Why is the process of fertilisation in a flowering plant referred to as double fertilisation? Explain.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure**: In flowering plants, the reproductive structures are divided into male and female parts. The female reproductive part is called the gynoecium, which consists of the stigma, style, and ovary. The male reproductive part is called the androecium, which consists of the anther and filament.

2. **Pollen Grain Formation**: Pollen grains, which contain male gametes, are produced in the anther. When a pollen grain lands on the stigma, it germinates and forms a pollen tube.

3. **Pollen Tube Growth**: The pollen tube grows down through the style towards the ovary, reaching the micropyle, which is the opening in the ovule.

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