IB Biology SL 4.2.4 Food chains and food webs Question Bank
Practise IB Biology SL 4.2.4 by constructing and interpreting food chains and food webs.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Define a food chain and identify trophic feeding relationships.
- Construct a food web from feeding interactions between organisms.
C4.2.4—Food chains and food webs 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.
The sea star also eats the sea snails. Construct a food web to show the feeding relationships between these five organisms in the ecosystem.
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