Gce Model Questions Vol1 2023 Biology Question 23

Practice objective / multiple choice question 23 from the 2023 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 23 GCE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

An isolated lake covers an area of \(2\ \text{km}^2\). Solar irradiance provides \(1.5\ \text{MJ\,m}^{-2}\) of energy each day. Primary production in the lake converts \(5\%\) of the incident solar energy into phytoplankton biomass (assume an energy content of \(20\ \text{MJ\,kg}^{-1}\) for the biomass). Energy is transferred to the next trophic level (zooplankton) with an efficiency of \(10\%\), and from zooplankton to fish with the same efficiency. Fish require \(2\%\) of their body mass per day as food, and the energy content of fish tissue is also \(20\ \text{MJ\,kg}^{-1}\). Estimate the maximum sustainable fish biomass (in kilograms) that the lake can support.

Answer Options

Correct Answer A. Approximately \(3.8\times10^{3}\) kg of fish.
B. Approximately \(5.6\times10^{2}\) kg of fish.
C. Approximately \(1.2\times10^{4}\) kg of fish.
D. Approximately \(9.3\times10^{3}\) kg of fish.
Correct Answer
A
Correct Option:
Approximately \(3.8\times10^{3}\) kg of fish.

About This Question

This is Gce Model Questions Vol1 2023 Biology Question 23. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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