What are the 7 cells in a female gametophyte?
What are the 7 cells in a female gametophyte?
At FG6/FG7, the mature female gametophyte has seven cells: two synergids, egg cell, central cell with large diploid nucleus (central cell nucleus, or CCN), and three antipodal cells (which are present through FG7 though much diminished 8). Stages are numbered in accordance with Christensen et al. 4.
How many divisions are required to form 7 celled 8 nucleated embryo sac from a Megaspore?
three mitotic divisions
Complete answer: It undergoes three mitotic divisions successively to form an 8 nucleated embryo sac which on maturation appears as 7 celled 8 nucleated embryo sac.
What are the seven cells present in the embryo sac?
The mature embryo sac consists of four cell types; the egg cell, synergids, antipodal cells and polar nuclei. After fertilization egg cell transforms into embryos, antipodal and synergid cells gets degenerated. And polar nuclei give rise to the triploid endosperm.
How many cells are formed in female gametophyte?
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 the first cell of female gametophyte?
Functional megaspores
Megaspore mother cell of megasporangium undergoes meiosis. It forms megaspore tetrad out of which one megaspore is functional. Functional megaspores develop mitotically into the embryo sac. So, the functional megaspore serves as the first cell of the female gametophyte.
How are the eight cells placed in an embryo sac name them?
After maturity, an embryo sac has eight nucleate and seven celled structures. These seven cells are distributed in the embryo sac. The three cells are located at the micropylar end, three cells at the opposite side of the micropylar end that is at the chalazal end and two polar nuclei at the middle of the embryo sac.
How is 7 celled 8 nucleated embryo sac formed?
The flanking cells are known as synergids and have finger-like projections on the wall which forms filiform apparatus. Three cells present at the chalazal end of embryo sac are called as antipodals. The large central cell has two polar nuclei. This makes embryo sac 7 celled and 8 nucleate structure.
Is the structure having 7 cells and 8 nucleus *?
The embryo sac in female gametophyte is seven cells and eight nucleated structure.
How are the eight cells placed in an embryo sac?
How many cells are formed in a mature female gametophyte a eight B six C Two D seven?
There are usually 8 haploid cells in the female gametophyte of a flowering plant: 3 antipodal cells (at the opposite end of the embryo sac from the egg)
How many cells are present in flowering plants?
There are 7 cells in the embryo sac of a flowering plant. They are the three antipodals, one central cell, two synergids and one egg. During fertilization, pollen tube having two male gametes enter through the micropyle.
Which is the first cell of female gametophyte generation in angiosperms?
How many nucleate female gametophytes of flowering plants are there?
With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte. Hard Open in App Solution Verified by Toppr The eight nucleate female gametophytes of flowering plants have an egg apparatus made of one egg cell and two flanking cells at the micropylar end.
What is the female gametophyte also known as?
With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte. Hint: The female gametophyte is also called the embryo sac, or megagametophyte. The female gametophyte develops within the ovule.
How many egg cells are present in female gametophyte?
The eight nucleate female gametophytes of flowering plants have an egg apparatus made of one egg cell and two flanking cells at the micropylar end. The flanking cells are known as synergids and have finger-like projections on the wall which forms filiform apparatus.
Why is the polarity of the female gametophyte important for fertilization?
Within the female gametophyte, the egg and synergid cells occupy the micropylar pole and the antipodal cells lie at the chalazal pole. This polarity is important for fertilization because the pollen tube reaches the female gametophyte by growing through the micropyle (discussed below).