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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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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 practice is appropriate laboratory safety?

Please select an answer first.

Correct answer: A

The correct answer is Wear suitable eye protection and follow the teacher's instructions..

  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: Eye protection, proper instructions, careful labeling, and correct procedures reduce laboratory risk.
  3. Check the answer: The correct answer is Wear suitable eye protection and follow the teacher's instructions..

Eye protection, proper instructions, careful labeling, and correct procedures reduce laboratory risk.

2. QuestionMultiple choice

Why should a safety data sheet be consulted for a chemical?

Please select an answer first.

Correct answer: B

The correct answer is It provides information about hazards, handling, storage, and emergency response..

  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: Safety data sheets describe chemical hazards and recommended precautions for safe use and disposal.
  3. Check the answer: The correct answer is It provides information about hazards, handling, storage, and emergency response..

Safety data sheets describe chemical hazards and recommended precautions for safe use and disposal.

3. QuestionMultiple choice

How should chemical waste be handled?

Please select an answer first.

Correct answer: C

The correct answer is Follow the laboratory's labeled disposal procedure and never pour materials away without permission..

  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: Proper disposal prevents injury, harmful reactions, and environmental contamination.
  3. Check the answer: The correct answer is Follow the laboratory's labeled disposal procedure and never pour materials away without permission..

Proper disposal prevents injury, harmful reactions, and environmental contamination.

4. QuestionMultiple choice

What is an ethical treatment of organisms in an investigation?

Please select an answer first.

Correct answer: D

The correct answer is Use the fewest organisms needed, minimize harm, and follow approved care procedures..

  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: Ethical research protects organisms, uses justified methods, and follows institutional and legal requirements.
  3. Check the answer: The correct answer is Use the fewest organisms needed, minimize harm, and follow approved care procedures..

Ethical research protects organisms, uses justified methods, and follows institutional and legal requirements.

5. QuestionMultiple choice

What is a scientific model?

Please select an answer first.

Correct answer: A

The correct answer is A representation used to describe, explain, or predict a system or process..

  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: Models simplify complex systems and can be physical, visual, mathematical, or computer-based.
  3. Check the answer: The correct answer is A representation used to describe, explain, or predict a system or process..

Models simplify complex systems and can be physical, visual, mathematical, or computer-based.

6. QuestionMultiple choice

Why should a model's limitations be stated?

Please select an answer first.

Correct answer: B

The correct answer is A model may simplify or omit features, so its predictions may not apply in every situation..

  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: Recognizing limitations helps users interpret predictions appropriately and identify when more evidence is needed.
  3. Check the answer: The correct answer is A model may simplify or omit features, so its predictions may not apply in every situation..

Recognizing limitations helps users interpret predictions appropriately and identify when more evidence is needed.

7. QuestionMultiple choice

What does reproducibility mean?

Please select an answer first.

Correct answer: C

The correct answer is Other researchers can repeat a study using the described method and obtain consistent findings..

  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: Reproducibility strengthens confidence that a finding is not limited to one researcher, sample, or accidental result.
  3. Check the answer: The correct answer is Other researchers can repeat a study using the described method and obtain consistent findings..

Reproducibility strengthens confidence that a finding is not limited to one researcher, sample, or accidental result.

8. QuestionMultiple choice

Why should scientists communicate uncertainty?

Please select an answer first.

Correct answer: D

The correct answer is It shows the limits of measurements and prevents evidence from being overstated..

  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: Measurement error, sample variation, and model limits should be communicated so readers can judge the strength of a claim.
  3. Check the answer: The correct answer is It shows the limits of measurements and prevents evidence from being overstated..

Measurement error, sample variation, and model limits should be communicated so readers can judge the strength of a claim.

9. QuestionMultiple choice

Why should sources be cited in a scientific report?

Please select an answer first.

Correct answer: A

The correct answer is Readers can identify the evidence and evaluate or locate the original work..

  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: Citations give credit and allow readers to verify the information used to support a conclusion.
  3. Check the answer: The correct answer is Readers can identify the evidence and evaluate or locate the original work..

Citations give credit and allow readers to verify the information used to support a conclusion.

10. QuestionMultiple choice

What is the best response when new evidence conflicts with a hypothesis?

Please select an answer first.

Correct answer: B

The correct answer is Evaluate the methods and evidence, revise the hypothesis if needed, and conduct further testing..

  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: Science uses evidence to refine explanations; a hypothesis is not protected from revision when results disagree.
  3. Check the answer: The correct answer is Evaluate the methods and evidence, revise the hypothesis if needed, and conduct further testing..

Science uses evidence to refine explanations; a hypothesis is not protected from revision when results disagree.

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