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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

What is the best way to test the effect of fertilizer type on plant height?

Please select an answer first.

Correct answer: A

The correct answer is Change fertilizer type while keeping plant species, light, water, and time constant..

  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: Changing one planned factor while controlling others helps isolate the effect of fertilizer type.
  3. Check the answer: The correct answer is Change fertilizer type while keeping plant species, light, water, and time constant..

Changing one planned factor while controlling others helps isolate the effect of fertilizer type.

2. QuestionMultiple choice

Why is random sampling useful when studying a population?

Please select an answer first.

Correct answer: B

The correct answer is It can reduce selection bias and give members a fairer chance of being included..

  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: Random sampling helps produce a sample that is less likely to overrepresent a convenient subgroup.
  3. Check the answer: The correct answer is It can reduce selection bias and give members a fairer chance of being included..

Random sampling helps produce a sample that is less likely to overrepresent a convenient subgroup.

3. QuestionMultiple choice

What is sampling bias?

Please select an answer first.

Correct answer: C

The correct answer is A systematic tendency for a sample to differ from the population it is meant to represent..

  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: Sampling bias can occur when the method favors certain individuals or conditions and produces an unrepresentative sample.
  3. Check the answer: The correct answer is A systematic tendency for a sample to differ from the population it is meant to represent..

Sampling bias can occur when the method favors certain individuals or conditions and produces an unrepresentative sample.

4. QuestionMultiple choice

What is a controlled experiment?

Please select an answer first.

Correct answer: D

The correct answer is An investigation in which the researcher manipulates a variable and compares results under controlled conditions..

  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: Controlled experiments use planned treatments, comparison groups, and constants to test cause-and-effect relationships.
  3. Check the answer: The correct answer is An investigation in which the researcher manipulates a variable and compares results under controlled conditions..

Controlled experiments use planned treatments, comparison groups, and constants to test cause-and-effect relationships.

5. QuestionMultiple choice

What is an observational study?

Please select an answer first.

Correct answer: A

The correct answer is A study in which researchers record conditions or behavior without assigning a 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: Observational studies can reveal patterns in natural settings but may not establish causation as strongly as controlled experiments.
  3. Check the answer: The correct answer is A study in which researchers record conditions or behavior without assigning a treatment..

Observational studies can reveal patterns in natural settings but may not establish causation as strongly as controlled experiments.

6. QuestionMultiple choice

What does reliability describe?

Please select an answer first.

Correct answer: B

The correct answer is How consistently a method produces similar results when repeated..

  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 reliable method gives consistent results across trials or observers; reliability is different from accuracy.
  3. Check the answer: The correct answer is How consistently a method produces similar results when repeated..

A reliable method gives consistent results across trials or observers; reliability is different from accuracy.

7. QuestionMultiple choice

What does validity describe in an investigation?

Please select an answer first.

Correct answer: C

The correct answer is Whether the method actually measures or tests what it is intended to measure or test..

  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 valid investigation addresses the intended question and supports appropriate conclusions from its design and data.
  3. Check the answer: The correct answer is Whether the method actually measures or tests what it is intended to measure or test..

A valid investigation addresses the intended question and supports appropriate conclusions from its design and data.

8. QuestionMultiple choice

What is accuracy?

Please select an answer first.

Correct answer: D

The correct answer is How close a measurement is to the accepted or true value..

  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: Accuracy concerns closeness to the true value, while precision concerns consistency among repeated measurements.
  3. Check the answer: The correct answer is How close a measurement is to the accepted or true value..

Accuracy concerns closeness to the true value, while precision concerns consistency among repeated measurements.

9. QuestionMultiple choice

What is precision?

Please select an answer first.

Correct answer: A

The correct answer is How close repeated measurements are to one another..

  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 set of measurements can be precise but inaccurate if they cluster away from the true value.
  3. Check the answer: The correct answer is How close repeated measurements are to one another..

A set of measurements can be precise but inaccurate if they cluster away from the true value.

10. QuestionMultiple choice

Why should an investigation include a clear procedure?

Please select an answer first.

Correct answer: B

The correct answer is Another investigator should be able to repeat the method and evaluate the results..

  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: Detailed procedures support reproducibility and make it easier to identify sources of error or differences between studies.
  3. Check the answer: The correct answer is Another investigator should be able to repeat the method and evaluate the results..

Detailed procedures support reproducibility and make it easier to identify sources of error or differences between studies.

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