ACT Science

ACT Science Section

40 questions in 35 minutes across 6–7 passages. This section tests your ability to interpret data, analyze experiments, and evaluate competing scientific arguments.

40 questions
35 minutes
6–7 passages

This Is NOT a Science Knowledge Test

The ACT Science section is really a data interpretation and scientific reasoning test. You do not need to know biology, chemistry, or physics facts. Everything you need is provided in the passages, graphs, and tables. Think of it as an open-book data analysis exam.

Three Passage Formats

Every ACT Science section contains these three types of passages. Knowing the format helps you approach each one efficiently.

Data Representation

~15 questions

2–3 passages

Graphs, tables, charts, and diagrams similar to what you would find in scientific journals and textbooks.

Read and interpret graphs (line, bar, scatter plots)
Extract specific data points from tables
Identify trends, patterns, and correlations
Interpolate and extrapolate from data sets
Compare data across multiple figures

Research Summaries

~18 questions

3 passages

Descriptions of one or more related experiments, including methods, results, and conclusions.

Understand experimental design and methodology
Identify independent, dependent, and control variables
Analyze how changing variables affects outcomes
Evaluate whether conclusions are supported by results
Predict outcomes if experimental conditions change

Conflicting Viewpoints

~7 questions

1 passage

Two or more scientists, students, or theories present different explanations for the same phenomenon.

Identify the key claim of each viewpoint
Determine where viewpoints agree and disagree
Evaluate which evidence supports which viewpoint
Identify strengths and weaknesses of each argument
Determine which new data would resolve the disagreement

Science Topics You May Encounter

The passages cover a wide range of sciences, but remember — you are being tested on reasoning, not knowledge.

Biology
Chemistry
Physics
Earth Science
Astronomy
Ecology
Genetics
Meteorology
Botany
Zoology
Geology
Medicine

All necessary information is provided in the passages — no prior knowledge of these topics is required.

Tips & Strategies

Expert advice for ACT Science

Science Knowledge Is NOT Required

Everything you need to answer is in the passage. The ACT tests data literacy and reasoning, not memorized science facts.

Read the Questions First

For Data Representation passages, scan the questions before studying the graphs. This focuses your attention on relevant data.

Focus on Trends, Not Details

When reading graphs, identify the overall trend (increasing, decreasing, constant) before looking at specific values.

5 Minutes Per Passage

With 6–7 passages in 35 minutes, spend about 5 minutes each. Skip a difficult passage and return if time allows.

Save Conflicting Viewpoints for Last

This passage type requires the most reading. Handle the data-heavy passages first while you are fresh and have momentum.

Watch Axis Labels and Units

Many wrong answers come from misreading axes or confusing units. Always check what each axis measures and its scale.

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