Across
- 2. - The process of breathing in oxygen and releasing carbon dioxide.
- 5. - Process by which plants use sunlight, water, and carbon dioxide to produce food and oxygen.
- 6. CELLS - Cells that surround stomata and control their opening and closing.
- 10. - Mixture of gases that we breathe in.
- 11. - Condition that allows for efficient gas exchange.
- 12. - Basic unit of life that carries out gas exchange.
- 13. - Gas that is essential for respiration and is released by plants during photosynthesis.
- 14. GRADIENT - Difference in concentration of a substance between two areas, which drives diffusion.
- 15. - Organelle in plant cells where photosynthesis takes place.
Down
- 1. - Muscle that helps with breathing.
- 3. - Pores on the surface of leaves that allow for gas exchange.
- 4. - The movement of molecules from an area of high concentration to an area of low concentration.
- 7. DIOXIDE - Gas released during respiration and used by plants for photosynthesis.
- 8. - Outer layer of cells that covers the surface of leaves and stems.
- 9. - Thin layer that surrounds cells and controls what enters and exits.