TEAS Science · Practice Question

    Scientific Reasoning and Hypotheses: TEAS Practice Question with Answer & Explanation

    An original TEAS 7-style science practice question, written for nursing-school applicants — with a full breakdown of every answer choice.

    Question

    Historically, parasitic worm infestations have been classified strictly as harmful to human health. However, recent clinical studies suggest that these infestations may actually dampen overactive immune responses in patients with Crohn's disease. Based on this new evidence, how should the initial hypothesis regarding parasitic worms be revised?

    • A.Worm infestation is always beneficial to human health.
    • B.Worm infestation can have both detrimental and therapeutic effects on a host.
      Correct
    • C.Worm infestation should be avoided at all costs to prevent immune system failure.
    • D.Autoimmune disorders are caused exclusively by a lack of parasitic worms.

    Correct answer: B. When new data contradicts an old hypothesis, the hypothesis must be revised to include the new findings. Choice B reflects both the harm and the help.

    Understanding the Modification of Scientific Hypotheses

    In the study of science, hypotheses are not "set in stone." They are tentative explanations that must be adjusted when new, credible data emerges. This question tests your ability to integrate new clinical findings into an existing scientific framework—a common theme on the TEAS 7 Science section.

    Why Choice B is Correct

    The original hypothesis stated that worms are strictly "damaging" (harmful). The new evidence suggests they can "relieve" (be helpful) in specific contexts like autoimmune disorders. To be scientifically accurate, the new hypothesis must account for both sets of facts.

    • Choice B is the most balanced and accurate revision: "Worm infestation can have both detrimental and therapeutic effects on a host." It acknowledges the traditional view of damage while incorporating the new therapeutic potential discovered in the Crohn's disease study.

    Analysis of Incorrect Options

    • Choice A: This is an overgeneralization. While the study shows some relief for autoimmune issues, worms can still cause malnutrition, organ damage, and anemia. They are not "always beneficial."
    • Choice C: This choice ignores the new evidence provided in the prompt. If science only stuck to old beliefs when new data appeared, medicine would never progress.
    • Choice D: This is a logical fallacy. Just because a worm relieves a symptom doesn't mean the lack of worms is the sole cause of the entire disease. Autoimmune disorders are complex and multifactorial (genetic, environmental, and lifestyle).

    TEAS Concept: The Nature of Scientific Inquiry

    The TEAS exam expects you to understand that science is iterative. When experimental results contradict a hypothesis:

    1. The data is analyzed for validity.
    2. The original hypothesis is either rejected or modified.
    3. The modified hypothesis is tested again.

    In this scenario, we move from a "unidirectional" hypothesis (worms = bad) to a "bidirectional" or nuanced hypothesis (worms = context-dependent).

    Memory Tip for Science Revision Questions

    When you see a question asking to "modify a hypothesis," look for the answer choice that combines the old information with the new information. Avoid "absolute" words like always, never, or only unless the data specifically supports such a rigid conclusion.

    Quick study tip: In scientific reasoning, always choose the answer that best fits ALL the provided data, not just part of it.

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