EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Deadly nightshade leaf. Coloured scanning electron micrograph (SEM) of a section through a deadly nightshade (Atropa belladonna) leaf. Four chloroplasts (green) are seen across centre. Chloroplasts are the sites of photosynthesis, the process that synthesises carbohydrates from carbon dioxide and water using sunlight. The pigment responsible for photosynthesis, chlorophyll, is found on stacks of parallel thylakoids (green lines) called grana. Starch grains (grey) are seen within the chloroplasts. Magnification: x10,000 when printed at 10 centimetres wide.
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