Standard Science Primary 3 Diversity

A fish was placed in a small bowl of water that had been boiled and then cooled down. After a few hours, the fish died. Why?

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

Step 1: Boiling water removes the dissolved air (oxygen) from it. Step 2: Even when cooled, the oxygen level remains very low unless aerated. Step 3: Fish need dissolved air to breathe through their gills; without it, they suffocate.

Correct answer: The water had no dissolved air.

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