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Updated on 12th July, 2023 , 3 min read
The egg apparatus is formed during the development of the embryo sac. The megaspore, which is the female gametophyte of the plant, undergoes three mitotic divisions to produce the seven-celled embryo sac. The egg apparatus is formed during the second mitotic division.
The egg apparatus is important for sexual reproduction in plants. The egg cell is fertilized by a pollen grain, and the resulting zygote develops into a new plant. The synergids and antipodal cells degenerate after fertilization.
Facts about the egg apparatus are as follows:
The egg apparatus consists of a group of three cells found at the micropylar end of a common angiosperm embryo sac. The three cells are:
Here are some additional functions of the egg apparatus:
The ploidy of the egg apparatus is (2n + 3n). This means that the egg cell and synergids are haploid (n), while the central cell is triploid (3n). Haploid cells contain one set of chromosomes, while diploid cells contain two sets of chromosomes. Triploid cells contain three sets of chromosomes. After fertilization, the haploid nucleus in the central cell fuses with one of the sperm nuclei from the pollen tube. This fusion creates a diploid nucleus, which then fuses with the other sperm nucleus. This fusion creates a triploid nucleus.
The triploid nucleus in the central cell then divides to form the endosperm, which is a tissue that provides nourishment for the developing embryo. The ploidy of the egg apparatus is important because it determines the ploidy of the endosperm. A triploid endosperm is necessary for the normal development of the embryo.
In some cases, the ploidy of the egg apparatus can be different. For example, in some species, the central cell may be tetraploid (four sets of chromosomes). In these cases, the endosperm will also be tetraploid. The ploidy of the egg apparatus is a complex and important topic in plant biology. It is still not fully understood how the ploidy of the egg apparatus is determined. However, research is ongoing to better understand this process.
The egg apparatus is situated at the micropylar end of a common angiosperm embryo sac. The micropyle is the opening at the tip of the ovule, which is where the pollen tube enters. The egg apparatus is located just inside the micropyle, and it is made up of three cells: the egg cell, two synergids, and the central cell.
The egg cell is the female gamete, and it is the largest cell in the egg apparatus. The synergids are two smaller cells that surround the egg cell, and they have a specialized structure called the filiform apparatus. The filiform apparatus helps to guide the pollen tube to the egg cell. The central cell is a large cell that is located between the synergids and the egg cell. It is binucleate, meaning that it contains two nuclei.
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By - Nikita Parmar 2023-08-25 09:48:44 , 11 min readThe egg apparatus consists of two synergids and one egg cell. The synergids are two small cells that surround the egg cell, and they have a specialized structure called the filiform apparatus. The filiform apparatus helps to guide the pollen tube to the egg cell. The egg cell is the female gamete, and it is the largest cell in the egg apparatus.
The egg apparatus in the female gametophyte consists of three cells: the egg cell, two synergids, and the central cell.
The egg apparatus is located at the micropylar end of the embryo sac. The micropyle is the opening at the tip of the ovule, which is where the pollen tube enters. The egg apparatus is located just inside the micropyle, and it is a critical part of the process of double fertilization, which is a unique feature of angiosperms. During double fertilization, one sperm nucleus fertilizes the egg cell, forming a zygote. The other sperm nucleus fertilizes the central cell, forming a triploid endosperm. The zygote develops into the embryo, while the endosperm provides nourishment for the developing embryo.
The egg apparatus is also called the female gametophyte. This is because it is the part of the plant that produces the female gametes, which are the egg cells. The egg apparatus is a critical part of the reproduction of angiosperms, and it plays a vital role in the development of the embryo and endosperm.
The antipodal cells are not part of the egg apparatus. The antipodal cells are three cells that are located at the chalazal end of the embryo sac. They are also haploid and contain one set of chromosomes. The antipodal cells are thought to play a role in regulating the development of the embryo sac, but their exact function is not fully understood.
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