Plant Injury and Sensitivity to Air Pollutants Quiz
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Questions and Answers

How does the sensitivity of plants to air pollutants typically change as relative humidity increases?

  • It increases (correct)
  • It fluctuates
  • It remains constant
  • It decreases
  • What did MacLean et al. observe about gladiolus plants and fluoride sensitivity with changing relative humidity?

  • No correlation between fluoride sensitivity and relative humidity
  • Fluoride sensitivity was only observed at low humidity levels
  • Fluoride sensitivity increased with increasing relative humidity (correct)
  • Fluoride sensitivity decreased with increasing relative humidity
  • Under what light intensity range did sensitivity of pinto bean and tobacco to ozone exposure increase?

  • 3000-4000 fc
  • 900-4000 fc (correct)
  • 1000-1500 fc
  • 500-800 fc
  • At what light intensity level does full stomatal opening occur in plants?

    <p>1000 fc</p> Signup and view all the answers

    What is the general response of plants when exposed to pollutants in the dark?

    <p>They do not react to pollutants</p> Signup and view all the answers

    Why are living organisms seldom exposed to a single pollutant according to the text?

    <p>Living organisms are usually exposed to combinations of pollutants</p> Signup and view all the answers

    How do contaminants cause harm among both plants and animals?

    <p>By inhibiting their ability to thrive</p> Signup and view all the answers

    What term is used in human medicine to describe infants or young children who do not gain weight or develop as expected?

    <p>Failure to thrive</p> Signup and view all the answers

    What is the main impact of contaminant exposure on individual organisms?

    <p>Inhibiting their ability to thrive</p> Signup and view all the answers

    Which term is used to describe the alteration of hormone synthesis or action by contaminants?

    <p>Endocrine disruption (ED)</p> Signup and view all the answers

    What is a generalized way that contaminants cause harm among both plants and animals?

    <p>Inhibiting their ability to thrive</p> Signup and view all the answers

    How do investigators determine the impact of contaminants on animals that cannot communicate their feelings?

    <p>By observing signs rather than symptoms</p> Signup and view all the answers

    What has been shown to decrease the toxic effects of O3, NO2, and certain hydrocarbons in experimental mice?

    <p>Oil mists dissolving the gas and holding it in solution</p> Signup and view all the answers

    What is the most widely studied factor affecting plant response to air pollutants?

    <p>Genetic variation</p> Signup and view all the answers

    In plants, what is a function of genetic variability that influences their response to air pollutants?

    <p>Morphological, physiological, and biochemical characteristics</p> Signup and view all the answers

    How was the sensitivity to O3 of two onion cultivars shown to be controlled?

    <p>By a single gene pair</p> Signup and view all the answers

    Which plant species has long been recognized to be extremely sensitive to fluoride?

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

    According to Engle and Gableman (1966), what happened to the stomata of the resistant onion cultivar after exposure to O3?

    <p>Closed with no appreciable injury</p> Signup and view all the answers

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