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Gas Exchange · Paper 1 — Free Biology SL Practice Questions

1FoundationMCQRespiratory structures in animals and plants1 markPaper 1~2 min

A leaf is sealed in a transparent container fitted with a CO₂ sensor. In bright light, the CO₂ concentration inside the container decreases at a steady rate. Which statement best explains this observation?

Solutions

2MasteryMCQRespiratory structures in animals and plants1 markPaper 1~2 min

In Cyprinus carpio, the

\text{pO}_2

of water entering the gills is

16 \text{ kPa}

and the

\text{pO}_2

of blood entering the gill capillaries is

4 \text{ kPa}

. Which statement best explains why countercurrent flow maintains a more favourable diffusion gradient for oxygen uptake than concurrent flow?

Solutions

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