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2. During inspiration in a fish, what happens to the muscles in the mouth and the operculum

  • Mouth contract, opercular muscles contract
  • Mouth relaxes, opercular muscles contract
  • Mouth relaxes, opercular muscles relax
  • Mouth contracts, opercular muscles relax

3. Which of the following factors do not affect the rate of transpiration

  • concentration of nitrogen in the air
  • wind
  • light intensity
  • humidity

4. What is the Bohr effect

  • a decrease in the level of CO2 and acidity will cause Haemoglobin to unload oxygen
  • A decrease in the level of CO2 and an increae in the level of acidity will cause haemoglobin to unload oxygen
  • An increase in the level of CO2 and acidity will cause Haemoglobin to unload oxygen
  • An increase in the level of CO2 and a decrease in the level of acidity will cause haemoglobin to unload oxygen

5. Gas exchange in the gill happens on

  • The gill lamella
  • the gill arch
  • The operculum
  • the gill filaments
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