embryo sac वाक्य
उदाहरण वाक्य
मोबाइल
- This entire structure with its eight nuclei is called the embryo sac.
- The embryo sac is of the " Fritillaria " type.
- Two polar nuclei are left in the central cell of the embryo sac.
- The megaspores become megagametophytes ( embryo sacs ).
- A typical embryo sac contains seven cells and eight nuclei, one of which is the egg cell.
- Oogenesis occurs within the embryo sac and leads to the formation of a single egg cell per ovule.
- In angiosperms, the megagametophyte is reduced to only a few nuclei and cells, and is sometimes called the embryo sac.
- In oaks, early fertilized ovules prevent the fertilization of other ovules by inhibiting the pollen tube entry into the embryo sac.
- This process involves the joining of a female gametophyte ( megagametophyte, also called the embryo sac ) with two male gametes ( sperm ).
- In flowering plants, the female gametophyte ( sometimes referred to as the embryo sac ) has been reduced to just eight cells inside the ovule.
- In flowering plants, the female gametophyte has been reduced to an eight-celled embryo sac within the ovule inside the ovary of the flower.
- One of these four cells ( megaspore ) then undergoes three successive mitotic divisions to produce an immature embryo sac ( megagametocyte ) with eight haploid nuclei.
- The megaspore undergoes several mitotic divisions to develop into a female gametophyte ( for example the seven-cell / eight-nuclei embryo sac in flowering plants ).
- Angiosperms have distinctive reproductive organs called flowers, with carpels, and the female gametophyte is greatly reduced to a female embryo sac, with as few as eight cells.
- Nalrix is the name of a water snake, given to a plant whose pollen tube discharges ciliated antherozoids which swim ( just like a water snake ) before entering the embryo sac.
- In flowering plants, the megagametophyte ( also referred to as the "'embryo sac "') is much smaller and typically consists of only seven cells and eight nuclei.
- It also should be borne in mind that every sexually reproducing extant species of vascular plant actually has an alternation of generations; the plants we see about us generally are megagametophytes ( the embryo sacs in the ovules ).
- Kimoto et al . ( 2006 ) suggest " Cassytha " should be placed in the Cryptocaryeae tribe because it shares a glandular anther tapetum and an embryo sac protruding from the nucellus with other members of the Cryptocaryeae.
- Apomixis ( reproduction via asexually formed seeds ) is found naturally in about 2.2 % of angiosperm genera One type of apomixis, gametophytic apomixis found in a dandelion species involves formation of an unreduced embryo sac due to incomplete meiosis ( apomeiosis ) and development of an embryo from the unreduced egg inside the embryo sac, without fertilization ( parthenogenesis ).
- Apomixis ( reproduction via asexually formed seeds ) is found naturally in about 2.2 % of angiosperm genera One type of apomixis, gametophytic apomixis found in a dandelion species involves formation of an unreduced embryo sac due to incomplete meiosis ( apomeiosis ) and development of an embryo from the unreduced egg inside the embryo sac, without fertilization ( parthenogenesis ).
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