Advanced Science Primary 6 Interactions

A pond ecosystem is polluted with a chemical that kills only the floating plants. How does this affect the fish in the pond?

A They will have less dissolved oxygen.
B They will have more food.
C The water temperature will decrease.
D There will be more sunlight for the fish.
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Worked Solution

Step 1: Identify the role of plants. Step 2: Plants produce oxygen during photosynthesis. Step 3: If plants die, the level of dissolved oxygen in the water decreases, affecting fish respiration.

Correct answer: They will have less dissolved oxygen.

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