IB Biology SL B3.1 Gas Exchange Question Bank
Practise IB Biology SL B3.1 by applying diffusion, ventilation, concentration gradients, oxygen transport and transpiration to exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- link surface area, diffusion distance, permeability and moisture to efficient gas exchange
- explain how ventilation and blood flow maintain oxygen and carbon-dioxide gradients
- interpret spirometry and pressure-volume changes during inspiration and expiration
- explain stomatal control, leaf adaptations and environmental effects on transpiration
Covered syllabus points
B3.1.1—Gas exchange as vital functionB3.1.2—Properties of gas-exchange surfacesB3.1.3—Maintaining concentration gradientsB3.1.4—Mammalian lung adaptationsB3.1.5—Lung ventilationB3.1.6—Lung volume measurementsB3.1.7—Leaf gas exchange adaptationsB3.1.8—Leaf tissue distributionB3.1.9—TranspirationB3.1.10—Stomatal density
B3.1 Gas exchange question 1
Outline the process of gas exchange necessary for aerobic respiration in a unicellular eukaryotic organism.
B3.1 Gas exchange question 2
Emphysema is a condition where the alveoli of the lungs are destroyed, resulting in patients feeling out of breath. The micrograph shows air pockets resulting from emphysema.
What is a direct consequence of the destruction of alveoli?
A
Decrease in surface area for gas exchange
B
Increased blood flow to the lungs
C
Increase in pulmonary surfactant production
D
Decrease in ventilation rate
B3.1 Gas exchange question 3
Compounds of carbon, hydrogen and oxygen are used to supply and store energy.
Describe how a concentration gradient of oxygen is maintained between the lungs and blood capillaries.
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