SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Chloroplast. Illustration of the internal structure of a chloroplast, the organelle in plant cells responsible for photosynthesis. The perspective view (top) shows the outer (light green) and inner (dark green) membranes enclosing a fluid called stroma, and membrane structures called thylakoids (green) that form both grana (stacks) and lamellae (flat planes). It is the thykaloids that are the site of photosynthesis, the capturing of energy from sunlight using the green pigment chlorophyll. The sectioned view (bottom) shows a granule of starch (orange), a metabolic product of photosynthesis. For this artwork without labels, see image C023/8755.
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