Standard Science Primary 6 Interactions

Study the food chain: Grass → Grasshopper → Frog → Snake. If the frog population suddenly decreases, what will most likely happen?

A The grass population will not change.
B The grasshopper population will decrease.
C The grasshopper population will increase and the snake population will decrease.
D The snake population will increase.
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Worked Solution

CLAIM: The grasshopper population will increase and the snake population will decrease. EVIDENCE: Frogs eat grasshoppers (fewer frogs = fewer predators for grasshoppers). Snakes eat frogs (fewer frogs = less food for snakes). REASONING: In a food chain, a decrease in one population affects both its prey and its predators. Fewer frogs reduces predation pressure on grasshoppers (population rises) and reduces the food supply for snakes (population falls).

Correct answer: The grasshopper population will increase and the snake population will decrease.

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