Why is the fertilization in angiosperms called double fertilization? What is meant by triple fusion?

Explanation

### Step-by-Step Solution

1. **Understanding Fertilization in Angiosperms**:
- Fertilization in angiosperms (flowering plants) is termed "double fertilization" because it involves the fusion of two male gametes with different cells in the female gametophyte.

2. **What is Double Fertilization?**:
- In double fertilization, one male gamete fuses with the egg cell to form the zygote, which will develop into the embryo.
- The second male gamete fuses with two polar nuclei in the central cell to form the triploid endosperm, which serves as a food reserve for the developing embryo.
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