Light micrograph showing a section through a leaf. Each cell contains several round, green vescicles which are known as chloroplasts. These are the structures containing the green pigment chlorophyll and are largely found in most cells of green plants that are exposed to light. Chlorophyll is responsible for the absorption of light during photosynthesis. The pigment absorbs the red and blue-violet parts of sunlight but reflects the green, therefore giving plants their characteristic colour. Magnification: x250 at 35mm size.