Long answer·Hard exam skill (4/5)·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
A school wants to reduce the environmental impact of daily lunch waste. Students generate food scraps, paper, plastic wrappers and a few used pen refills.
Total: 8 marks
(a) Propose a segregation plan using at least three categories. (3 marks)
(b) State one treatment or disposal method for each category. (3 marks)
(c) Explain why reducing waste at source is better than only disposing of it later. (2 marks)
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