Leaves

2. Stomata can be opened and closed by _____ cells
3. support leaf structure and carry substances to and from all the cells in the leaf
5. Tubes that take dissolved food away.
8. It absorbs light and it is green
11. a waterproof layer in the leaf that also cuts down the water lost by evaporation
14. Water passes into the guard cells by _____
15. Leaves have a thin shape so that _____ may diffuse in and out easily
16. Leaves have a large ______ area to absorb light rays

1. _____ dioxide diffuses in for photosynthesis
4. The _____ layer is made up of more rounded cells with lots of air spaces between them. Gas exchange occurs here.
6. The time of the day when stomata close
7. The lower _____ has lots of tiny holes called stomata. Stomata allow gases to diffuse in and out.
9. Where photosynthesis takes place
10. Small holes on the underside of the leaf that let gases diffuse in and out.
12. This gas is made in photosynthesis and it diffuses out of the leaf.
13. Tubes that bring water and salts to the leaf