植物学 TPO28-L3 Plants' photoreceptors

TPO28-L3

Plants’ photoreceptors

Listen to part of a lecture in a botany class.

 



  1. What is the lecture mainly about?
  • A. The differences in how humans and plants sense light.
  • B. An explanation of an experiment on color and wavelength.
  • C. How plants sense and respond to different wavelengths of light.
  • D. The process by which photoreceptors distinguish wavelengths of light.

 

  1. According to the professor, what is one way that a plant reacts to changes in the number of hours of sunlight?
  • A. The plant absorbs different wavelengths of light.
  • B. The plant begins to flower or stops flowering.
  • C. The number of photoreceptors in the plant increases.
  • D. The plant’s rate of photosynthesis increases.

 

  1. Why does the professor think that it is inappropriate for certain wavelengths of light to be named “far-red”?
  • A. Far-red wavelengths appear identical to red wavelengths to the human eye.
  • B. Far-red wavelengths have the same effects on plants as red wavelengths do.
  • C. Far-red wavelengths travel shorter distances than red wavelengths do.
  • D. Far-red wavelengths are not perceived as red by the human eye.

 

  1. What points does the professor make when she discusses the red light and far-red light that reaches plants?
  • A. All of the far-red light that reaches plants is used for photosynthesis.
  • B. Plants flower more rapidly in response to far-red light than to red light.
  • C. Plants absorb more of the red light that reaches them than of the far-red light.
  • D. Red-light is absorbed more slowly by plants than far-red light is.

 

  1. According to the professor, how does a plant typically react when it senses a high ratio of far-red light to red light?
  • A. It slows down its growth.
  • B. It begins photosynthesis.
  • C. It produces more photoreceptors.
  • D. It starts to release it seeds.

 

  1. In the Pampas experiment, what was the function of LEDs?
  • A. To simulate photosynthesis.
  • B. To simulate red light.
  • C. To add to the intensity of the sunlight.
  • D. To provide additional far-red light.


答案:
C B D C A B

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