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A-LevelBiologyTransport in mammalsMay/June 2022Paper 1 Q331 Mark

Which description of movement of substances during tissue fluid formation is correct?

ALow hydrostatic pressure forces substances out of the capillary at the arterial end allowing small substances to enter the fluid that bathes the cells.
BTissue fluid moves back into the venule due to a net hydrostatic pressure change in the capillary.
CMovement of water in tissue fluid into the capillary by osmosis is due to the low water potential and low hydrostatic pressure inside the capillary.
Dhigh water potential of the surrounding tissue fluid causes substances to leave the capillaries at the arterial end.

✓ Correct Answer

The correct answer is C: Movement of water in tissue fluid into the capillary by osmosis is due to the low water potential and low hydrostatic pressure inside the capillary.

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Biology Question

Topic

This multiple-choice question tests Transport in mammals in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2022 examination, Paper 1 Variant 2.

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