Advanced Science Primary 6 Interactions

Based on the food web below, what would happen to the population of Organism Z if all Organism Y were killed by a disease?

A The population of Z will only increase.
B The population of Z will only decrease.
C The population of Z will decrease then increase.
D The population of Z will stay the same.
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Worked Solution

Step 1: Identify Organism Z's food source. If Y is the only source, Z will starve. Step [2-9]: Even if Z has other sources, the loss of Y increases competition for other prey. Step [2-9]: Therefore, Z's population will decrease.

Correct answer: The population of Z will only decrease.

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