Standard Science Primary 3 Diversity

A fish was kept in a tank filled with water. The top of the tank was sealed with a layer of oil. Why did the fish die after a few hours?

A It had no air.
B It had no light.
C It had no food.
D It had no space.
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Worked Solution

Step 1: Understand that oil prevents air from dissolving into the water. Step 2: Fish need oxygen (air) from the water to breathe. Step 3: Without fresh air entering the water, the fish suffocated.

Correct answer: It had no air.

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