ACT Science: What It Really Tests

The #1 Misconception

Most students think the ACT Science section tests science knowledge. It does not. It tests your ability to:

1. Read graphs, tables, and charts accurately
2. Understand experimental design (variables, controls, procedures)
3. Evaluate competing scientific explanations using evidence

You do NOT need to know biology, chemistry, or physics content. A student who has never taken a science class but can read data well will outscore a science major who reads data poorly.

Section Structure

Detail	Value
Time	30 minutes
Questions	40 (34 scored + 6 field test)
Passages	7
Questions per passage	5–7
Calculator	Not allowed

Three Passage Formats

Format	Count	Questions	What It Looks Like
Data Representation	3–4	15	Graphs, tables, charts with questions about reading and interpreting the data
Research Summaries	2–3	18	Descriptions of experiments with results. Questions about design, variables, and conclusions
Conflicting Viewpoints	1	7	Two or three scientists present different explanations. Questions ask you to compare and evaluate their reasoning

Data Representation Passages

These are the easiest. You are given figures (graphs, tables, scatter plots) and asked to:

• Read specific values ("According to Figure 1, what was the temperature at Day 5?")
• Identify trends ("As pressure increases, what happens to volume?")
• Interpolate ("Based on the graph, what would the value be at 25°C?")
• Compare data sets ("Which trial had the highest rate of reaction?")

Research Summary Passages

These describe 2–3 experiments and present their results. You need to understand:

• Independent variable: What the researcher changed
• Dependent variable: What the researcher measured
• Control: What was kept constant
• Purpose: Why the experiment was designed this way

Conflicting Viewpoints Passages

These are the hardest because they require more reading. Two or three scientists (or students, or hypotheses) present different explanations for the same phenomenon. Questions ask:

• What does Scientist 1 claim?
• On what point do the scientists agree/disagree?
• Which data would weaken Scientist 2's argument?
• If [new evidence] were found, which scientist's view would it support?

What You Do NOT Need to Know

The ACT Science section does not require you to know:

• Chemical formulas or element names beyond what the passage provides
• Biological processes beyond what the passage explains
• Physics equations beyond what the passage states
• Any content from your science classes that is not in the passage

Everything you need is in the passage. If a question seems to require outside knowledge, reread the passage — the answer is there.