IB Biology HL B2.1.3 Simple Diffusion Questions

Analyse how concentration gradients and random kinetic motion drive passive diffusion, then identify oxygen or carbon dioxide crossing directly through the bilayer in IB Biology…

Exam points

Define simple diffusion as passive net movement of particles down a concentration gradient using random kinetic motion, without ATP or transport proteins.
Explain how a steeper concentration gradient increases the rate of simple diffusion until net movement stops at equilibrium.
Identify small non-polar molecules such as oxygen and carbon dioxide that cross directly through the phospholipid bilayer by simple diffusion.

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Study B2.1.3—Simple diffusion conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Which process results in the exchange of gases across the membrane of pneumocytes?

Active transport

Simple diffusion

Facilitated diffusion

Mass flow

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IB Biology HL B2.1.3 Simple Diffusion Questions question 1