A-LevelBiologyTransport in plantsMay/June 2013Paper 1 Q281 Mark
Halophytes are plants that can survive in regions where they are regularly exposed to sea water. Sea water has a water potential of approximately –2500 kPa. Which adaptation would you expect halophytes to show?
Aroot hair cells with a very high water potential
Broot hair cells which accumulate salts and other solutes
Chigh density of stomata that are open most of the time
Dleaves that have a large surface area and a thick cuticle
✓ Correct Answer
The correct answer is B: root hair cells which accumulate salts and other solutes
📋 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep