Standard Science Primary 3 Diversity

Ravi placed some fish in a tank and completely covered the top with an airtight plastic wrap. What will happen after some time?

A The fish will reproduce.
B The fish will stay healthy because water contains food.
C The fish will die because they have no air.
D The fish will grow faster.
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Worked Solution

Step 1: Airtight wrap prevents new air from entering the tank. Step 2: Living things like fish need air to breathe. Step 3: Once the dissolved oxygen is used up, the fish will die.

Correct answer: The fish will die because they have no air.

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