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.
As multicellular animals grow larger, which challenge most affects their ability to rely on simple diffusion for gas exchange?
What is the function of pulmonary surfactant in the alveoli?
Why should stomatal counts be repeated in multiple fields of view?
What helps maintain a steep concentration gradient for gas exchange in the lungs?
What causes transpiration to occur in leaves?
Which factor would increase the rate of transpiration from a leaf?
During forced exhalation, which muscles are involved in pushing air out of the lungs?
Based on the movements shown in the diagram, what immediate effect will this have on the intrathoracic pressure and air movement?
What is a reason why it is not sufficient for large multicellular organisms to rely on diffusion across their body surface for gas exchange?
The table shows factors that affect the rate of transpiration in two scenarios, A and B.
| Factor | Scenario A | Scenario B |
|---|---|---|
| Humidity | High | Low |
| Wind speed | Low | High |
| Stomata status | Closed | Open |
Which combination would result in the highest rate of transpiration?
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.
As multicellular animals grow larger, which challenge most affects their ability to rely on simple diffusion for gas exchange?
What is the function of pulmonary surfactant in the alveoli?
Why should stomatal counts be repeated in multiple fields of view?
What helps maintain a steep concentration gradient for gas exchange in the lungs?
What causes transpiration to occur in leaves?
Which factor would increase the rate of transpiration from a leaf?
During forced exhalation, which muscles are involved in pushing air out of the lungs?
Based on the movements shown in the diagram, what immediate effect will this have on the intrathoracic pressure and air movement?
What is a reason why it is not sufficient for large multicellular organisms to rely on diffusion across their body surface for gas exchange?
The table shows factors that affect the rate of transpiration in two scenarios, A and B.
| Factor | Scenario A | Scenario B |
|---|---|---|
| Humidity | High | Low |
| Wind speed | Low | High |
| Stomata status | Closed | Open |
Which combination would result in the highest rate of transpiration?