IB Biology SL 4.1.16 Predation and population data Question Bank
Practise IB Biology SL 4.1.16 by explaining how predation changes population density and community patterns.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Interpret predator-prey data to describe changes in population density.
- Explain how competition and predation affect species distributions.
C4.1.16—Predator-prey relationships question 1
The sea snail Nucella ostrina and the sea star Pisaster ochraceus are predators of the mussel Mytilus trossulus. The mussels live on rocks at the edge of the sea and feed on phytoplankton and zooplankton. The zooplankton feed on the phytoplankton.
Nucella ostrina
Pisaster ochraceus
Mytilus trossulus
Groups of 50 mussels were transplanted to an experimental area and protected from predation until the start of the experiment. Researchers then investigated the effect of the predators on the population of the mussels over a period of 60 days.
Compare and contrast the effects of the predators on the population of the mussels.
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