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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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5 Tests
1. Test2. Test3. Test4. Test5. Test

1. Test

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

Which characteristic is shared by all living organisms?

Please select an answer first.

Correct answer: A

The correct answer is They use energy and maintain internal organization..

  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: All living organisms require energy and maintain organized internal conditions, while the other choices do not apply to every organism.
  3. Check the answer: The correct answer is They use energy and maintain internal organization..

All living organisms require energy and maintain organized internal conditions, while the other choices do not apply to every organism.

2. QuestionMultiple choice

What is homeostasis?

Please select an answer first.

Correct answer: B

The correct answer is Maintenance of relatively stable internal conditions..

  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: Homeostasis keeps internal conditions within suitable ranges despite external changes.
  3. Check the answer: The correct answer is Maintenance of relatively stable internal conditions..

Homeostasis keeps internal conditions within suitable ranges despite external changes.

3. QuestionMultiple choice

Which level of organization is made of similar cells working together?

Please select an answer first.

Correct answer: C

The correct answer is Tissue..

  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 tissue is a group of similar cells that performs a related function.
  3. Check the answer: The correct answer is Tissue..

A tissue is a group of similar cells that performs a related function.

4. QuestionMultiple choice

Which process allows an organism to produce offspring?

Please select an answer first.

Correct answer: D

The correct answer is Reproduction..

  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: Reproduction produces new organisms and allows a species to continue.
  3. Check the answer: The correct answer is Reproduction..

Reproduction produces new organisms and allows a species to continue.

5. QuestionMultiple choice

Why are cells considered the basic units of life?

Please select an answer first.

Correct answer: A

The correct answer is All organisms are made of one or more cells that carry out life processes..

  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: Cells are the smallest structures that perform the functions required for life.
  3. Check the answer: The correct answer is All organisms are made of one or more cells that carry out life processes..

Cells are the smallest structures that perform the functions required for life.

6. QuestionMultiple choice

Which observation is evidence that an organism responds to stimuli?

Please select an answer first.

Correct answer: B

The correct answer is A plant bends toward a light source..

  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: Bending toward light is a response to an environmental stimulus.
  3. Check the answer: The correct answer is A plant bends toward a light source..

Bending toward light is a response to an environmental stimulus.

7. QuestionMultiple choice

What is metabolism?

Please select an answer first.

Correct answer: C

The correct answer is The set of chemical reactions that occur in an organism..

  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: Metabolism includes the chemical reactions that obtain, transform, and use matter and energy.
  3. Check the answer: The correct answer is The set of chemical reactions that occur in an organism..

Metabolism includes the chemical reactions that obtain, transform, and use matter and energy.

8. QuestionMultiple choice

Which statement best describes adaptation?

Please select an answer first.

Correct answer: D

The correct answer is An inherited trait that improves survival or reproduction in a particular environment..

  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: Adaptations are inherited features that can increase fitness in a specific environment.
  3. Check the answer: The correct answer is An inherited trait that improves survival or reproduction in a particular environment..

Adaptations are inherited features that can increase fitness in a specific environment.

9. QuestionMultiple choice

Why do organisms need energy?

Please select an answer first.

Correct answer: A

The correct answer is Energy powers processes such as growth, repair, movement, and transport..

  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: Life processes require energy for growth, repair, movement, and many cellular activities.
  3. Check the answer: The correct answer is Energy powers processes such as growth, repair, movement, and transport..

Life processes require energy for growth, repair, movement, and many cellular activities.

10. QuestionMultiple choice

Which statement best describes an organism's response to a changing environment?

Please select an answer first.

Correct answer: B

The correct answer is The organism detects a change and adjusts its activity or behavior..

  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: Responses allow organisms to react to environmental changes and support survival.
  3. Check the answer: The correct answer is The organism detects a change and adjusts its activity or behavior..

Responses allow organisms to react to environmental changes and support survival.

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