Internal Rhythms and Biological Clocks
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Questions and Answers

What term is used to describe the 24-hour biological cycle in organisms?

  • Diurnal rhythm
  • Circadian rhythm (correct)
  • External rhythm
  • Nocturnal rhythm
  • What does the Latin word 'nocte' mean?

  • Month
  • Year
  • Night (correct)
  • Day
  • Which of the following is NOT affected by the circadian rhythm?

  • Metabolic rate
  • Hair color (correct)
  • Body temperature
  • Cell division
  • How do external cues help the body's internal clock?

    <p>They calibrate the internal clock to exactly 24 hours</p> Signup and view all the answers

    What happens to the body's internal clock in the absence of external stimuli?

    <p>It continues to run normally</p> Signup and view all the answers

    What keeps our internal clocks on track?

    <p>The changing of day to night and night to day</p> Signup and view all the answers

    Why do we experience 'jet lag' when quickly changing time zones?

    <p>Our internal biological clock needs time to adjust</p> Signup and view all the answers

    Where is the biological clock located in mammals?

    <p>In a small cluster of nerve cells in the hypothalamus</p> Signup and view all the answers

    Why are biological clocks different from other metabolic processes?

    <p>They are not affected by temperature changes</p> Signup and view all the answers

    Why is it important for plants to keep track of the time of year?

    <p>To know when to flower based on sunlight received</p> Signup and view all the answers

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