Responses & Reflexes in Organisms Quiz
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Questions and Answers

What is the term used to describe an organism's movement towards a favorable stimulus?

  • Positive taxis (correct)
  • Negative phototaxis
  • Positive chemotaxis
  • Negative gravitropism
  • In roots, what effect does a high concentration of IAA have on cell elongation?

  • Causes cells to shrink
  • Inhibits cell elongation (correct)
  • Stimulates cell elongation
  • Has no effect on cell elongation
  • What is the term for an organism's response to move away from an unfavorable stimulus?

  • Positive phototaxis
  • Negative taxis (correct)
  • Positive gravitropism
  • Positive gravitaxis
  • Which response involves an organism changing its speed and direction of movement based on stimuli?

    <p>Kinesis</p> Signup and view all the answers

    What type of response do bacteria exhibit when moving towards certain chemicals for survival?

    <p>Positive chemotaxis</p> Signup and view all the answers

    When woodlice must be in damp areas to prevent excessive water loss, what kind of movement response do they exhibit?

    <p>Kinesis response</p> Signup and view all the answers

    What is the name given to the structures that cause a response in organisms?

    <p>Effector</p> Signup and view all the answers

    Indoleacetic acid (IAA) is an example of a growth factor that controls which plant response mechanism?

    <p>Tropism</p> Signup and view all the answers

    Which plant part produces indoleacetic acid (IAA) that causes cell elongation in shoots?

    <p>Shoot tip cells</p> Signup and view all the answers

    What type of tropism occurs when plants grow towards a stimulus?

    <p>Positive tropism</p> Signup and view all the answers

    In phototropism, where does indoleacetic acid (IAA) diffuse when there is unilateral light?

    <p>Towards the shaded side of the shoot</p> Signup and view all the answers

    Why do roots not exhibit phototropism?

    <p>Because they anchor the plant and do not need to bend towards light</p> Signup and view all the answers

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