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K12 LibreTexts

1.12: The Nature of Science- Challenge 2

  • Page ID
    5320
  • 1. If I want to do an experiment to test whether vitamin C helps prevent colds, the control group must ___.
    not be given vitamin C
    2. In an experiment to test whether vitamin C prevents getting a cold or not, the sample population is divided into two groups so that one group receives the vitamin C dose and one group does not. Which of these is a control group?
    The group that doesn't receive vitamin C.
    3. An experiment is conducted to check the effect of migraine pills on people. Out of 100 people, 50 were given migraine pills. What is the control group in this case?
    People who didn't receive migraine pills.
    4. A ___ can become a theory if it is thoroughly tested and passes all tests, ensuring that there are no lingering problems with it.
    hypothesis
    5. Scientists can use theory to ___.
    offer reliable explanations
    6. What is the relationship between a theory and a hypothesis?
    If a hypothesis is supported by multiple lines of evidence, it may become a theory.
    7. Natural selection is often described as ___.
    survival of the fittest
    8. A fast-acting insecticide was sprayed on a large population of cockroaches. Some cockroaches that are resistant to this insecticide survived. This is an example of ___.
    survival of the fittest
    9. ___ may have been present during times of low sea level.
    Land bridges
    10. What are some limitations of scientific models?
    Models show only a portion of a system.
    11. Manipulation of a model ___.
    can be done far more easily than the system it represents
    12. A model ___.
    deals with only a portion of a system
    13. Scientists engage in ___ review to make sure that work is of high quality prior to publication.
    peer
    14. ___ is an evaluation of work conducted by qualified people in a field before the work is published.
    Peer review
    15. Scientists who are part of a peer review can ___.
    recommend or deny a paper for publication