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 the ozone layer between incoming ultraviolet rays and Earth's surface.
Total: 5 marks
(a) Name the harmful radiation shown from the Sun. (1 mark)
(b) What is the role of the ozone layer with respect to this radiation? (1 mark)
(c) Why are CFC sources shown as a concern in the figure? (2 marks)
(d) State one possible effect of increased UV exposure on humans. (1 mark)
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