Standard Science Primary 6 Interactions

Which of the following will cause a decrease in the population of fish in a river?

A An increase in the amount of dissolved oxygen.
B A decrease in the number of water plants.
C A decrease in the number of predators.
D The banning of illegal fishing in the area.
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Worked Solution

Step 1: Water plants provide food and shelter for fish. Step 2: They also produce oxygen through photosynthesis. Step 3: A decrease in water plants reduces resources, causing the fish population to fall.

Correct answer: A decrease in the number of water plants.

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