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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 5 · 25 questions

Practice questions

01A student investigates whether soil acidity affects seed germination. Which is the most appropriate dependent variable?

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Answer and explanation

02Which scientific question states both the independent and dependent variables most clearly?

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Answer and explanation

03A student measured three times and obtained values of twelve point one centimetres twelve point two centimetres and twelve point one centimetres. What do these values mainly indicate?

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Answer and explanation

04In an experiment plants received different amounts of fertiliser but each plant also received a different amount of water. What is the main weakness of this investigation?

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Answer and explanation

05Which statement gives a conclusion rather than an observation?

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Answer and explanation

06A student asks how surface area affects the rate of evaporation. Which factor is most essential to keep the same for a fair test?

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Answer and explanation

07Which option includes both a qualitative and a quantitative observation?

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Answer and explanation

08A scientist recorded only the data that supported the expected idea. This is an example of which problem?

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Answer and explanation

09Three groups of seeds were kept at different temperatures but each group contained only one seed. What is the best way to increase the reliability of the conclusion?

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Answer and explanation

10A student placed a thermometer in hot water and recorded the value immediately. What should have been done for a more reliable observation?

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Answer and explanation

11Which question requires the greatest revision to become suitable for scientific investigation?

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Answer and explanation

12A plant grew by approximately two centimetres per day. What type of statement is this?

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Answer and explanation

13If all measurements in an experiment are consistently higher than the true value what type of error does this suggest?

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Answer and explanation

14Which observation would be considered the most objective?

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Answer and explanation

15A student investigates the relationship between light intensity and the rate of photosynthesis. What could be a suitable indicator of photosynthesis rate?

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Answer and explanation

16In an experiment three values are close to one another but all are far from the accepted value. What does this situation indicate?

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Answer and explanation

17In which situation would a control group be most necessary?

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Answer and explanation

18A student concluded that more water makes plants grow faster after observing for only two days. What is the main problem?

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Answer and explanation

19Which option correctly turns an observation into a suitable question?

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Answer and explanation

20A student drops a ball from different heights and measures rebound height. Which factor should be controlled?

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Answer and explanation

21Which statement correctly distinguishes evidence from inference?

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Answer and explanation

22A measuring cylinder was placed on a tilted surface during an experiment. What problem would this mainly cause?

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Answer and explanation

23Which method would reduce the effect of human reaction time the most?

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Answer and explanation

24A student recorded only the final height of plants but not their initial height. What difficulty will this create?

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Answer and explanation

25Which statement is an example of incorrectly treating correlation as causation?

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Answer and explanation

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