Experiment: A student compared oxygen bubbles from Elodea (aquatic plant) placed under different light intensities in water.Observation: Bubble rate was highest at moderate light and plateaued at high intensity.Question: What is a valid interpretation?
Correct answer: B. Photosynthesis increases with light intensity but levels off due to limiting factors.
- A. Oxygen production is directly linked to photosynthesis.
- B. Photosynthesis increases with light intensity but levels off due to limiting factors.
- C. Higher photosynthesis is always associated with low light intensity.
- D. Bubbles observed are a result of plant respiration, not photosynthesis.
Explanation
The correct answer is Option B: Photosynthesis increases with light intensity but levels off due to limiting factors. This interpretation aligns with the observation that bubble rate was highest at moderate light and plateaued at high intensity. Option A is incorrect as oxygen production is indeed related to photosynthesis. Option C is incorrect as the experiment showed that moderate light resulted in the highest bubble rate, not low light. Option D is incorrect as the bubbles observed are a product of photosynthesis, not respiration.
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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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