Experiment: To examine nutrient transport, a dye was introduced into the roots of two identical plants. One was placed in cold conditions; the other at room temperature.Observation: Dye reached leaves faster in the room temperature plant.Question: What conclusion is best supported?
Correct answer: C. Low temperature slows down active transport in plants.
- A. Transport is faster in cold due to viscosity.
- B. Dye movement is unaffected by temperature.
- C. Low temperature slows down active transport in plants.
- D. Cold enhances capillary action.
Explanation
The correct answer is that low temperature slows down active transport in plants, as evidenced by the dye reaching leaves faster in the room temperature plant. Option A is incorrect because viscosity would not lead to faster transport in cold conditions. Option B is incorrect as temperature clearly affected dye movement. Option D is incorrect as capillary action is not the primary mechanism at play in this 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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