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Natural Selection and Adaptation Practice Tests

These Grade 8 Science practice tests cover inherited variation, mutations, natural selection, fitness, environmental pressures, adaptations, artificial selection, common ancestry, population change, and evidence from DNA, fossils, anatomy, and geography.

Skills covered

  • Connecting inherited variation to survival and reproductive success
  • Explaining how environmental pressures change trait frequencies in populations
  • Distinguishing individual responses from population-level evolution
  • Using fossils, DNA, anatomy, and biogeography as evolutionary evidence
  • Interpreting graphs, models, investigations, and adaptation examples

How to use these practice tests

Identify the population, inherited trait, environmental condition, and reproductive outcome in each question. Then decide whether the evidence supports natural selection, adaptation, common ancestry, or another population process.

For more Grade 8 Science practice, return to the Grade 8 Science category.

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1. Test

Grade 8 Natural Selection and Adaptation Practice Tests

Practice Grade 8 Science questions about inherited variation, natural selection, adaptations, common ancestry, population change, and evolutionary evidence.

Choose the best answer. Identify inherited variation, environmental pressures, population changes, and the evidence that supports each conclusion.

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

What is variation in a population?

Please select an answer first.

Correct answer: A

The correct answer is Differences in traits among individuals of the same species.

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Variation means that individuals in a population differ in traits such as color, size, or resistance.
  3. Check the population result: The correct choice is Differences in traits among individuals of the same species.

Variation means that individuals in a population differ in traits such as color, size, or resistance.

2. QuestionMultiple choice

What makes a trait useful to natural selection?

Please select an answer first.

Correct answer: B

The correct answer is It is inherited and affects survival or reproduction..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Natural selection can change a population when inherited differences affect an organisms ability to survive or reproduce.
  3. Check the population result: The correct choice is It is inherited and affects survival or reproduction..

Natural selection can change a population when inherited differences affect an organisms ability to survive or reproduce.

3. QuestionMultiple choice

What is natural selection?

Please select an answer first.

Correct answer: C

The correct answer is A process in which individuals with helpful inherited traits tend to leave more offspring.

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Natural selection changes trait frequencies across generations because some inherited traits improve reproductive success in a particular environment.
  3. Check the population result: The correct choice is A process in which individuals with helpful inherited traits tend to leave more offspring.

Natural selection changes trait frequencies across generations because some inherited traits improve reproductive success in a particular environment.

4. QuestionMultiple choice

What does biological fitness mean in natural selection?

Please select an answer first.

Correct answer: D

The correct answer is How successfully an organism survives and reproduces in its environment.

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Fitness refers to reproductive success in a specific environment, not simply size, strength, or lifespan.
  3. Check the population result: The correct choice is How successfully an organism survives and reproduces in its environment.

Fitness refers to reproductive success in a specific environment, not simply size, strength, or lifespan.

5. QuestionMultiple choice

What is an adaptation?

Please select an answer first.

Correct answer: A

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

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: An adaptation is an inherited characteristic that provides an advantage under particular environmental conditions.
  3. Check the population result: The correct choice is An inherited trait that improves survival or reproduction in a particular environment.

An adaptation is an inherited characteristic that provides an advantage under particular environmental conditions.

6. QuestionMultiple choice

How can a mutation affect natural selection?

Please select an answer first.

Correct answer: B

The correct answer is It can create a new genetic variation that may be helpful, harmful, or neutral..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Mutations are one source of genetic variation, and selection may increase, decrease, or not affect the resulting trait.
  3. Check the population result: The correct choice is It can create a new genetic variation that may be helpful, harmful, or neutral..

Mutations are one source of genetic variation, and selection may increase, decrease, or not affect the resulting trait.

7. QuestionMultiple choice

What changes directly as natural selection acts over generations?

Please select an answer first.

Correct answer: C

The correct answer is The frequency of traits or alleles in a population.

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Natural selection acts on individuals, but the measurable evolutionary change occurs in populations across generations.
  3. Check the population result: The correct choice is The frequency of traits or alleles in a population.

Natural selection acts on individuals, but the measurable evolutionary change occurs in populations across generations.

8. QuestionMultiple choice

Which statement about an individual organism and adaptation is correct?

Please select an answer first.

Correct answer: D

The correct answer is An individual can develop a behavior, but evolution is a population change across generations..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Individuals may adjust behavior or physiology, but inherited population changes over generations are evolution.
  3. Check the population result: The correct choice is An individual can develop a behavior, but evolution is a population change across generations..

Individuals may adjust behavior or physiology, but inherited population changes over generations are evolution.

9. QuestionMultiple choice

Why can the same trait be helpful in one environment but harmful in another?

Please select an answer first.

Correct answer: A

The correct answer is The advantage of a trait depends on environmental conditions..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Selection favors traits that fit current conditions, so an advantage can change when the environment changes.
  3. Check the population result: The correct choice is The advantage of a trait depends on environmental conditions..

Selection favors traits that fit current conditions, so an advantage can change when the environment changes.

10. QuestionMultiple choice

What is the best evidence that a trait is influenced by natural selection?

Please select an answer first.

Correct answer: B

The correct answer is The trait is inherited, varies in the population, and is linked to different reproductive success..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Variation, inheritance, and differences in survival or reproduction are the key conditions for natural selection.
  3. Check the population result: The correct choice is The trait is inherited, varies in the population, and is linked to different reproductive success..

Variation, inheritance, and differences in survival or reproduction are the key conditions for natural selection.

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