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Question 53

A well-lit plant in bright sunshine is watched for an hour. Which statements about its gas exchange over that hour are true? Select all that apply.

  1. It has stopped respiring while the light is bright
  2. It gives out no oxygen at all until the light fades
  3. Overall it takes in more carbon dioxide than it gives outCorrect answer
  4. Overall it gives out more oxygen than it takes inCorrect answer

Explanation

In bright light photosynthesis runs much faster than respiration, so the two do not cancel out and the plant ends the hour as a net consumer of carbon dioxide and a net supplier of oxygen. Both processes are running throughout, and describing the plant as having stopped respiring mistakes the balance between two processes for the absence of one.

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Question 53: A well-lit plant in bright sunshine is watched for an hour.… · Plants and Photosynthesis · Questena