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Photosynthesis Background information The leaves are the part of a plant where most photosynthesis takes place. If you cut a leaf in half and look at the cut end, it would look like this: Key: 1. Waxy cuticle: this gives the leaf a waterproof layer, which lets in light. 2. Upper epidermis: provides an upper surface. 3. Palisade cells: contain chloroplasts. 4. Spongy mesophyll: collection of damp, loosely packed cells. 5. Lower epidermis: layer of cells on the lower surface. 6. Air space inside the leaf: allows contact between air and moist cell surfaces. 7. Stoma: a hole in the leaf through which gases diffuse. 8. Guard cells: change shape to close the stoma. One unique feature of leaves is that they have tiny holes in them to let carbon dioxide and oxygen enter and exit. The hole formed between these cells is called a stoma. A stoma is just a hole. It is controlled by two guard cells, which...

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