Scientists compare two desert plants. Both have the same total leaf area.
| Plant | Water loss per hour in dry air / arbitrary units | Hours per day with stomata open |
|---|---|---|
| P | 4 | 6 |
| Q | 2 | 12 |
Assume water loss is negligible when stomata are closed and the rate stays constant while they are open.
Plant P is then exposed to stronger wind, which increases its hourly water loss by 50%.
Plant Q is unchanged.
Which change would allow P to keep its daily water loss equal to Q's?
Reduce its opening period by one-third, from 6 hours to 4 hours.
Reduce its opening period by one-half, from 6 hours to 3 hours.
Increase its opening period by one-third, from 6 hours to 8 hours.
Increase its opening period by one-half, from 6 hours to 9 hours.
63 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.