Experiment: Different concentrations of salt solution were added to onion cells under a microscope. Their vacuoles and membranes were observed.Observation: Higher salt concentrations caused vacuole shrinkage and membrane pulling away from the wall.Question: What is the correct interpretation?
Correct answer: A. Plasmolysis occurs due to water loss in hypertonic solutions.
- A. Plasmolysis occurs due to water loss in hypertonic solutions.
- B. Water floods into onion cells in salt solution.
- C. Salt thickens the cell wall.
- D. Salt enters the vacuole and bursts the cell.
Explanation
In this experiment, the higher salt concentrations led to vacuole shrinkage and membranes pulling away from the cell wall, indicating plasmolysis where water leaves the cell in a hypertonic solution, causing it to shrink. The correct interpretation is that plasmolysis occurs due to water loss in hypertonic solutions. The other options are incorrect because they do not align with the observed results of the experiment.
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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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