Ch 6 Life Science: Changes Over Time Test

25 Questions | Total Attempts: 39

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Ch 6 Life Science: Changes Over Time Test

Ch 6 Life Science: Changes Over Time Test


Questions and Answers
  • 1. 
    A species is a group of similar organisms that...
    • A. 

      Can mate with each other and produce fertile offspring.

    • B. 

      Can live together on an island.

    • C. 

      Can migrate to an island from the mainland.

    • D. 

      All have exactly the same traits.

  • 2. 
    What did Darwin infer from his observations of organisms in South America and the Galapagos Islands?
    • A. 

      The organisms on the Galapagos Islands were virtually identical to mainland organisms.

    • B. 

      A small number of different plant and animal species had come to the mainland from the Galapagos Islands.

    • C. 

      The organisms on the Galapagos Islands were completely unrelated to mainland organisms.

    • D. 

      A small number of different plant and animal species had come to the Galapagos Islands from the mainland.

  • 3. 
    Differences between members of the same species are called...
    • A. 

      Predators

    • B. 

      Selections

    • C. 

      Traits

    • D. 

      Variations

  • 4. 
    What is the role of genes in evolution?
    • A. 

      Only genes can be acted on by natural selection.

    • B. 

      Parents with recessive genes die from overproduction.

    • C. 

      The genes of most surviving parents have only dominant alleles.

    • D. 

      Only traits that are controlled by genes can be acted on my natural selection.

  • 5. 
    What are fossils?
    • A. 

      Molds and casts of organisms that live today.

    • B. 

      Drawings of ancient animals and other organisms.

    • C. 

      Footprints or burrows of small animals that live today.

    • D. 

      The preserved remains or traces of organisms that lived in the past.

  • 6. 
    How long is Precambrian Time in Geologic Time Scale?
    • A. 

      4 million years

    • B. 

      4.6 million years

    • C. 

      4 billion years

    • D. 

      4.6 billion years

  • 7. 
    What theory proposes that evolution occurs steadily in tiny changes over long periods of time?
    • A. 

      Gradualism

    • B. 

      Relative dating

    • C. 

      Natural selection

    • D. 

      Punctuated equilibria

  • 8. 
    What theory agrees with fossil records that show no intermediate forms for long periods of time?
    • A. 

      Gradualism

    • B. 

      Natural selection

    • C. 

      Evolution

    • D. 

      Punctuated equilibria

  • 9. 
    Which term refers to similar structures that related species have inherited from a common ancestor?
    • A. 

      DNA sequences

    • B. 

      Developmental organisms

    • C. 

      Homologous structures

    • D. 

      Punctuated equilibria

  • 10. 
    If two organisms look very similar during their early stages of development, this is evidence that the organisms...
    • A. 

      Are not related.

    • B. 

      Evolved from different ancestors.

    • C. 

      Have exactly the same DNA.

    • D. 

      Evolved from a common ancestor.

  • 11. 
    A branching tree is...
    • A. 

      A diagram showing how scientists think different groups of organisms are related.

    • B. 

      A species of tree that is not closely related to other tree species.

    • C. 

      A drawing that shows where different animals live in a tree.

    • D. 

      A homologous structure that many plants have.

  • 12. 
    Scientists combine evidence from fossils, body structures, early development, DNA and protein structures to ...
    • A. 

      Determine what bones an animal has in its forelimbs.

    • B. 

      Determine the evolutionary relationships among species.

    • C. 

      Decide which fossils are older than others.

    • D. 

      Determine whether an organism will have gills during its early development.

  • 13. 
    What did Darwin observe about finches in the Galapagos Islands?
    • A. 

      Their feathers were adapted to match their environment.

    • B. 

      Their beaks were adaptations related to the foods the finches ate.

    • C. 

      They had identical phenotypes in all locations.

    • D. 

      They had identical genotypes in all locations.

  • 14. 
    The gradual change in a species over time is called...
    • A. 

      Mutation

    • B. 

      Evolution

    • C. 

      Migration

    • D. 

      Variation

  • 15. 
    A trait that helps an organism survive and reproduce is called a(n)...
    • A. 

      Mutation

    • B. 

      Selection

    • C. 

      Adaptation

    • D. 

      Variation

  • 16. 
    Which term refers to the process by which individuals that are better adapted to their environment are more likely to survive and reproduce?
    • A. 

      Natural selection

    • B. 

      Overproduction

    • C. 

      Competition

    • D. 

      Variation

  • 17. 
    Darwin concluded that organisms on the Galapagos Islands..
    • A. 

      Had changed over time.

    • B. 

      Had remained the same.

    • C. 

      Were the result of selective breeding.

    • D. 

      Had no variations.

  • 18. 
    Which of these is one of the main ways that new species forms?
    • A. 

      Cross-breeding occurs within the species.

    • B. 

      A group is separated from the rest of the species.

    • C. 

      Competition occurs between members of the species.

    • D. 

      Mutations occur in the alleles of members of the species.

  • 19. 
    Which term refers to a species that no longer has any living members?
    • A. 

      Molded

    • B. 

      Fossilized.

    • C. 

      Extinct.

    • D. 

      Petrified.

  • 20. 
    Which theory proposes that species evolve during short periods of rapid change?
    • A. 

      Gradualism

    • B. 

      Evolution

    • C. 

      Absolute dating

    • D. 

      Punctuated equilibria

  • 21. 
    Which term refers to a species creating more offspring than can possibly survive?
    • A. 

      Natural selection

    • B. 

      Overproduction

    • C. 

      Evolution

    • D. 

      Variation

  • 22. 
    Which evidence suggests that the ancestors of whales once walked on land?
    • A. 

      Scientists have found fossils of whale like creatures that had legs.

    • B. 

      Whales perform walking motions as they swim.

    • C. 

      Whales have similar DNA to elephants.

    • D. 

      Whales breathe through lungs.

  • 23. 
    How does natural selection lead to evolution?
    • A. 

      Stronger offspring kill weaker members of the species.

    • B. 

      Helpful variations accumulate among surviving members of the species.

    • C. 

      Overproduction provides food fro stronger members of the species.

    • D. 

      Environmental changes favor weaker members of the species.

  • 24. 
    Why do scientists think related species have similar body structures and development patterns?
    • A. 

      The species inherited many of the same genes from each other.

    • B. 

      The species inherited many of the same proteins from each other.

    • C. 

      The species inherited all of the same genes from a common ancestor.

    • D. 

      The species inherited many of the same genes from a common ancestor.

  • 25. 
    Which of the following is most likely to become preserved as a fossil?
    • A. 

      A leaf

    • B. 

      A worm

    • C. 

      A jellyfish

    • D. 

      A clam shell

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