What Science Is on the ACT? All You Need to Know

The ACT Science section doesn’t test how much science you’ve memorized. Instead, it measures your ability to read graphs, analyze experiments, and interpret data quickly. Many students ask what science is on the ACT, and the answer is more about skills than facts.

In this blog, you’ll learn what science is on the ACT, the types of passages and questions included, and key strategies to boost your score. With the right approach, you can walk into test day prepared and confident.

• Overview of the ACT Science Section
• What Science Is on the ACT Test?
• Top Science ACT Tips to Boost Your Score
• Frequently Asked Questions
• Takeaways

Overview of the ACT Science Section

The ACT Science section is designed to measure how well you can interpret information, analyze data, evaluate arguments, and solve problems in the natural sciences. Instead of testing memorization, it presents real scientific scenarios and asks you multiple-choice questions that show how you handle data and reasoning.

The material comes from biology, chemistry, physics, and Earth and space sciences such as geology, astronomy, and meteorology. You are not expected to know advanced details from these fields, but general knowledge from high school science classes may help with some questions.

What makes this section different is its focus on both content and skills. You may be asked to:

• Recognize the key features of data and concepts
• Examine the link between evidence and the conclusions drawn
• Extend information to make predictions or draw new conclusions

Calculators are not permitted on this part of the test, so your success depends on analysis and critical reading rather than computation.

To prepare effectively, you also need to understand the structure of the ACT Science section, including its timing and question setup.

Format

The ACT Science section is the fourth part of the exam. You’ll answer 40 multiple-choice questions in 40 minutes, which gives you less than a minute per question. Time management is critical, since many students underestimate this section and assume it’s about memorizing science facts. The real challenge is working quickly with new information.

The section includes seven passages built around scientific data, experimental results, or differing viewpoints. Some passages are straightforward, like charts and tables, while others—such as conflicting viewpoints—require more complex reasoning.

Every question has four answer choices, and there is no penalty for guessing. To manage pacing, some students skim the passage first, while others move straight to the questions and return to the passage as needed. Practice both strategies to find what works best.

Because the clock moves fast, even strong science students can lose points by overanalyzing a single chart or debating one question for too long. Timed drills are one of the best ways to sharpen both speed and confidence before test day.

Passage types

The ACT Science section features three main passage types: data representation, research summaries, and conflicting viewpoints. Each requires a slightly different approach but all test your ability to think like a scientist rather than recall facts.

• Data representation. Charts, tables, or graphs. You read visuals, identify trends, and make predictions. These are often the most straightforward since all the information is provided.
• Research summaries. Descriptions of one or more experiments. Expect questions about hypotheses, variables, controls, and results. These are wordier, so efficient reading matters.
• Conflicting viewpoints. Different theories or opinions on the same issue. Instead of numbers, you’ll compare arguments and evaluate logic. For example, scientists might disagree on how a planet’s atmosphere formed.

Every ACT includes a mix of these passage types. Practicing each one helps you quickly recognize what you’re facing, saving time for the actual questions.

Question types

Questions on the ACT Science section are not divided by subject matter but by skills. They fall into three categories: interpretation of data, scientific investigation, and evaluation of models or conclusions.

• Interpretation of data. The most common. You’ll pull information from graphs or tables, spot patterns, or predict outcomes, such as what happens to a chemical reaction when the temperature increases.
• Scientific investigation. Focuses on experimental design. You may need to identify variables, recognize controls, or spot possible errors, reflecting how real experiments are evaluated.
• Evaluation of models or conclusions. Often tied to conflicting viewpoints. You’ll compare hypotheses, analyze reasoning, and decide which explanation fits the evidence best.

By practicing all three, you’ll build the flexibility to handle any question type. The ACT is not designed to trick you with obscure science details but tests how well you process and reason through information under time pressure.

Scoring

The ACT Science section is scored on the standard 1–36 scale. Your raw score is the number of correct answers out of 40, which is then converted to a scaled score to account for test difficulty. Since wrong answers are not penalized, leaving questions blank can only hurt your score.

Your science score also contributes to your STEM score, which is the average of your Math and Science results. STEM-focused colleges often look at this number closely because it reflects both quantitative and scientific reasoning skills.

A strong science score signals that you can handle the data-heavy analysis found in college labs and research courses. A weaker score, on the other hand, may raise concerns about readiness for STEM work.

Consistency is key if you want a top percentile score. Missing just a few questions can drop you several points on the scaled score. For instance, answering 34 correctly might result in a 31 or 32, while missing only a couple more could push your score into the high 20s. This is why both pacing and accuracy matter.

What Science Is on the ACT Test?

Many students think the ACT Science section is a quiz on biology, chemistry, or physics, but it isn’t. So what science is on the ACT? The test uses scientific contexts, but its real focus is on skills like data analysis and reasoning rather than memorized facts.

According to ACT, “[A]dvanced knowledge in these areas is not required, but background knowledge acquired in general, introductory science courses may be needed to correctly answer some of the questions.”

In practice, this means most of the 40 questions can be answered without recalling specific science content.

Only about two to four questions rely on basic facts you’ve learned in class. These are sprinkled across passages to make sure students have a baseline familiarity with science concepts. The rest of the section tests your ability to read graphs, follow experiments, and evaluate viewpoints.

When content-based questions do appear, they almost always involve foundational ideas. For example, a practice test included a question about pH values. To answer correctly, you only need to know that acids have lower pH values, bases have higher ones, and neutral solutions fall around 7. This type of knowledge is closer to middle school chemistry than advanced science.

Common scientific knowledge topics

Although you can’t predict the exact content, ACT practice tests reveal recurring themes. These are usually broad concepts from introductory science courses:

• Chemistry basics. pH (acids vs. bases), chemical equations, phase changes (solid, liquid, gas), endothermic vs. exothermic reactions, common chemical formulas (like H₂O, CO₂).
• Physics basics. Speed, force, drag, energy (potential vs. kinetic), energy transfers, boiling and freezing points.
• Biology basics. Osmosis, genotypes (dominant vs. recessive alleles), and simple genetics patterns.
• General skills. Using scientific notation, interpreting very large or very small numbers.

These topics are intentionally broad. The ACT isn’t designed to reward memorization of advanced theories. Instead, it ensures that every student can demonstrate basic science literacy while focusing primarily on reasoning and analysis.

ACT Science sample question

To see what ACT Science questions look like, here’s an official sample with the correct answer and a short explanation of the reasoning:

The correct answer is G, which is “external appearance of the male and female ducks is different.”

Both scientists’ theories rely on the idea that male ducks and female ducks do not look the same. Scientist 1 explains that females keep dull plumage, while males develop bright feathers that help females recognize the correct species and choose the healthiest mates. His theory depends on the contrast between the sexes.

Scientist 2 makes a different point but still uses the same idea. He argues that brightly colored males use their plumage to defend territory and warn other males. This works only if males are more colorful than females, who retain the duller appearance.

The other options can be ruled out. Choice F is incorrect because it says males and females look similar, which the passage clearly denies. Choice H is wrong because the males are described as standing out, not blending in. Choice J is incorrect because females are not more colorful; it is the males who develop bright plumage.

Both arguments depend on the same key fact: male and female ducks differ in their external appearance, making G the correct choice.

Top Science ACT Tips to Boost Your Score

Knowing what science is on the ACT is only half the battle. To raise your score, you need strategies that help you manage time, interpret data quickly, and approach each passage and question type with confidence. Here are some helpful tips:

1. Slow down and read the passage first.

Many students try to rush through the ACT Science section by skimming passages too quickly. While time is tight, skipping the reading step often leads to confusion and wasted time later.

The better approach is to start by carefully reviewing the passage, including all charts, tables, and figures. This gives you a roadmap before you dive into the questions and reflects what science is on the ACT—a test of reasoning more than memorization.

When you read, pay attention to the structure of the information. For instance, if it’s an experiment, note the setup, the variables, and the controls. These details often become the focus of later questions. Simply knowing what the independent and dependent variables are can help you eliminate wrong answer choices quickly.

Taking brief notes can also be helpful. You don’t need to write down everything, but jotting a few key words or marking important trends in a chart can anchor your memory. This prevents you from rereading the passage multiple times and saves you time overall.

2. Note conflicting viewpoints.

One of the unique features of ACT Science is the conflicting viewpoints passage. Instead of data and mathematical problems, these passages present two or more scientists or theories that disagree about the same scientific issue. Your job is to keep their perspectives straight and determine how the evidence supports each one.

The best way to approach these passages is to note the main idea of each viewpoint as you read. Remember, you don’t need to capture every detail. A simple phrase like “Scientist 1: Atmosphere formed by volcanoes” and “Scientist 2: Atmosphere formed by comets” can be enough. Having a quick summary on paper helps you avoid mixing up the arguments when the questions start asking for comparisons.

Questions in these passages often ask you to identify how one viewpoint differs from another, or which piece of evidence supports a particular claim. If you already have your notes, these questions become much easier. Instead of rereading the entire passage, you can glance at your summaries and go straight to the answer choices.

3. Don’t get distracted by jargon.

ACT Science passages often contain technical terms that sound intimidating, like spectrophotometer or hydrothermal vent. These words can make students freeze up, thinking they need to know advanced science to answer correctly.

The truth is that the test doesn’t expect you to memorize or define such terms. Most jargon is there as background context, not as the basis of the question.

Instead of worrying about vocabulary, focus on what the passage is actually showing you. In many cases, the questions are tied to trends in a graph, patterns in a table, or the setup of an experiment. Even if you don’t understand every word, you can still answer correctly by paying attention to the data.

4. Track your errors as you practice.

The most effective way to prepare for the ACT Science section is by working through real practice questions and full-length ACT practice tests. Practicing under realistic conditions is the only way to build the stamina and timing you’ll need on test day.

However, simply taking practice tests isn’t enough. To truly improve, you need to analyze your mistakes. Keep a record of every error you make, whether it happens on a passage, a specific type of question, or a particular scientific topic. This log will reveal patterns in your performance and help you better understand what science is on the ACT.

Most official ACT practice tests provide subscores that categorize questions into areas like interpretation of data or evaluation of models. Use these to sort your mistakes into groups. For example, you may discover that you struggle most with conflicting viewpoints passages or that you often misinterpret trends in graphs. Knowing this makes your study time much more efficient.

Once you know your weak spots, you can target them directly. If you’re missing questions in research summaries, practice breaking down experiment designs. If you struggle with evaluation of models, spend more time comparing arguments and focusing on logic.

Over time, this cycle of practice, error tracking, and targeted review builds consistency and confidence. Tracking your errors also helps shift your mindset. Instead of getting discouraged when you miss questions, you begin to see mistakes as clues about where to focus next.

Frequently Asked Questions

1. How many science passages are on the ACT?

If you’re wondering how many science passages are on the ACT, the answer is seven. Each passage comes with a set of multiple-choice questions, making up a total of 40 questions in total. Keep mind that these questions focus more on reasoning than memorized facts, which reflects what science is on the ACT.

2. What types of science are on the ACT?

Students often ask what types of science are on the ACT. The test includes passages from biology, chemistry, physics, and Earth or space sciences, but questions focus more on reasoning and data analysis than on advanced content.

3. What are some effective science ACT tips?

Some of the most effective ACT Science tips include reading each passage carefully, taking notes to track conflicting viewpoints, and not getting distracted by jargon. It also helps to review practice tests and record your errors so you can focus on weak areas.

Takeaways

• Understanding what science is on the ACT helps you see that the section tests reasoning and analysis more than memorized facts.
• Topics include biology, chemistry, physics, and Earth/space science, though just a few questions require prior knowledge.
• Following science ACT tips like reading passages carefully, noting conflicting viewpoints, ignoring jargon, and tracking errors in practice can significantly improve your score.
• A high ACT Science score shows colleges you can handle data-heavy coursework, especially in STEM fields.
• Science not your strength? Work with a private tutor to build confidence, sharpen strategies, and raise your ACT Science score.