Waec Model Questions Vol1 2020 Biology Question 5

Practice objective / multiple choice question 5 from the 2020 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2020 Biology Objective / Multiple Choice Hard Difficulty
Question 5 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • objective

The photosynthetic rate of a shade‑tolerant leaf is described by P = a I (1 - e^{-kL}) - r L, where I is incident light intensity (µmol photons m⁻² s⁻¹), L is leaf thickness (mm), a = 0.02 µmol CO₂ µmol⁻¹ photons, k = 0.5 mm⁻¹, and r = 0.1 µmol CO₂ m⁻² s⁻¹ mm⁻¹. For I = 200 µmol photons m⁻² s⁻¹, find the leaf thickness L (mm) that maximizes P, and give the corresponding maximum photosynthetic rate (µmol CO₂ m⁻² s⁻¹).

Answer Options

A. L ≈4 mm; P_max ≈2.5 µmol CO₂ m⁻² s⁻¹
B. L ≈7 mm; P_max ≈3.0 µmol CO₂ m⁻² s⁻¹
C. L ≈5 mm; P_max ≈2.8 µmol CO₂ m⁻² s⁻¹
Correct Answer D. L ≈6 mm; P_max ≈3.2 µmol CO₂ m⁻² s⁻¹
Correct Answer
D
Correct Option:
L ≈6 mm; P_max ≈3.2 µmol CO₂ m⁻² s⁻¹

About This Question

This is Waec Model Questions Vol1 2020 Biology Question 5. It is a objective / multiple choice question from the 2020 Waec Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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