Which is the female gametophyte in angiosperm?
Which is the female gametophyte in angiosperm?
embryo sac
The female gametophyte, also referred to as the embryo sac or megagametophyte, develops within the ovule, which, in turn, is embedded within the ovary of the carpel. Among angiosperms, the female gametophyte has a variety of forms.
What is tetrasporic Embryosac?
Hint: The Embryo sacs are haploid, egg-producing structures that constitute the female gametophyte. The tetrasporic embryo sac is formed from four megaspores nuclei. Complete Answer: – The megaspore is divided into four megaspores, that sometimes are not followed by the cytokinesis.
Which one of the following is the example of tetrasporic type of embryo sac?
It is also called the Allium type of embryo sac. Therefore, the correct answer is option B. Note: In the tetrasporic type of embryo sac, a single megaspore is formed after meiosis which contains 4 haploid nuclei. It is also called the Peperomia type of embryo sac.
Which female gametophyte type is most common and probably ancestral in the angiosperms?
haploid megaspore
The most common and presumably ancestral type of female gametophyte in the angiosperms is one that develops from the chalazal haploid megaspore, the result of monosporic megasporogenesis.
Is gametophyte a female?
The female gametophyte develops within the ovule and generally consists of three antipodal cells, one central cell, two synergid cells, and one egg cell (Figures 1A and 1B). The female gametophyte is also commonly called the embryo sac or megagametophyte.
What is female gametophyte in gymnosperms?
The female gametophyte of gymnosperms is a large and multicellular structure, and serves the double function of bearing the gametes as well as the nourishment of the developing embryo.
Is Megasporangium the same as Nucellus?
It is a small structure attached to the placenta by means of a stalk called funicle. Each has one or two protective envelopes called integuments. Nucellus is a mass of cells enclosed with in the integuments….Question : Megasporangium is equivalent to.
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What is the most common type of female gametophyte with eight nuclei?
The Amborella-type female gametophyte is restricted to a single extant species, Amborella trichopoda, and at maturity consists of eight cells and nine nuclei. Development of the Amborella-type game- tophyte is essentially identical to the Polygonum-type except that there is an additional and asynchronous cell division …
What are the 8 nuclei present in embryo sac?
Both the nuclei of the functional dyad take part in the formation of embryo sac. Each nucleus undergoes two mitotic divisions and the mature embryo sac is 8 nucleated. The eight nuclei are organised into antipodals, egg apparatus and polar nuclei as in Polygonum type of embryo sac.
Is ovule the female gametophyte?
What is the female gametophyte in gymnosperms called?
The megaspore mother cell divides by meiosis to produce four haploid megaspores. One of the megaspores divides to form the multicellular female gametophyte, while the others divide to form the rest of the structure. The female gametophyte is contained within a structure called the archegonium.
What is the female gametophyte called?
The female gametophyte is also commonly called the embryo sac or megagametophyte. The male gametophyte, also called the pollen grain or microgametophyte, develops within the anther and consists of two sperm cells encased within a vegetative cell (Gifford and Foster, 1989).
What is the function of the Angiosperm female gametophyte?
The angiosperm female gametophyte is critical to the reproductive process. It is the structure within which egg cell production and fertilization take place. In addition, the female gametophyte plays a role in pollen tube guidance, the induction of seed development, and the maternal control of seed development.
How many cells are in a female gametophyte?
These events result in a seven-celled structure consisting of three antipodal cells, one central cell, two synergid cells, and one egg cell (Figure 3). The monosporic, Polygonum type of female gametophyte is typically a seven-celled structure at maturity.
How many megaspores take part in the development of a gametophyte?
In the first, only one of the four megaspores takes part in the development of the gametophyte. It is most common. In the second, two megaspore nuclei take part in its formation; and in the third, all four of them.
How many megaspores are in a megaspore tetrad?
Megaspore tetrad developing from megaspore mother cell. In the first, only one of the four megaspores takes part in the development of the gametophyte. It is most common. In the second, two megaspore nuclei take part in its formation; and in the third, all four of them.
Which is the female gametophyte in angiosperm? embryo sac The female gametophyte, also referred to as the embryo sac or megagametophyte, develops within the ovule, which, in turn, is embedded within the ovary of the carpel. Among angiosperms, the female gametophyte has a variety of forms. What is tetrasporic Embryosac? Hint: The Embryo sacs are…