Standard Science Primary 3 Diversity

A fish was kept in a bowl of water that had been boiled and then cooled down. After some time, the fish died. What was the most likely cause of its death?

A The water had no dissolved air.
B The water was too clean.
C The water had no food.
D The water was too cold.
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Worked Solution

Step 1: Boiling water removes dissolved gases, including oxygen. Step 2: Cooling it back down does not automatically put the air back in quickly. Step 3: Fish need dissolved air to breathe through their gills. Step 4: Final Answer: The water had no dissolved air.

Correct answer: The water had no dissolved air.

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