Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
The figure shows energy available at four trophic levels in a food chain.
Total: 5 marks
(a) Which level has the maximum energy? (1 mark)
(b) What percentage of producer energy reaches primary consumers in the figure? (1 mark)
(c) Name the trophic level that receives 10 J. (1 mark)
(d) Give one reason for decrease in energy at successive levels. (2 marks)
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