Bio Pak 7 Self-check Quiz--ch 12

6 Questions

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Earth Quizzes & Trivia

This is a short quiz over Ch 12, History of the Earth.


Questions and Answers
  • 1. 
    Chloroplasts and mitochondria are both thought to have evolved through the process of
    • A. 

      Photosynthesis.

    • B. 

      Chemical reactions.

    • C. 

      Endosymbiosis.

    • D. 

      Cellular respiration

  • 2. 
    Every chemical element has its own unique half life.
    • A. 

      True

    • B. 

      False

  • 3. 
    What percentage of potassium-40 remains after two half-lives?
    • A. 

      50%

    • B. 

      100%

    • C. 

      75%

    • D. 

      25%

  • 4. 
    The model stating that organic molecules present in ancient seas led to the formation of life’s building blocks was the
    • A. 

      Primordial soup model.

    • B. 

      Radioactive decay model.

    • C. 

      Bubble model.

    • D. 

      None of the above

  • 5. 
    Two-thirds of all terrestrial life disappeared at the end of the Cretaceous Period, in the last mass extinction,  approximately
    • A. 

      440 million years ago.

    • B. 

      360 million years ago.

    • C. 

      65 million years ago.

    • D. 

      245 million years ago.

  • 6. 
    A layer of ozone in the atmosphere was critical to the formation of life on land because
    • A. 

      Land plants need ozone for photosynthesis.

    • B. 

      There is a high concentration of ozone in the oceans.

    • C. 

      Ozone is necessary in order to produce oxygen.

    • D. 

      Ozone blocks ultraviolet radiation.