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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.
A: Chloroplasts are the organelles other than the nucleus and mitochondria that contain their own DNA. Chloroplasts are found in plants and certain forms of protists. Their DNA and ribosomes are located in the stroma. Chloroplasts are the site of photosynthesis in plants and contains the green pigment known as chlorophyll.