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In most plants, the leaves contain the most chloroplasts and are the major sites of photosynthesis. Within a leaf, the chloroplasts are concentrated in the cells of the mesophyll, the inner layer of tissue (Figure 8-2).Figure 8-2Photosynthesis takes place in cellular organelles called chloroplasts. In this sunflower, the greatest numbers of chloroplasts are located in the leaves.ithin a leaf, the chloroplasts are concentrated in the cells of the mesophyll, the inner layer of tissue (Figure 8-2). Figure 8-2Photosynthesis takes place in cellular organelles called chloroplasts.
Function Chloroplasts are large organelles found in plants cells which are responsible for photosynthesis. Plants use photosynthesis to convert water and carbon dioxide into glucose. Chloroplasts are green because of the pigment chlorophyll. Plants can store other pigments in organelles similar to chloroplasts.