Two chief functions of leaves are

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(B) The two primary functions of leaves are photosynthesis and transpiration.Photosynthesis is the process by which green plants synthesize food using

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Photosynthesis and transpiration

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(B) The two primary functions of leaves are photosynthesis and transpiration.Photosynthesis is the process by which green plants synthesize food using $CO_2$ and $H_2O$ in the presence of sunlight,releasing $O_2$ as a byproduct.Transpiration is the evaporative loss of water from the aerial parts of the plant,which helps in the absorption and upward movement of water and minerals,and also plays a role in cooling the plant surface.

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