What is the significance of double fertilisation?

Explanation

### Step-by-Step Solution:

1. **Understanding Double Fertilization**:
- Double fertilization is a unique process in flowering plants where one female gamete (egg) fuses with two male gametes (sperm).
- This results in the formation of two structures: the zygote and the primary endosperm nucleus (PEN).

2. **Formation of Zygote**:
- One male gamete fuses with the egg cell to form the zygote.
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