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<div>A leaf is a plant's principal organ of photosynthesis, the process by which sunlight is used to form foods from carbon dioxide and water.</div>
<div>A typical leaf is an outgrowth of a stem and has two main parts: the blade (flattened portion) and the petiole, the stalk connecting the blade to the stem.</div>
<div><b>Blade:</b> Flattened part of a leaf.</div>
<div><b>Chloroplasts:</b> Small structures that contain chlorophyll and in which the process of photosynthesis takes place.</div>
<div><b>Margin:</b> Outer edge of a blade.</div>
<div>leaf</div>