In flowering plants during double fertilization, two events take place in the embryo sac namely .........and..........

Answer

**Step-by-Step Solution:**

1. **Understanding Double Fertilization**: In flowering plants, double fertilization is a unique process that involves two fertilization events occurring within the embryo sac.

2. **Identifying the Structure**: The embryo sac, which is the female gametophyte, contains several important structures:
- Three antipodal cells at the chalazal end.
- Two synergids and one egg cell at the micropilar end.
- A central cell containing two polar nuclei.

3. **Entry of Pollen Tube**: The pollen tube enters the embryo sac from the micropilar end. It carries two male gametes (sperm cells).

4. **First Fertilization Event (Syngamy)**:
- One of the male gametes fuses with the egg cell.
- This fusion results in the formation of a zygote, which is the first fertilization event known as **syngamy**.

5. **Second Fertilization Event (Triple Fusion)**:
- The second male gamete fuses with the central cell, which contains the two polar nuclei.
- This fusion leads to the formation of the endosperm, a process referred to as **triple fusion** because it involves the fusion of three nuclei (one male gamete and two polar nuclei).

6. **Conclusion**: Therefore, during double fertilization in flowering plants, the two events that take place in the embryo sac are **syngamy** and **triple fusion**.

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