What causes the green colour of plant leaves?

The green colour of plant leaves is due to the presence of chlorophyll, a pigment that plays a crucial role in photosynthesis. Chlorophyll absorbs light primarily from the red and blue parts of the light spectrum but reflects green light, giving leaves their characteristic colour. This pigment is essential for converting sunlight into energy, which plants use to produce food. Chlorophyll also helps in protecting the plant from excess sunlight, allowing for efficient energy absorption.