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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.
Functions of the leaf. Chloroplasts chloroplast: Microscopic structure containing chlorophyl found in green plant cells where photosynthesis takes place. are the tiny structures in plant cells where photosynthesis happens. Chloroplasts contain chlorophyll chlorophyll: The green chemical inside the chloroplasts of plant cells.