Experiment: To test osmoregulation, fish were moved from freshwater to brackish water and monitored for weight change.Observation: Fish initially lost weight but later stabilized.Question: What does this response indicate?
Correct answer: A. Fish adjust their internal salt concentration over time.
- A. Fish adjust their internal salt concentration over time.
- B. Fish cannot survive salt changes.
- C. Osmosis is not involved in weight loss.
- D. Weight loss is unrelated to water conditions.
Explanation
The correct answer is that fish adjust their internal salt concentration over time. When fish were moved from freshwater to brackish water, they initially lost weight, indicating they were adjusting their internal salt concentration to regulate osmosis. This weight loss was related to the change in water conditions and not due to an inability to survive salt changes or an unrelated process like osmosis. Therefore, option A is correct while the other options are incorrect based on the observations made in the experiment.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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