Waec Model Questions Vol1 2023 Biology Question 48

Practice objective / multiple choice question 48 from the 2023 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 48 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

A forest ecosystem records a gross primary productivity (GPP) of 2000 g C·m⁻²·yr⁻¹, autotrophic respiration (R_a) of 800 g C·m⁻²·yr⁻¹ and heterotrophic respiration (R_h) of 600 g C·m⁻²·yr⁻¹.\n(a) Calculate the net ecosystem productivity (NEP) in g C·m⁻²·yr⁻¹.\n(b) If 30% of the NEP is exported as carbon to an adjacent ecosystem, how much carbon (in g C·m⁻²·yr⁻¹) remains stored in the forest?\n(c) The forest covers 1500 ha. Determine the total amount of carbon stored annually in the forest (in tonnes).

Answer Options

A. NEP = 500 g C·m⁻²·yr⁻¹; carbon retained = 350 g C·m⁻²·yr⁻¹; total stored carbon = 5250 tonnes per year
Correct Answer B. NEP = 600 g C·m⁻²·yr⁻¹; carbon retained = 420 g C·m⁻²·yr⁻¹; total stored carbon = 6300 tonnes per year
C. NEP = 600 g C·m⁻²·yr⁻¹; carbon retained = 300 g C·m⁻²·yr⁻¹; total stored carbon = 4500 tonnes per year
D. NEP = 800 g C·m⁻²·yr⁻¹; carbon retained = 560 g C·m⁻²·yr⁻¹; total stored carbon = 8400 tonnes per year
Correct Answer
B
Correct Option:
NEP = 600 g C·m⁻²·yr⁻¹; carbon retained = 420 g C·m⁻²·yr⁻¹; total stored carbon = 6300 tonnes per year

About This Question

This is Waec Model Questions Vol1 2023 Biology Question 48. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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