If less light falls on a pond surface:
Correct answer: B. The size of fish population becomes smaller
- A. The size of fishes becomes large
- B. The size of fish population becomes smaller
- C. The size of fish population is in no way connected with the amount of light falling on a pond
- D. Mutation will take place in fishes
Explanation
Reduced light lowers photosynthesis by aquatic plants and algae, reducing the food and oxygen base available to fish. The resulting carrying capacity can therefore support a smaller fish population.
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