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Indiana State Assessments · ILEARN Biology ECA

Indiana ILEARN Biology ECA Practice Test

Build Indiana Biology readiness with five focused 10-question practice sets covering cells, genetics, ecology, evolution, energy, scientific practices, data, and evidence.

Indiana ILEARN Biology ECA practice sets

This Indiana ILEARN Biology ECA Practice Test page provides five short practice sets with 10 original multiple-choice questions each. The sets cover cells and genetics, ecology and evolution, matter and energy in organisms, scientific practices and data, and integrated biology review.

Biology ECA skills

The Indiana Department of Education identifies ILEARN Biology as an end-of-course assessment completed after students finish a high school Biology course. These supplemental sets practice biological systems, heredity, energy and matter, ecology, evolution, models, data analysis, and evidence-based explanations.

How to use this page

Complete one 10-question set at a time. Read every model, graph, table, and evidence statement carefully, then review the explanation after each response.

This is supplemental State Test Practice, State Assessment Practice, and Standardized Test Practice. It does not replace current Indiana Department of Education guidance, official materials, accommodations, or testing procedures.

For broader grade-level study paths, explore Elementary School Tests, Middle School Tests, and High School Tests.

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Indiana ILEARN Biology ECA Practice Questions

A 10-question Indiana ILEARN Biology ECA practice set on scientific practices and data, with answers and explanations.

Read each scenario, model, data table, or investigation carefully, choose one answer, and review the explanation after responding.

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

What is the independent variable in an experiment?

Please select an answer first.

Correct answer: A

The correct answer is The variable the investigator changes..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: The independent variable is intentionally changed to test its effect.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

The independent variable is intentionally changed to test its effect.

2. QuestionMultiple choice

What is the dependent variable?

Please select an answer first.

Correct answer: B

The correct answer is The outcome that is measured..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: The dependent variable is the measured response to the independent variable.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

The dependent variable is the measured response to the independent variable.

3. QuestionMultiple choice

Why should a control group be included when possible?

Please select an answer first.

Correct answer: C

The correct answer is It provides a comparison for the treatment group..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: A control group helps show whether the treatment is associated with a change.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

A control group helps show whether the treatment is associated with a change.

4. QuestionMultiple choice

A graph shows plant growth for four fertilizer levels. Which graph type is usually useful for showing a relationship between two numerical variables?

Please select an answer first.

Correct answer: D

The correct answer is A scatter plot.

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: A scatter plot displays pairs of numerical values and can show association.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

A scatter plot displays pairs of numerical values and can show association.

5. QuestionMultiple choice

A student repeats a trial and obtains similar results. What does this improve?

Please select an answer first.

Correct answer: A

The correct answer is Reliability.

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: Similar repeated results increase confidence that the procedure is reliable under those conditions.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

Similar repeated results increase confidence that the procedure is reliable under those conditions.

6. QuestionMultiple choice

A data point is far from all the others. What should a scientist do first?

Please select an answer first.

Correct answer: B

The correct answer is Check the measurement and procedure..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: An unusual value should be checked before deciding whether it reflects error or a real pattern.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

An unusual value should be checked before deciding whether it reflects error or a real pattern.

7. QuestionMultiple choice

Which statement is an observation rather than an inference?

Please select an answer first.

Correct answer: C

The correct answer is The solution changed from clear to blue..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: The color change is directly observed; the other statements interpret or predict information.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

The color change is directly observed; the other statements interpret or predict information.

8. QuestionMultiple choice

Why should a scientific claim be connected to evidence?

Please select an answer first.

Correct answer: D

The correct answer is Evidence provides support for the claim..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: A claim is stronger when relevant observations or data support it.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

A claim is stronger when relevant observations or data support it.

9. QuestionMultiple choice

An experiment changes light and water at the same time. What is difficult to determine?

Please select an answer first.

Correct answer: A

The correct answer is Which variable caused the observed effect..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: Changing two variables makes it difficult to isolate the cause of a result.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

Changing two variables makes it difficult to isolate the cause of a result.

10. QuestionMultiple choice

What is the purpose of a biological model?

Please select an answer first.

Correct answer: B

The correct answer is To represent a structure, system, or process..

  1. Read the Biology ECA task: Identify the biological system, evidence, relationship, or mechanism described in the question.
  2. Use the evidence: Models simplify or represent biological systems so relationships can be examined.
  3. Check the claim: Confirm that the answer is supported by the model, data, scenario, or biological principle.

Models simplify or represent biological systems so relationships can be examined.

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Frequently asked questions about Indiana ILEARN Biology ECA Practice

When is the Indiana Biology ECA taken?

The Indiana Department of Education identifies the Biology End-of-Course Assessment as an ILEARN assessment taken upon completion of the high school Biology course. Check the official ILEARN page for current participation guidance.

Which biology skills are included?

The practice sets include cells, genetics, ecology, evolution, matter and energy, homeostasis, scientific practices, data analysis, models, and evidence-based reasoning.

Are these official Biology ECA questions?

No. These are original supplemental practice questions. Check the official Indiana Department of Education ILEARN page for current blueprints, released items, accommodations, and testing procedures.