The diagram on the right shows what a leaf look like if you cut it across, and then look at the cut edge.

1. Waxy layer - it is on the leaf surface stops the leaf cells from drying out.

2. The upper epidermis- protects the cells inside the leaf.

3. The palisade layer -contains cells that do most of the photosynthesis.

4. The spongy layer has lots of air spaces . The cells in the spongy layer do a small amount of photosynthesis.

5. Stoma is a tiny hole in the lower epidermis. These holes let carbon dioxide from the air get into the leaf.

6. The lower epidermis protects the cells inside the leaf.

7. A vein carries water to the cells in the leaf.