Gas exchange in plants

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Across
  1. 4. To open the stomata, guard cells become ______
  2. 6. These enable more efficient gas exchange
  3. 8. These cells use CO2 more than other cells
  4. 10. Where CO2 enters the plant for photosynthesis
  5. 12. The light __________ point is where increasing light intensity further does not increase rate of photosynthesis
  6. 13. How water leaves via the stomata
  7. 14. To close the stomata, guard cells become _______
  8. 15. The layer where most gas exchange takes place
Down
  1. 1. Prevents the evaporation of water from the upper epidermis
  2. 2. How O2 leaves the leaf
  3. 3. The ____________ point is where rate of PTS is equal to rate of respiration
  4. 5. The colour hydrogen carbonate indicator turns if photosynthesis rate is high
  5. 7. Where O2 exits the plant
  6. 9. These open and close the stomata
  7. 11. How water enters the guard cells
  8. 16. The colour hydrogen carbonate indicator turns in high CO2