megaspore
Americannoun
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the larger of the two kinds of spores characteristically produced by seed plants and a few fern allies, developing into a female gametophyte.
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the embryo sac of a flowering plant.
noun
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Also called: macrospore. the larger of the two types of spore produced by some spore-bearing plants, which develops into the female gametophyte Compare microspore
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the cell in flowering plants that gives rise to the embryo sac
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During the second phase, megagametogenesis, the surviving haploid megaspore undergoes mitosis to produce an eight-nucleate, seven-cell female gametophyte, also known as the megagametophyte or embryo sac.
From Textbooks ● Jan. 1, 2015
Only the large megaspore survives; it produces the female gametophyte, referred to as the embryo sac.
From Textbooks ● Jan. 1, 2015
The megaspore mother cell divides by meiosis to produce four haploid megaspores.
From Textbooks ● Jan. 1, 2015
When the pollen lands on a female scale, a pollen tube grows toward the female gametophyte, which consists of an ovule containing the megaspore.
From Textbooks ● Jan. 1, 2015
In Welwitschia also the megaspore is filled with prothallus-tissue, but single egg-cells take the place of archegonia.
From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" by Various
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