A-LevelBiologyTransport in plantsOct/Nov 2013Paper 1 Q231 Mark
A student used a potometer to measure the rate of water loss from a plant by transpiration. The internal diameter of the capillary tube and the distance moved by the bubble in 30 seconds were recorded. The results are shown in the table. [Figure 23.1] The volume of water moved = πr² x distance moved by the bubble. Which calculation correctly shows how to determine the rate of transpiration in mm³s⁻¹?
Aπ(1.8² × 40.0) / 30
Bπ(1.8² × 40.0) × 30
C30 / π(0.9² × 40.0)
Dπ(0.9² × 40.0) / 30
✓ 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...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep