Angiosperm double fertilization is so-called because it features the formation of

Options

A. Two embryos from one egg and two sperm cells
B. One embryo from one egg fertilized by two sperm cells.
C. Two embryos from two sperm cells and two eggs.
D. One embryo involving one sperm cell and an endosperm involving a second sperm cell.

Answer

**Step-by-Step Solution:**

1. **Understanding Double Fertilization:**
- In angiosperms, the process of double fertilization involves the fusion of two male gametes (sperm cells) with different structures in the female gametophyte (embryo sac).

2. **Components of the Embryo Sac:**
- The embryo sac contains:
- One egg cell (female gamete).
- Two polar nuclei located in the central cell.
- Two synergids and three antipodal cells.

3. **Process of Fertilization:**
- When the pollen tube reaches the embryo sac, it releases two sperm cells.
- One sperm cell fuses with the egg cell to form a zygote, which will develop into an embryo.

4. **Formation of Endosperm:**
- The second sperm cell fuses with the two polar nuclei in the central cell. This fusion forms a triploid cell known as the endosperm, which provides nourishment to the developing embryo.

5. **Conclusion:**
- Therefore, double fertilization in angiosperms is characterized by the formation of one zygote (embryo) from one sperm cell and one triploid endosperm from the second sperm cell. This is why it is called "double fertilization."

**Final Statement:**
- Angiosperm double fertilization is so-called because it features the formation of one embryo (from the fusion of one sperm cell with the egg cell) and one endosperm (from the fusion of the second sperm cell with the two polar nuclei).

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