megaspore वाक्य
उदाहरण वाक्य
मोबाइल
- Generally speaking, the megaspore, or large spore, germinates into a female gametophyte, which produces egg cells.
- During this time, the megaspore mother cell divides by meiosis to form four haploid cells, three of which degenerate.
- For example, in flowering plants, microspores ultimately produce microgametes ( sperm ) and megaspores ultimately produce megagametes ( eggs ).
- Distinctive characteristics of this species include brown-spotted sporangial walls and megaspores with highly reticulate ridges, producing a spiny effect.
- In organisms that are heterosporous, two types of spores occur : Microsporangia produce male microspores, and megasporangia produce female megaspores.
- In heterosporous vascular plants ( plants that produce both microspores and megaspores ), the gametophyte develops endosporically, within the spore wall.
- The megagametophyte develops within the megaspore of extant seedless vascular plants and within the megasporangium in a cone or flower in seed plants.
- "' Microspores "'are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes.
- Therefore, each pattern gives rise to a single functional megaspore which contains one, two, or four meiotic nuclei, respectively.
- In gymnosperms and most flowering plants, only one of the four megaspores is functional at maturity, and the other three soon degenerate.
- OPHA clade, species that are native to the American continent and have one type of sporophyll in the form of a megaspore network.
- The female gametophytes in the conelet develop so slowly that the megaspore does not go through free-nuclear divisions until autumn of the 3rd year.
- The tetrasporic pattern is characterized by cell plates failing to form after either meiosis 1 or 2, and results in one four-nucleate megaspore.
- One of these four cells ( megaspore ) then undergoes three successive mitotic divisions to produce an immature embryo sac ( megagametocyte ) with eight haploid nuclei.
- This pattern is characterized by cell plate formation after meiosis 1 & 2, which results in four one-nucleate megaspores, of which three degenerate.
- The bisporic pattern is characterized by cell plate formation only after meiosis 1, and results in two two-nucleate megaspores, of which one degenerates.
- The megaspore undergoes several mitotic divisions to develop into a female gametophyte ( for example the seven-cell / eight-nuclei embryo sac in flowering plants ).
- If so, " Aarabia " had megaspores and could be the earliest known plant with'heterospory', i . e . two distinct sizes of spore.
- They bear sporocarps of two types, either megasporangia that are few in number ( approximately 10 ), each with single megaspore, or many microsporangia, each with 64 microspores.
- These have creeping rhizomes, styles divided at their apices, and an embryo-sac of the " Polygonum "-type with a simple megaspore and triploid endosperm.
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