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Scientific Investigation Practice Tests

These Grade 9 Biology practice tests build the skills needed to ask testable questions, design investigations, collect data, analyze graphs, evaluate evidence, and communicate conclusions. Topics include hypotheses, variables, controls, sampling, reliability, validity, models, and laboratory safety.

Skills covered

  • Identifying testable questions, hypotheses, independent and dependent variables, constants, controls, and operational definitions
  • Evaluating repeated trials, sample size, random sampling, controlled experiments, observational studies, reliability, validity, accuracy, and precision
  • Calculating and interpreting means and medians and recognizing outliers and trends
  • Selecting and interpreting line graphs, bar graphs, scatter plots, axes, error bars, and claim-evidence-reasoning explanations
  • Applying laboratory safety, ethical treatment, modeling, peer review, reproducibility, citations, and uncertainty communication

How to use these practice tests

Begin by identifying the question, variables, and comparison. Then decide what the data show, how strong the evidence is, and whether the conclusion stays within the investigation limits. Review each explanation to strengthen scientific reasoning and laboratory practice.

For more Grade 9 Science practice, return to the Grade 9 Science category.

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5 Tests
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1. Test

Grade 9 Scientific Investigation Practice Tests

Practice Grade 9 Science questions about scientific questions, hypotheses, variables, controls, experimental design, data analysis, graphs, evidence, and laboratory safety.

Choose the best answer. Identify the variable or evidence type, evaluate the investigation design, and make conclusions that match the data and its limitations.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

Which question is most suitable for a scientific investigation?

Please select an answer first.

Correct answer: A

The correct answer is How does the amount of light affect the growth of bean plants?.

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: A scientific question is specific, measurable, and testable through observations or an experiment.
  3. Check the answer: The correct answer is How does the amount of light affect the growth of bean plants?.

A scientific question is specific, measurable, and testable through observations or an experiment.

2. QuestionMultiple choice

What is a hypothesis?

Please select an answer first.

Correct answer: B

The correct answer is A testable explanation or prediction based on observations..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: A hypothesis proposes a possible explanation that can be tested by collecting evidence.
  3. Check the answer: The correct answer is A testable explanation or prediction based on observations..

A hypothesis proposes a possible explanation that can be tested by collecting evidence.

3. QuestionMultiple choice

What is the independent variable in an experiment?

Please select an answer first.

Correct answer: C

The correct answer is The factor deliberately changed by the investigator..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: The independent variable is manipulated so its effect on the dependent variable can be measured.
  3. Check the answer: The correct answer is The factor deliberately changed by the investigator..

The independent variable is manipulated so its effect on the dependent variable can be measured.

4. QuestionMultiple choice

What is the dependent variable?

Please select an answer first.

Correct answer: D

The correct answer is The factor measured as the outcome of an investigation..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: The dependent variable responds to the independent variable and is recorded as data.
  3. Check the answer: The correct answer is The factor measured as the outcome of an investigation..

The dependent variable responds to the independent variable and is recorded as data.

5. QuestionMultiple choice

Why should constants be kept the same in an experiment?

Please select an answer first.

Correct answer: A

The correct answer is To make the independent variable the main planned difference between groups..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: Constants reduce alternative explanations and make it easier to attribute differences to the independent variable.
  3. Check the answer: The correct answer is To make the independent variable the main planned difference between groups..

Constants reduce alternative explanations and make it easier to attribute differences to the independent variable.

6. QuestionMultiple choice

What is the purpose of a control group?

Please select an answer first.

Correct answer: B

The correct answer is To provide a comparison that does not receive the experimental treatment..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: A control group helps show what happens without the independent variable or treatment being tested.
  3. Check the answer: The correct answer is To provide a comparison that does not receive the experimental treatment..

A control group helps show what happens without the independent variable or treatment being tested.

7. QuestionMultiple choice

What is an operational definition?

Please select an answer first.

Correct answer: C

The correct answer is A precise description of how a variable will be measured or identified..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: Operational definitions make procedures repeatable by stating exactly how concepts such as growth or activity will be measured.
  3. Check the answer: The correct answer is A precise description of how a variable will be measured or identified..

Operational definitions make procedures repeatable by stating exactly how concepts such as growth or activity will be measured.

8. QuestionMultiple choice

Why are repeated trials useful?

Please select an answer first.

Correct answer: D

The correct answer is They improve reliability and help reveal unusual results or random variation..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: Repeated trials provide more evidence and reduce the influence of an unusual single measurement.
  3. Check the answer: The correct answer is They improve reliability and help reveal unusual results or random variation..

Repeated trials provide more evidence and reduce the influence of an unusual single measurement.

9. QuestionMultiple choice

Why can a larger sample size improve an investigation?

Please select an answer first.

Correct answer: A

The correct answer is It can make results more representative and reduce the influence of individual variation..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: Larger samples can better represent a population, although sampling design and measurement quality still matter.
  3. Check the answer: The correct answer is It can make results more representative and reduce the influence of individual variation..

Larger samples can better represent a population, although sampling design and measurement quality still matter.

10. QuestionMultiple choice

What should a conclusion do?

Please select an answer first.

Correct answer: B

The correct answer is Use the data to state whether the evidence supports the hypothesis and explain the pattern..

  1. Identify the investigation skill: Determine whether the question concerns a question, hypothesis, variable, design, data, evidence, or safety.
  2. Apply the scientific reasoning principle: A conclusion connects evidence to the hypothesis and acknowledges patterns, limitations, or unexpected results.
  3. Check the answer: The correct answer is Use the data to state whether the evidence supports the hypothesis and explain the pattern..

A conclusion connects evidence to the hypothesis and acknowledges patterns, limitations, or unexpected results.

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