A-LevelBiologyTransport in plantsMay/June 2020Paper 1 Q271 Mark
Which changes occur as carbohydrates move out of a root cell into a phloem sieve tube? [Figure 27.1]
Awater potential in a phloem sieve tube becomes: less negative, volume of liquid in phloem sieve tube: decreases
Bwater potential in a phloem sieve tube becomes: less negative, volume of liquid in phloem sieve tube: increases
Cwater potential in a phloem sieve tube becomes: more negative, volume of liquid in phloem sieve tube: decreases
Dwater potential in a phloem sieve tube becomes: more negative, volume of liquid in phloem sieve tube: increases
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of transport in plants within the Biologysyllabus. The examiner's mark scheme requires...
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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...
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