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A-LevelBiologyTransport in plantsOct/Nov 2009Paper 1 Q251 Mark

What is the sequence of events in the translocation of assimilates?

Aactive loading of sucrose into sieve elements via companion cells at the source, in hydrostatic pressure, mass flow, unloading at the sink
Bhydrolysis of storage compounds in sinks, lowered water potential in sink, unloading o sucrose from sieve elements down the water potential gradient, mass flow from the source
Clowered pressure in sieve elements at the source, movement of sucrose down the pressure gradient from companion cells, mass flow down a diffusion gradient to the sink
Dmass flow of dissolved sucrose via companion cells into the sieve element at the source, lowered hydrostatic pressure, diffusion of sucrose down concentration gradient to sink, active unloading

✓ Correct Answer

The correct answer is A: active loading of sucrose into sieve elements via companion cells at the source, in hydrostatic pressure, mass flow, unloading at the sink

📋 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 plants in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2009 examination, Paper 1 Variant 2.

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