Gas exchange · IB Biology SL
BiologyTopic B3.1P2
Gas exchange — IB Biology SL practice
Syllabus point B3.1 on Biology SL. Revise the topic, then upload your response for criterion-based marking — band-by-band feedback against official IB assessment criteria, not a generic AI grade.
Practice task
Biology — P2: Gas exchange Submit your work on "Gas exchange" for IB criterion-based examiner feedback. IB Biology SL — shorter responses with IB command terms. Paste your response below (essay extract, exhibition commentary, comparative analysis, reflection, etc.) or upload a photo of handwritten work.
Upload your answer for marking →IB Biology SL — shorter responses with IB command terms.
Frequently asked questions
- How do I practise IB Biology Gas exchange?
- Revise the free lesson on Gas exchange (B3.1), then submit your response for criterion-based marking. IB examiners use markbands — our /mark tool scores band-by-band against the official descriptors.
- What assessment criteria apply to Gas exchange?
- For IB Biology SL, marking uses: IB Biology SL — shorter responses with IB command terms.. Upload your work to see where your response sits in each band.
- Is Gas exchange (B3.1) free on MarkScheme?
- Criterion practice marking for Gas exchange is free on MarkScheme.