Biology topic 3

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Across
  1. 4. on gill filaments to increase surface area
  2. 5. many in companion cells lining the phloem to provide ATP for active transport
  3. 7. what is opened by guard cells
  4. 10. key word for blood and water flowing in opposite directions in a fish
  5. 12. transports sugars in a plant
  6. 14. water molecules stick to the wall of the xylem because they are
  7. 16. what are pores on an insects called
  8. 18. what flattens and contracts when breathing in
  9. 19. used in photosynthesis 1 reaction is catalysed by rubisco
  10. 20. .... of thoracic cavity increases when breathing in
Down
  1. 1. increases rate of gas exchange
  2. 2. what does the countercurrent flow maintain
  3. 3. transports water in a plant
  4. 6. oxygen diffuses through alveoli epithelium through capillary ...... into the blood
  5. 8. many of them increase rate of gas exchange in human lungs
  6. 9. produced by respiration to provide energy
  7. 11. water molecules move up the xylem in a continues column because water molecules are .....
  8. 13. adaptation in plant that are in dry environments
  9. 15. process of water leaving leaves as water vapour
  10. 17. cell open stomata