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IB Biology HL B2.1.3 Simple Diffusion Question Bank

Practise IB Biology HL B2.1.3 through questions that extend diffusion into rate comparisons, membrane properties and gas-exchange reasoning.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse concentration and membrane data to explain diffusion-rate comparisons and gas exchange.
  • Distinguish simple diffusion from active and facilitated transport in pneumocyte evidence.

B2.1.3—Simple diffusion question 1

[Maximum number: 1]

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

A

Active transport

B

Simple diffusion

C

Facilitated diffusion

D

Mass flow

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