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Subjects

Science

Scientific questions and observations

Scientific questions and observations introduces Class 9 students to the habits of mind that begin scientific inquiry in the chapter “Exploration: Entering the World of Secondary Science.” Students learn how to turn curiosity into clear, testable questions, observe objects and events carefully, distinguish observations from explanations, and record evidence using words, measurements, tables, or sketches. The topic also develops awareness of patterns, variables, fair comparisons, and the need to base conclusions on evidence rather than assumptions.

Hard · Level 4 · 25 questions

Practice questions

01What is the main advantage of increasing sample size in a scientific investigation?

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02A student wrote that not all seeds germinated because the seeds were defective. What type of statement is this?

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03Why is calculating only the average insufficient when three measurements differ greatly?

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04Which question establishes a fair comparison?

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05A student recorded that a plant grew quickly. What is the best way to make this measurable?

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06In an experiment the observer knows which plant received fertiliser and unintentionally gives it a higher health score. What problem does this illustrate?

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07Which data record is scientifically the most complete?

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08What is the main purpose of repeating the same experiment on different days?

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09If a scale is not placed from the soil surface while measuring plant height what type of error may occur?

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10Which conclusion is reasonably supported by the available observation?

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11A question asks which material is the best conductor of heat. What must be clarified to make it testable?

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12If different observers describe the same event using different words what is the best way to improve comparison?

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13Which question looks for correlation but does not directly prove causation?

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14A scientist changed the procedure after not obtaining the expected result but did not record the change. Why is this inappropriate?

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15If an instrument has an incorrect zero reading before an experiment what effect may occur on all measurements?

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16In which situation is it most necessary to convert a qualitative observation into a quantitative one?

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17A student selects only plants that are already tall and then tests a fertiliser. What problem does this create?

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18From which observation can a rate of change be calculated?

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19Why is the control group as important as the treatment group in an experiment?

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20Which observation describes only a change rather than its cause?

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21Why may data analysis become difficult when many outcomes are measured in one question?

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22Why is recording only length insufficient for measuring leaf area?

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23If a scientific question cannot be measured using available instruments what is the most appropriate step?

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24Which sequence is most logical in a scientific investigation?

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25A student concluded that more light increases plant growth but the dark group had a smaller initial size. What should be done to improve the conclusion?

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