DP Biology (first assessment 2025)

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Question SPM.1A.SL.TZ0.17

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.SL.TZ0.17
Level SL Paper 1A Time zone TZ0
Command term Question number 17 Adapted from N/A
17.
[Maximum mark: 1]
SPM.1A.SL.TZ0.17

What occurs at gas exchange surfaces in the lungs of mammals?


I.  Gases diffuse across a moist surface.
II.  Concentration gradients are maintained by ventilation.
III.  Water is lost.


A.  I and II only

B.  I and III only

C.  II and III only

D.  I, II and III

[1]

Markscheme

D

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