Minimises water loss through evaporation; thicker layer, Cell type with the highest concentration of chloroplasts; functions in photosynthesis, Transports water from the roots to all parts of the plant, Transports manufactured food substances from the leaf to all parts of the plants, Has a thin film of moisture on the external surface; functions in photosynthesis, Controls the size of the stoma, Allows for gaseous exchange when open, Minimises water loss through evaporation; thinner layer, Allows for rapid diffusion of gases into and out of mesophyll cells.

Cross-section of a leaf of dicotyledonous plant II

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