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Why should seeds of similar size be selected in an experiment?

Answer and explanation

Correct answer: To reduce initial differences

Direct answer: D, seeds of similar size reduce initial differences. In a fair experiment, the tested factor should be the main reason for any later difference. Seed size can influence stored food, germination, and early growth. Step by step: select seeds that are alike, place them under the same conditions, change only the intended variable, observe growth, and compare results. D is correct because similar starting seeds make the comparison fairer. A is wrong because seed selection does not change the hypothesis. B is wrong because it does not improve colour. C is wrong because seed size is not the independent variable being removed; it is a starting condition to control. Memory cue: similar beginnings make a fair test.

Related tags

Fair ComparisonSeed SizeControlled ConditionHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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