Gce Model Questions Vol1 2017 Biology Question 6
Practice objective / multiple choice question 6 from the 2017 Gce Model Questions Vol1 Biology examination.
A cactus stem functions as a leaf. If a typical leaf of the same volume would have a surface area of 120 cm\(^2\), the cactus spine arrangement reduces the effective surface area by 60%. The cuticle on the cactus is three times thicker than that of a typical leaf, halving the water loss per unit area. In addition, the stomatal density is only 40% of that of a typical leaf, further reducing water loss proportionally. A typical leaf loses 0.8 mg of water per hour per cm\(^2\). Calculate the total water loss per hour from the cactus stem (in mg, to two decimal places).
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About This Question
This is Gce Model Questions Vol1 2017 Biology Question 6. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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