Write the significance of double fertilization .

Explanation

**Step-by-Step Solution:**

1. **Definition of Double Fertilization**: Double fertilization is a unique process that occurs in angiosperms (flowering plants) where two male gametes from the pollen grain fertilize two different structures in the ovule.

2. **Process of Double Fertilization**:
- One male gamete fuses with the egg cell to form the zygote. This process is known as **syngamy**.
- The second male gamete fuses with the central cell of the embryo sac, which is diploid, to form the **primary endosperm nucleus**. This process is referred to as **triple fusion** because it involves three nuclei (two from the male gamete and one from the central cell).

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