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A-LevelBiologyCell membranes and transportOct/Nov 2019Paper 1 Q191 Mark

Equal sized potato pieces were placed into a test-tube and covered with a sucrose solution. The test tube was left for 30 minutes. All other variables were controlled. After 30 minutes, the potato piece had not changed in size. What can be concluded from this result?

AThe concentration of sucrose is the same in the potato and in the solution and there is no more movement of water into or out of the potato.
BThe concentration of sucrose is the same in the potato and in the solution and there is no net movement of water into the potato.
CThe water potential is the same in the potato and in the sucrose solution and there is no more movement of water into or out of the potato.
DThe water potential is the same in the potato and in the sucrose solution and there is no net movement of water into or out of the potato.

✓ Correct Answer

The correct answer is D: The water potential is the same in the potato and in the sucrose solution and there is no net movement of water into or out of the potato.

📋 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 Cell membranes and transport in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2019 examination, Paper 1 Variant 2.

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