Practice B3.1 Gas exchange with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
SLPaper 1A
Based on the movements shown in the diagram, what immediate effect will this have on the intrathoracic pressure and air movement?
Question 2
SLPaper 1A
As multicellular animals grow larger, which challenge most affects their ability to rely on simple diffusion for gas exchange?
Question 3
SLPaper 1A
What is the function of pulmonary surfactant in the alveoli?
Question 4
SLPaper 1A
What is a reason why it is not sufficient for large multicellular organisms to rely on diffusion across their body surface for gas exchange?
Question 5
SLPaper 1A
Why should stomatal counts be repeated in multiple fields of view?
Question 6
SLPaper 1A
What helps maintain a steep concentration gradient for gas exchange in the lungs?
Question 7
SLPaper 1A
What causes transpiration to occur in leaves?
Question 8
SLPaper 1A
Which factor would increase the rate of transpiration from a leaf?
Question 9
SLPaper 1A
During forced exhalation, which muscles are involved in pushing air out of the lungs?
Question 10
SLPaper 1A
In a dry, windy environment, which combination would result in the highest transpiration rate?
| Factor | Scenario A | Scenario B |
|---|---|---|
| Humidity | High | Low |
| Wind speed | Low | High |
| Stomata status | Closed | Open |