Syllabus Edition
First teaching 2023
First exams 2025
A simple aquatic mesocosm is shown below
Why is A an important component of the mesocosm?
A provides protection for the primary consumers from predators.
A converts heat energy to chemical energy.
A provides carbohydrates and oxygen to support the mesocosm.
A helps to maintain a stable temperature.
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Which of the following considerations should be taken into account when building a mesocosm to test the impact of a particular environmental variable?
| A | Any type of container can be used | No secondary consumers | Inclusion of autotrophs | Producers should be slow-growing |
| B | Transparent container | Food chains of up to three organisms can be included | Inclusion of autotrophs | Producers should be slow-growing |
| C | Transparent container | No secondary consumers | Inclusion of autotrophs | A control mesocosm should be built |
| D | Transparent container |
No secondary consumers |
Inclusion of autotrophs |
 Soil should be sterilised to prevent contamination |
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1 markWhich of the following is not true about mesocosms?
Mesocosms allow the control of environmental conditions
Mesocosms allow collection of reliable data
Continuous data can be collected from a mesocosm
It is easy to mimic natural environmental conditions in a mesocosm
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