Palisade mesophyll cells are closely sealed to soak maximum light. They are at right angles to the leaf surface to reduce the number of transverse walls. A large vacuole pushes the chloroplast to the edge of the cell.
Chloroplasts at the edge enable a shorter diffusion path for carbon dioxide and absorb maximum light. There are cylindrical cells and air spaces to provide a store of carbon dioxide. These cells provide a large surface area and moist cell surface for easy diffusion of gases. Chloroplasts in these cells can move towards light and move away from high light intensity to avoid damage.
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