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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.
Chloroplast. Photosynthesis occurs in eukaryotic cell structures called chloroplasts. A chloroplast is a type of plant cell organelle known as a plastid. Plastids assist in storing and harvesting needed substances for energy production. A chloroplast contains a green pigment called chlorophyll, which absorbs light energy for photosynthesis. Hence, the name chloroplast indicates that these structures are chlorophyll containing plastids. Like mitochondria, chloroplasts have their own DNA, are responsible for energy production, and reproduce independently from the rest of the cell through a division process similar to bacterial binary fission.