Leaf

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A leaf is an above-ground plant organ. Its main functions are photosynthesis and gas exchange. Leaves are often flat to absorb the most sunlight and thin to allow the sunlight to fully penetrate the chloroplasts in its cells. Most leaves have stomata, which open and close, to regulate carbon dioxide, oxygen, and water vapor exchange with the atmosphere.

Fallen leaves from deciduous plants are used to make leaf mold.