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A student compared two plants but measured one in the morning and the other in the evening. What is the problem?

Answer and explanation

Correct answer: Measurement time may become an additional influencing factor

A fair comparison requires important conditions to be kept the same, or any differences to be recorded and controlled. Time of measurement can matter because a plant’s water content, posture, temperature, light exposure, or other properties may change during the day. If one plant is measured in the morning and the other in the evening, a difference in the readings may be caused by time rather than by a real difference between the plants. Time has then become an additional influencing, or confounding, factor.

The best procedure is to measure both plants at the same time of day, using the same instrument and method, and to repeat measurements when suitable. This makes the comparison more reliable. Therefore, option A is correct. The statement that plants never change is false, and neither morning nor evening is automatically more scientific. Consistent observation conditions are essential for a fair test.

Related tags

Measurement TimeFair ComparisonPlant ObservationScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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