Waec Model Questions Vol1 2023 Biology Question 25
Practice objective / multiple choice question 25 from the 2023 Waec Model Questions Vol1 Biology examination.
A xerophytic plant normally has a leaf‑area index (LAI) of 5. During a drought its stomatal conductance per unit LAI falls by 20 % from the normal value of 0.8 mmol m⁻² s⁻¹ kPa⁻¹. The ambient vapor‑pressure deficit (VPD) remains constant at 2 kPa. To avoid excessive water loss the plant must keep its total transpiration rate at or below 10 mmol m⁻² s⁻¹. What is the greatest LAI the plant can retain under these conditions? (Give your answer to two decimal places.)
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This is Waec Model Questions Vol1 2023 Biology Question 25. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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