Experiment: To test geotropism, potted plants were placed horizontally and left for 3 days. Root and shoot directions were noted.Observation: Roots grew downward while shoots curved upward.Question: What is the most appropriate conclusion?
Correct answer: B. Roots and shoots respond to gravity in opposite directions.
- A. Roots grow randomly regardless of gravity.
- B. Roots and shoots respond to gravity in opposite directions.
- C. Geotropism only affects aquatic plants.
- D. Shoots follow gravity just like roots.
Explanation
In this experiment, the observation that roots grew downward while shoots curved upward indicates that roots and shoots respond to gravity in opposite directions. This phenomenon is known as geotropism, where roots exhibit positive geotropism by growing towards gravity, while shoots exhibit negative geotropism by growing in the opposite direction. The other options are incorrect as they do not align with the observed results of 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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