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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.
The role of chloroplasts in photosynthesis is mainly to contain most of the reaction during photosynthesis. The plant will pump water into the leaves, and the leaves will also absorb carbon dioxide. All of the thylakoids, chlorophyll, water, carbon dioxide, etc. are available inside the chloroplast. The entire process of photosynthesis starts and completes inside of the chloroplast.