm of angiosperms similar to the megagametophyte of gymnosperms? How do these tissues differ?

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Answer #1

Similarities-

  • The basic similarity is in starting development. In case of both megagametophye of gymnosperm and endosperm of angiosperms, 1st of all Megaspore Mother cell is formed in nucellus.
  • Megaspore Mother cell undergo meiosis to form haploid megaspores.
  • Out of 4 megaspores, 3 degenerates and 1 remain functional.
  • This functional megaspore in both cases, increases in size.
  • Nucleus of Megaspore in gymnosperm divides mitotically by free nuclear divisions. Similarly nucleus of megaspore of angiosperms undergo 3 successive mitotic divisions.

Differences -

Megagametophye of gymnosperm represents endosperm.

  • Basic difference is that endosperm of gymnosperm is formed before fertilization while that of angiosperms is formed after fertilization.
  • Endosperm of gymnosperm is haploid and that of angiosperms is triploid.
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