B3.1 Gas exchange Quiz
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5 questions, one answer each
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1. Which keeps the water vapour gradient steep at a leaf surface?
- A. Still, humid air
- B. Air movement
- C. Closing stomata
- D. A thicker cuticle
2. Which muscles contract during normal inhalation?
- A. Internal intercostals and abdominal muscles
- B. External intercostals and diaphragm
- C. Abdominal muscles only
- D. Diaphragm relaxes, nothing contracts
3. HL: The S-shape of the oxygen dissociation curve is caused by:
- A. The Bohr shift
- B. Cooperative binding
- C. Surfactant
- D. Foetal haemoglobin
4. HL: Compared with adult haemoglobin, foetal haemoglobin:
- A. Has lower affinity for O₂
- B. Has higher affinity for O₂
- C. Cannot bind O₂
- D. Binds CO₂ at the haem
5. HL: An increase in CO₂ concentration causes haemoglobin to:
- A. Bind oxygen more tightly
- B. Release more oxygen
- C. Become fully saturated
- D. Change to foetal haemoglobin