IB Biology HL 4.2.1 Ecosystem energy and nutrient flows Question Bank
Practise IB Biology HL 4.2.1 by analysing energy exchange and nutrient cycling in open and closed ecosystems.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Compare energy transfer with inorganic-nutrient cycling in ecosystems.
- Evaluate mesocosm evidence for exchanges of matter and energy with surroundings.
C4.2.1—Ecosystems as open systems question 1
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.
Each of the mesocosms is an open ecosystem. State the property that makes the mesocosms open ecosystems.
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