Gce Model Questions Vol1 2025 Biology Question 1
Practice objective / multiple choice question 1 from the 2025 Gce Model Questions Vol1 Biology examination.
A desert cactus has evolved spines that reduce its effective photosynthetic surface area to 5 % of that of a typical leaf of the same overall size. Under standard conditions at 25 °C, a typical leaf loses water at a rate of \(0.12\ \text{g\,m}^{-2}\text{h}^{-1}\). The rate of water loss doubles for each 10 °C increase in temperature. If the ambient temperature is 35 °C and the total leaf‑equivalent area of the cactus is \(0.03\ \text{m}^2\), calculate the percentage reduction in water loss achieved by the cactus compared with a hypothetical leaf of the same total area that lacks spines.
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This is Gce Model Questions Vol1 2025 Biology Question 1. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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