Igcse Model Questions Vol1 2025 Biology Question 26
Practice objective / multiple choice question 26 from the 2025 Igcse Model Questions Vol1 Biology examination.
Two desert plants, A and B, have leaf surface areas of 50 cm\(^2\) and 30 cm\(^2\) respectively. The stomatal density of plant A is 200 stomata\,mm\(^{-2}\) and that of plant B is 350 stomata\,mm\(^{-2}\). Each open stomata can transpire \(0.02\) µL of water per hour when fully open. Under midday conditions, 60 % of the stomata of plant A and 80 % of those of plant B are open. Calculate the total water loss per hour for each plant and determine which plant loses less water per unit leaf area. Express the ratio of water loss per unit leaf area (plant A : plant B) in its simplest integer form.
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This is Igcse Model Questions Vol1 2025 Biology Question 26. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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