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Option 3 : Ovules
The correct answer is Ovules:
About Embryo Sac:
- The "Embryo Sac" or "Female Gametophyte" is an Oval shape in structure. It is present in the (Ovule of Flowering Plants).
- The (Ovule in Plants) is a structure that encloses the (Reproductive cells in Females) which contains the (Nucleus), the Female Gametophyte, and the Integument.
- It is said to form when the (Haploid Megaspore Nucleus divides). It possesses {two(2) Haploid Nuclei and six(6) Haploid cells} which do not have (Cell Walls).
- In some of the cases, the (Haploid Nuclei) combines to form a single cell called (Endosperm Motor Cell). At the time of (Fertilization), {one Male Nucleus and Egg nucleus} combine for the formation of (Zygote) which leads to the development of the (Embryo).
- Let's look at the steps how The Formation of Embryo Sac takes place inside the ovule:
- In the first stage of the formation, (Megasporogenesis) occurs, where the (Haploid Megaspore Tetrad forms due to the Meiosis of a single Diploid of the Mother cell).
- Out of this, {Three (3) disintegrates, and one (1)} survive, which later develops into the Embryo sac inside the ovules.
- Now, the second stage of formation, the (Megagametogenesis part), where the {Embryo sac} is formed due to (Mitosis of the functional Haploid Megaspore to produce Eight(8)-Nucleate and Seven(7)-celled Gametophyte).
- The Polar Nuclei move to the center out of all the Eight (8) Nuclei, to combine and generate a {Single Diploid cell at that (center)}.
- Then, the (Single Diploid cell then fuses with the Sperm to generate the Triploid endosperm). The other (three (3) Nuclei grow into Antipodal Cells), while {two (2) other cells modify into Synergid cells} which degenerate gradually.
Image of the Embryo Sac formation:
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