Experiment: Mature red blood cells and white blood cells were placed in a hypotonic solution, and their structural integrity was observed over time.Observation: Red blood cells swelled and burst quickly, while white blood cells remained intact for a longer time.Question: What explains the observed difference?
Correct answer: D. Red blood cells lack nuclei and organelles for osmotic regulation.
- A. White blood cells burst faster due to active immunity.
- B. White blood cells have a weaker membrane.
- C. Red blood cells are more resistant to osmotic pressure.
- D. Red blood cells lack nuclei and organelles for osmotic regulation.
Explanation
The correct answer is that red blood cells lack nuclei and organelles for osmotic regulation. In a hypotonic solution, water moves into the cell causing it to swell and potentially burst. Red blood cells, lacking nuclei and organelles, cannot regulate this influx of water, leading to their quick swelling and bursting. White blood cells, on the other hand, have structures that help maintain their structural integrity in such conditions. The other options are incorrect as they do not align with the observed outcomes 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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