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Class 9 · Science
→What is the most important function of a control group in an experiment?
Class 9 · Science
→A student tested seed germination at different temperatures but gave different amounts of water to each group. Why will interpretation be difficult?
Class 9 · Science
→Which hypothesis is the most scientific and testable?
Class 9 · Science
→In an experiment reaction time decreased as temperature increased. Which type of data would be most useful to support the hypothesis?
Class 9 · Science
→A student concluded that more fertiliser makes all plants grow faster after testing only one plant species. What is the main flaw in the conclusion?
Class 9 · Science
→If the hypothesis states that electrical resistance increases with wire length which factor should remain constant in a fair experiment?
Class 9 · Science
→In an experiment light intensity was changed and oxygen bubbles produced by a plant were counted. Which statement is correct?
Class 9 · Science
→A student hypothesises that increasing nitrogen in soil will increase leaf area. How should the dependent variable be measured most appropriately?
Class 9 · Science
→After a detailed experiment the results support the hypothesis under some conditions but contradict it under others. What is the best scientific conclusion?
Class 9 · Science
→Which principle is most important when living organisms are used in an experiment?
Class 9 · Science
→Why is a risk assessment carried out before an experiment?
Class 9 · Science
→A student predicts that a reaction will be slower in cold conditions and records only reaction time. Which additional information would strengthen the conclusion?
Class 9 · Science
→Which statement shows appropriate caution between data and conclusion?
Class 9 · Science
→In an experiment samples are assigned to groups according to the student's preference. What is the main risk?
Class 9 · Science
→If an experiment uses only two widely separated values of the independent variable what limitation arises?
Class 9 · Science
→In which situation is peer review most useful?
Class 9 · Science
→Results supporting a hypothesis were obtained only at one specific temperature. What should be done before making a broad conclusion?
Class 9 · Science
→A student wants to test the claim that darkness improves memory. Which dependent variable is most suitable?
Class 9 · Science
→Which experimental change could improve accuracy without necessarily improving reliability?
Class 9 · Science
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