Photosynthesis and Plant Growth
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Questions and Answers

What is responsible for plant growth and reproduction?

  • Shading of the greenhouse
  • Diminished light intensity
  • Chloroplast injury
  • Carbohydrates formed from light energy, carbon dioxide, and water (correct)
  • How does photosynthesis slow down if light intensity is diminished?

  • Carbohydrate production decreases (correct)
  • Foliage turn deeper green
  • UV light exposure increases
  • Chloroplasts get injured
  • What is the unit used to measure light intensity?

  • Kelvin
  • Lux (correct)
  • Joule
  • Watt
  • Which wavelengths of light are readily utilized in photosynthesis?

    <p>400-700nm</p> Signup and view all the answers

    Why is UV light harmful to plants?

    <p>It is available in shorter wavelengths</p> Signup and view all the answers

    How does excessive light intensity affect plant growth?

    <p>Slows down growth due to chloroplast injury</p> Signup and view all the answers

    What happens to enzyme activity at temperatures above the optimum range for plant growth?

    <p>Enzymes become inactive</p> Signup and view all the answers

    Why is ventilation important in maintaining relative humidity levels in greenhouses?

    <p>To maintain desirable humidity levels</p> Signup and view all the answers

    What effect does temperature have on enzyme-controlled reactions in plants?

    <p>Enzyme reactions speed up with increasing temperature</p> Signup and view all the answers

    Why is it crucial to maintain a specific temperature range in greenhouses for plant growth?

    <p>To maintain enzyme activity</p> Signup and view all the answers

    How does the moisture added by evapotranspiration impact relative humidity in greenhouses?

    <p>Increases relative humidity</p> Signup and view all the answers

    Which type of light is stated to be not involved in the plant process according to the text?

    <p>Infrared light</p> Signup and view all the answers

    What is the function of a polyhouse in agriculture?

    <p>Control temperature and humidity for plant growth</p> Signup and view all the answers

    How does the greenhouse effect contribute to global warming?

    <p>By trapping reflected radiation from the Earth's surface</p> Signup and view all the answers

    What happens to shorter wave radiation that enters a greenhouse during the daytime?

    <p>It gets reflected as long wave radiation and is trapped inside</p> Signup and view all the answers

    How does the covering material of a greenhouse affect radiation?

    <p>Transparent to shorter wave radiation and opaque to longer wave radiation</p> Signup and view all the answers

    What is the phenomenon known as when the blanket of carbon dioxide in the atmosphere leads to an increase in ambient temperature?

    <p>Greenhouse effect</p> Signup and view all the answers

    How does the increase in atmospheric temperature due to the greenhouse effect impact plant growth?

    <p>Promotes plant growth by providing optimal conditions</p> Signup and view all the answers

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