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Biology Practice Tests

These Grade 9 Biology practice tests introduce the study of life through questions about life processes, cells, organelles, biomolecules, enzymes, photosynthesis, cellular respiration, homeostasis, adaptation, and scientific investigation.

Skills covered

  • Recognizing characteristics of life, levels of organization, homeostasis, metabolism, reproduction, and adaptation
  • Identifying cell structures and explaining the functions of the nucleus, membrane, mitochondria, chloroplasts, ribosomes, and other organelles
  • Understanding carbohydrates, proteins, lipids, nucleic acids, enzymes, water, pH, and biological reactions
  • Connecting photosynthesis, cellular respiration, ATP, fermentation, matter, and energy in living systems
  • Analyzing hypotheses, variables, controls, repeated trials, models, graphs, conclusions, and scientific communication

How to use these practice tests

Identify the level of organization or process, connect structures to functions, track matter and energy, and use evidence from experiments or graphs. Review each explanation to strengthen biology vocabulary and scientific reasoning.

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

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Grade 9 Biology Practice Tests

Practice Grade 9 Science questions about characteristics of life, cells, organelles, biomolecules, enzymes, photosynthesis, cellular respiration, homeostasis, and scientific investigation.

Choose the best answer. Identify the biological system or process, apply the relevant principle, and use evidence when interpreting an experiment or model.

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

What is a scientific hypothesis?

Please select an answer first.

Correct answer: A

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

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: A hypothesis can be tested through observations or experiments.
  3. Check the answer: The correct answer is A testable explanation or prediction based on observations..

A hypothesis can be tested through observations or experiments.

2. QuestionMultiple choice

What is the independent variable in an experiment?

Please select an answer first.

Correct answer: B

The correct answer is The factor that the investigator deliberately changes..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: The independent variable is manipulated to test its effect.
  3. Check the answer: The correct answer is The factor that the investigator deliberately changes..

The independent variable is manipulated to test its effect.

3. QuestionMultiple choice

What is the dependent variable?

Please select an answer first.

Correct answer: C

The correct answer is The factor that is measured as the outcome..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: The dependent variable changes in response to the independent variable and is measured.
  3. Check the answer: The correct answer is The factor that is measured as the outcome..

The dependent variable changes in response to the independent variable and is measured.

4. QuestionMultiple choice

Why is a control group useful?

Please select an answer first.

Correct answer: D

The correct answer is It provides a comparison for evaluating the effect of the independent variable..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: A control group helps identify whether the tested factor caused a difference.
  3. Check the answer: The correct answer is It provides a comparison for evaluating the effect of the independent variable..

A control group helps identify whether the tested factor caused a difference.

5. QuestionMultiple choice

Why should scientists conduct repeated trials?

Please select an answer first.

Correct answer: A

The correct answer is Repeated trials can increase reliability and reveal unusual results..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: More trials provide a stronger basis for identifying patterns and reducing the influence of random variation.
  3. Check the answer: The correct answer is Repeated trials can increase reliability and reveal unusual results..

More trials provide a stronger basis for identifying patterns and reducing the influence of random variation.

6. QuestionMultiple choice

What does a scientific model represent?

Please select an answer first.

Correct answer: B

The correct answer is A system, structure, or process used to explain or predict observations..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: Models simplify or represent systems so scientists can study relationships and make predictions.
  3. Check the answer: The correct answer is A system, structure, or process used to explain or predict observations..

Models simplify or represent systems so scientists can study relationships and make predictions.

7. QuestionMultiple choice

What is a variable kept constant in an experiment?

Please select an answer first.

Correct answer: C

The correct answer is A condition that is held the same for all groups or trials..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: Constants allow the investigator to focus on the effect of the independent variable.
  3. Check the answer: The correct answer is A condition that is held the same for all groups or trials..

Constants allow the investigator to focus on the effect of the independent variable.

8. QuestionMultiple choice

What should a conclusion do after data are collected?

Please select an answer first.

Correct answer: D

The correct answer is State whether the evidence supports the hypothesis and explain the pattern in the data..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: A conclusion interprets the data and relates the evidence to the original hypothesis.
  3. Check the answer: The correct answer is State whether the evidence supports the hypothesis and explain the pattern in the data..

A conclusion interprets the data and relates the evidence to the original hypothesis.

9. QuestionMultiple choice

A graph shows plant height increasing as light intensity increases, then leveling off. What does the graph suggest?

Please select an answer first.

Correct answer: A

The correct answer is Light intensity supports growth up to a point, after which another factor may limit growth..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: The plateau suggests that light is no longer the limiting factor after a certain intensity.
  3. Check the answer: The correct answer is Light intensity supports growth up to a point, after which another factor may limit growth..

The plateau suggests that light is no longer the limiting factor after a certain intensity.

10. QuestionMultiple choice

Which practice improves scientific communication?

Please select an answer first.

Correct answer: B

The correct answer is Include labeled data tables, clear units, methods, and evidence-based explanations..

  1. Identify the biology concept: Determine whether the question asks about life processes, cells, matter, energy, regulation, or scientific reasoning.
  2. Apply the biological principle: Clear methods, units, labels, and complete data help others understand and evaluate the work.
  3. Check the answer: The correct answer is Include labeled data tables, clear units, methods, and evidence-based explanations..

Clear methods, units, labels, and complete data help others understand and evaluate the work.

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