HOTS Science Primary 6 Interactions

A chemical was introduced into a pond, killing all the floating water plants. Which organism in the food web below would be affected LAST?

A Large fish
B Small fish
C Heron
D Mosquito larvae
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Worked Solution

Step 1: Plants are producers (base of the web). Step [2-9]: Energy flow goes from plants → larvae → small fish → large fish → Heron. Step [2-9]: The top predator (Heron) is furthest from the impact and will be affected last as the food shortage travels up the chain.

Correct answer: Heron

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