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Why is it suitable to take all measurements at the same time in an experiment on soil depth and temperature?

Answer and explanation

Correct answer: Because time of day may affect temperature

Measurements should be taken at the same time when time itself can influence the result. Soil temperature changes during the day because surroundings may become warmer or cooler. If one depth is measured in the morning and another in the afternoon, the difference could be caused by the time of day rather than by soil depth. Taking readings together makes the comparison fairer and reduces the effect of this unwanted factor.

Option D is correct because the time of day may affect temperature. Keeping measurement time consistent helps control that possible influence. It does not ensure that depth never changes, make soil type independent, or remove the need for a thermometer. The thermometer is still needed to measure temperature. Therefore, simultaneous or consistently timed readings improve the reliability of the depth-and-temperature comparison.

Related tags

Time-Of-DayControlled-VariableSoil-TemperatureVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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