IB Biology SL B3.1.1 Gas Exchange As Vital Function Questions

Explore how aerobic organisms take up oxygen and release carbon dioxide by diffusion, and how ventilation differs from gas exchange and cell respiration in IB Biology SL B3.1.1.

Exam points

Distinguish ventilation, gas exchange and cell respiration as separate processes in an aerobic organism.
Explain that oxygen enters and carbon dioxide leaves cells by passive diffusion down concentration gradients.

[Maximum number: 3]

Outline the process of gas exchange necessary for aerobic respiration in a unicellular eukaryotic organism.

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a	oxygen must be taken up AND carbon dioxide must be released
b	gases pass through a cell membrane by simple diffusion
c	require a concentration gradient; OR pass from high concentration to low concentration
d	without requiring energy; OR passive process
e	large SA: vol ratio

IB Biology SL B3.1.1 Gas Exchange As Vital Function Questions question 1