Plants and Their Sensitivity
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Questions and Answers

Which of the following is an example of an animal response to stimuli?

  • Production of enzymes (correct)
  • Flowering
  • Production of growth regulators
  • Growth
  • Which of the following is an example of an external factor that regulates plant growth?

  • Temperature
  • Production of growth regulators
  • Light intensity (correct)
  • Day length
  • What happens to deciduous trees as the days get shorter?

  • They shed their leaves (correct)
  • They produce heat shock proteins
  • They grow and reproduce
  • They modify their growth
  • Which of the following adaptations do chilies have to protect themselves from animals?

    <p>They have oils that cause a burning sensation in the mouth</p> Signup and view all the answers

    What is the purpose of the sharp thorns on a Hawthorn bush?

    <p>To discourage animals from eating it</p> Signup and view all the answers

    Which of the following adaptations do nettles have to protect themselves from animals?

    <p>They have stings containing formic acid</p> Signup and view all the answers

    Which hormone is responsible for stem elongation and root and shoot development?

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

    Which scientist discovered that phototropism is controlled by a mobile chemical signal?

    <p>Peter Boysen-Jensen</p> Signup and view all the answers

    What is the effect of a high concentration of auxin near the growing tip of a stem?

    <p>Promotes lateral bud growth</p> Signup and view all the answers

    What is the growth response of a plant to touch called?

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

    What are the external factors that regulate the growth of plants?

    <p>Light intensity, day length, gravity, and temperature</p> Signup and view all the answers

    Which type of factors control growth located inside the plant?

    <p>Internal factors</p> Signup and view all the answers

    What happens to deciduous trees as the days get shorter?

    <p>Deciduous trees shed their leaves</p> Signup and view all the answers

    Which of the following adaptations do gorse plants have to protect themselves from animals?

    <p>Gorse plants have hard, stiff, pointed leaves</p> Signup and view all the answers

    What is the purpose of the oils in chilies?

    <p>The oils in chilies cause a burning sensation in the mouth</p> Signup and view all the answers

    What is the growth response of a plant to water called?

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

    What is the main effect of auxins on cell elongation?

    <p>Auxins cause the cells to absorb more water and swell in size.</p> Signup and view all the answers

    Which of the following is NOT a main effect of auxins?

    <p>Leaf growth</p> Signup and view all the answers

    What is the role of the high concentration of auxin near the growing tip of a stem?

    <p>It inhibits the growth of lateral buds and keeps them dormant.</p> Signup and view all the answers

    Which of the following is an example of a tropism?

    <p>The growth of a stem towards light</p> Signup and view all the answers

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