IB Biology HL D4.2.4 Mesocosm Model Questions

Use controlled mesocosms to model ecosystem stability, then explain how closed bottle systems restrict matter exchange while allowing light energy input.

Exam points

Discuss mesocosm advantages and limitations, including experimental control and replication versus the difficulty of reproducing complete natural ecosystems.
Interpret which of carbon content, temperature and biomass can vary in a closed terrestrial mesocosm.

[Maximum number: 2]

An investigation into food web interactions was conducted in mesocosms in the Mediterranean Sea, off the coast of France. The effects of the addition of soil and fish on bacterial populations were tested.

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Suggest advantages of undertaking this experiment in the sea rather than in the laboratory.

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IB Biology HL D4.2.4 Mesocosm Model Questions question 1