Standard Science Primary 6 Interactions

Study the food web: Algae → Fish → Heron. If the population of herons decreases, what happens to the algae population?

A It decreases because there are more fish eating it.
B It remains the same because fish eat algae.
C It increases because there are more fish.
D It increases because herons no longer eat algae.
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Worked Solution

Step 1: Fewer herons mean fewer predators for the fish. Step [2-9]: The fish population will increase. Step [2-9]: More fish will consume more algae, causing the algae population to drop.

Correct answer: It decreases because there are more fish eating it.

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