IB Biology SL B2.1.3 Simple Diffusion Question Bank
Practise IB Biology SL B2.1.3 through questions on concentration gradients, random movement and the factors that change diffusion rate.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain simple diffusion as passive net movement down a concentration gradient through membranes.
- Use concentration and membrane data to explain how diffusion rates change during gas exchange.
B2.1.3—Simple diffusion question 1
[Maximum number: 2]
Outline how molecules move across a membrane by simple diffusion.
a. membranes are porous/permeable allowing diffusion;
b. diffusion is (passive) movement (of particles) from high to low concentration;
c. due to random motion/kinetic energy of molecules / no ATP involved;
d. diffusion continues until concentrations are equal (across the membrane);
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