O Levels Biology (5090)•5090/12/M/J/21

Explanation
Identifying Famine-Contributing Factors
Steps:
- Recall common famine causes: drought, conflict, poor governance, economic issues; exclude unrelated like floods or soil fertility alone.
- Evaluate each factor against definitions: famine stems from food shortages due to environmental, political, or economic disruptions.
- Match sequence to choice: yes for drought (1), no for floods (2), yes for war (3), yes for sanctions (4), no for high soil fertility (5).
- Select option aligning with 3 yeses in positions 1,3,4.
Why B is correct:
- B (yes, no, yes, yes, no) matches standard famine factors: environmental stress (drought), conflict (war), and economic barriers (sanctions) per UN famine definitions.
Why the others are wrong:
- A omits economic sanctions, a key contributor.
- C misses drought and war, primary triggers.
- D includes floods, which rarely cause famine alone.
Final answer: B
Topic: Effects of humans on ecosystems
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