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Class 9 · Science
→A student records only the data that support the hypothesis. What flawed practice does this illustrate?
Class 9 · Science
→Why is random sampling useful in an experiment?
Class 9 · Science
→Several students perform the same experiment using the same method and obtain similar results. Which quality is strengthened?
Class 9 · Science
→Which observation would make it inappropriate to conclude that fertilizer alone caused the growth?
Class 9 · Science
→A student claims that plants grow faster in red light than in blue light. What would be the null hypothesis?
Class 9 · Science
→Which change would most improve the validity of an experiment?
Class 9 · Science
→A thermometer reads two degrees above the true temperature every time. What type of error is this?
Class 9 · Science
→If repeated measurements in an experiment vary greatly what is the most likely problem?
Class 9 · Science
→A hypothesis states that more exercise increases pulse rate. Which experimental plan is the fairest?
Class 9 · Science
→What is the main problem if seeds of different species are used while testing the effect of salt on germination?
Class 9 · Science
→A student wants to test the effect of temperature on magnet strength. Which result is the most suitable measurement?
Class 9 · Science
→In which situation is a control group most necessary?
Class 9 · Science
→An experiment gives results opposite to the hypothesis. What is the most scientific next step?
Class 9 · Science
→A student applies a new fertilizer to five plants and leaves only one untreated. What is the best way to improve reliability?
Class 9 · Science
→Which statement presents the clearest testable hypothesis?
Class 9 · Science
→If the hypothesis that sugar dissolves faster in warm water is tested what should be properly controlled?
Class 9 · Science
→In an experiment the amount of fertilizer is changed and plant height is measured. Which is the dependent variable?
Class 9 · Science
→A student predicts that greater light exposure will increase plant growth. What is the independent variable in this test?
Class 9 · Science
→A hypothesis was supported in an experiment but the sample size was very small. What is the most appropriate next step?
Class 9 · Science
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