Claims in Science: What Is Being Argued
A lot of science-test questions are really asking one quiet thing: can you tell what someone is claiming, and can you tell it apart from the reasons they give for it? A claim is a statement that something is true. It is the point of an argument — the thing the writer wants you to accept. Learn to spot the claim first, and the rest of a passage falls into place.
The reassuring part is that this is a reading skill, not a memory test. You do not need to already know whether the claim is right. You need to find it, state it plainly, and then judge whether the passage actually backs it up.
This lesson shows you how to identify a claim, separate it from evidence, and notice when a claim is stronger than the support behind it.
What Counts as a Claim
A claim is a statement you could agree or disagree with. “Sleeping at least eight hours improves memory” is a claim. “The students who slept eight hours scored higher” is not a claim — it is an observation, a piece of evidence. The claim is the general point; the evidence is the specific fact offered to support it.
Try this passage:
A study reports that students who slept at least eight hours scored higher on a memory test than students who slept less.
What is being claimed here? Strictly, the passage reports a result: more sleep went with higher scores. If someone then says “so sleep improves memory,” that is a broader claim built on top of the result. Keeping those two levels straight — the observed result versus the general claim — is exactly what the test rewards.
Find the Claim, Then Find Its Support
When you read an argument, do two things in order. First, underline (in your mind) the sentence that states what the writer wants you to believe. Second, list the sentences offered as support. Once they are separated, you can ask the real question: does the support actually justify the claim, or does the claim reach further than the evidence allows?
Watch for claim words that signal a general point: “therefore,” “this shows that,” “proves,” “causes,” “is the best.” These often mark the moment a writer steps from a specific result to a broad conclusion.
When a Claim Overreaches
A common test trap is a claim that sounds reasonable but goes past the evidence. If a study found that a group who exercised had lower stress, the safe claim is “exercise was linked to lower stress in this group.” The overreaching claim is “exercise cures stress for everyone.” Same evidence, much bigger claim.
Strong readers notice the size of a claim. Words like “all,” “always,” “never,” “proves,” and “cures” make a claim harder to support. Words like “may,” “suggests,” “is linked to,” and “in this sample” keep a claim in proportion to its evidence. On the test, the best answer is usually the one whose confidence matches the evidence — not the boldest statement.
Watch: A Short Video Lesson
PhysicistMichael walks through this skill clearly in a few minutes. It is a helpful companion to the reading above:
A Routine for Claim Questions
- State the claim in one sentence: what does the writer want me to accept?
- List the evidence: what specific facts are offered as support?
- Check the fit: does the evidence cover the whole claim, or only part of it?
- Watch the size words: does the claim say more than the evidence can carry?
Practice
- In your own words, what is a claim?
- “Plants near the window grew taller than plants in the closet.” Is this a claim or an observation?
- Which claim is safer given that result: “light helps these plants grow” or “light is the only thing that makes any plant grow”?
- Name two words that often signal an overreaching claim.
- Why should the confidence of a claim match its evidence?
- What is the first step when you meet an argument in a passage?
Answers
- A statement that something is true — a point you could agree or disagree with.
- An observation (a specific result), which could be used as evidence for a claim.
- “Light helps these plants grow” — it matches the evidence without overreaching.
- Any two of: all, always, never, proves, cures.
- Because a claim larger than its evidence is not well supported, and the test rewards well-matched conclusions.
- Find and state the claim before judging the support.
Where This Fits in Your Science Prep
Identifying claims sets up the next two reasoning skills: weighing the evidence behind a claim and drawing conclusions the evidence actually allows. It also prepares you for the classic trap of correlation versus causation. See every topic on the Science Topics Hub.
Recommended Prep Books
These study guides and practice books help you keep building momentum as you prepare:
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