Question
View answerSLPaper 1A
What is the function of pulmonary surfactant in the alveoli?
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What is the function of pulmonary surfactant in the alveoli?
Which leaf structure allows gas movement between mesophyll cells?
Which muscle is primarily responsible for increasing thoracic volume during inhalation?
Which tissue is correctly matched to its function in a dicot leaf?
How does the spongy mesophyll support gas exchange in plant leaves?
Practice IB Biology Topic B3.1 Gas Exchange with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for B3.1 Gas Exchange and mirrors Paper 1A, 1B, 2 style where relevant.
Get instant solutions, detailed explanations, and build confidence with questions aligned to IB examiner expectations.
| Tissue | Function |
|---|
| Spongy mesophyll | Gas diffusion through air spaces |
| Xylem | Photosynthesis |
| Lower epidermis | Water absorption |
| Palisade layer | Stomatal control |
