Leaves absorb green light and so appear green in colour.

Explanation

**Step-by-Step Solution:**

1. **Understanding Chlorophyll**: Leaves contain chloroplasts, which are the organelles responsible for photosynthesis. Within these chloroplasts, there is a pigment called chlorophyll.

2. **Role of Chlorophyll**: Chlorophyll is crucial for photosynthesis as it absorbs light energy. It specifically absorbs light from the red and blue wavelengths of the light spectrum.

3. **Absorption and Reflection of Light**: While chlorophyll absorbs red and blue light, it does not absorb green light. Instead, it reflects green light.

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