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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.
  You can find chloroplasts throughout a plant, but the cells with the most chloroplasts are in the leaves. The root cells have the least chloroplasts, and their chloropla â¦ sts are also the least active, having no activity at all.2 people found this useful. Answered. In Biology.he leaf would have the most chloroplasts because it is the major  structure for photosynthesis in a plant.