megagametophyte वाक्य
उदाहरण वाक्य
मोबाइल
- The megagametophyte is of the " Polygonum " type.
- The megagametophytes of endosporic plants such as the angiosperms today.
- The pollen tube proceeds to release the two sperm in the megagametophyte.
- These would germinate to form microgametophytes and megagametophytes, respectively.
- The megaspores become megagametophytes ( embryo sacs ).
- This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.
- The first seed plants, megagametophyte remains inside the megasporangium, attached to the parent plant.
- Inside the ovary / ovaries are one or more ovules where the megagametophyte contains the egg cell.
- Then, the megagametophyte is contained within a waterproof integument, which forms the bulk of the seed.
- Since the protection of the megagametophyte is evolutionarily desirable, probably many separate groups evolved protective encasements independently.
- In gymnosperms the megagametophyte consists of several thousand cells and produces one to several archegonia, each with a single egg cell.
- In angiosperms, the megagametophyte is reduced to only a few nuclei and cells, and is sometimes called the embryo sac.
- The megagametophyte develops within the megaspore of extant seedless vascular plants and within the megasporangium in a cone or flower in seed plants.
- Megagametophytes and microgametophytes protruding through sporangium wall; megagametophytes floating on water surface with archegonia directed downward; microgametophytes remaining fixed to sporangium wall.
- Megagametophytes and microgametophytes protruding through sporangium wall; megagametophytes floating on water surface with archegonia directed downward; microgametophytes remaining fixed to sporangium wall.
- This process involves the joining of a female gametophyte ( megagametophyte, also called the embryo sac ) with two male gametes ( sperm ).
- After pollination, a tube grows from the pollen through the stigma into the ovary to the ovule and two sperm are transferred from the pollen to the megagametophyte.
- Embryo and megagametophyte are soft and translucent at first; later the endosperm becomes firm and milky white, while the embryo becomes cream-colored or light yellow.
- This double fertilization is unique to flowering plants, although in some other groups the second sperm cell does fuse with another cell in the megagametophyte to produce a second embryo.
- The microgametophyte a pollen grain which has germinated from a microspore is employed for dispersal, only releasing its desiccation-prone sperm when it reaches a receptive megagametophyte.
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