Experiment: An earthworm was cut into two segments. Only one half regenerated into a complete worm.Observation: The anterior half (head side) showed regeneration.Question: What biological process does this demonstrate?
Correct answer: D. Regeneration is polarity-dependent in organisms.
- A. All worm segments regenerate equally.
- B. Posterior parts have more stem cells.
- C. Earthworms cannot regenerate.
- D. Regeneration is polarity-dependent in organisms.
Explanation
In this experiment, the observation that only the anterior half of the earthworm regenerated demonstrates the concept of polarity-dependent regeneration in organisms. This means that certain parts of an organism have the ability to regenerate while others may not. The other options are incorrect because they do not align with the specific observation provided 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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