The epidermis of a plant leaf is usually many layers thick and carries out most of the photosynthesis in a leaf.

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The epidermis of a plant leaf is a single layer of cells that covers the surface of the leaf. Although it doesn't carry out photosynthesis, it plays a protective role in preventing water loss and regulating gas exchange. Most of the photosynthesis is carried out by the mesophyll cells, which make up the interior of the leaf.

The Epidermis of a Plant Leaf Is Usually Many Layers