Ch 4: Environmental factors affecting the rate of photosynthesis
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Questions and Answers

What are the primary environmental factors influencing the rate of photosynthesis?

  • Humidity, wind speed, soil pH
  • Soil type, water salinity, air pressure
  • Intensity of light, concentration of carbon dioxide (CO2), temperature (correct)
  • Light intensity, carbon monoxide concentration, humidity

    • How does the rate of photosynthesis change with low light intensity?

  • Stops
  • Decreases (correct)
  • Remains constant
  • Increases

    • What is the relationship between light intensity and photosynthesis?

  • Linear
  • Sigmoidal (correct)
  • Quadratic
  • Exponential

    • What happens to the rate of photosynthesis beyond the optimal light intensity threshold?

    <p>Does not increase proportionally</p> Signup and view all the answers

    Which factor limits the rate of photosynthesis at low light intensities?

    <p>CO2 concentration</p> Signup and view all the answers

    Why is understanding environmental factors important for photosynthesis?

    <p>To elucidate the dynamics of photosynthetic activity</p> Signup and view all the answers

    At what point does the rate of photosynthesis achieve maximal activity with increasing light intensity?

    <p>Optimal point</p> Signup and view all the answers

    What factor limits photosynthetic activity beyond the optimal light intensity threshold?

    <p>CO2 availability</p> Signup and view all the answers

    How do further increases in light intensity beyond the optimal threshold affect photosynthetic rates?

    <p>Decrease proportionally</p> Signup and view all the answers

    What does a sigmoidal curve indicate in the relationship between light intensity and photosynthesis?

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

    What can excessive light intensity lead to in photosynthesis?

    <p>Photoinhibition and damage to photosynthetic apparatus</p> Signup and view all the answers

    How do photosynthetic rates respond to carbon dioxide concentration?

    <p>Exhibit a positive correlation up to a threshold level</p> Signup and view all the answers

    What happens to photosynthesis at CO2 concentrations beyond the optimum level?

    <p>Stomatal closure and reduced efficiency</p> Signup and view all the answers

    How does temperature influence photosynthetic rates?

    <p>Bell-shaped response with an optimal point</p> Signup and view all the answers

    What benefit does greenhouse cultivation provide for crop growth?

    <p>Enhanced photosynthetic rates</p> Signup and view all the answers

    Why is excessive light intensity detrimental to photosynthetic efficiency?

    <p>Leads to photoinhibition and damage</p> Signup and view all the answers

    What factor constrains photosynthetic activity at low CO2 concentrations?

    <p>Sluggish enzyme kinetics</p> Signup and view all the answers

    How does excessive CO2 concentration impact photosynthetic efficiency?

    <p>Causes stomatal closure</p> Signup and view all the answers

    What occurs beyond the temperature optimum for photosynthesis?

    <p>Enzyme denaturation and reduced function</p> Signup and view all the answers

    How does greenhouse cultivation impact environmental concerns?

    <p>Accelerates global warming due to CO2 emissions</p> Signup and view all the answers

    What is the principal determinant of photosynthetic rates?

    <p>Availability of radiant energy</p> Signup and view all the answers

    What pattern does the relationship between light intensity and photosynthesis follow?

    <p>Sigmoidal curve</p> Signup and view all the answers

    At low light intensities, what limits the rate of photosynthesis?

    <p>Availability of radiant energy</p> Signup and view all the answers

    What becomes limiting to photosynthetic rates beyond the optimal light intensity point?

    <p>CO2 availability</p> Signup and view all the answers

    What factor does not elicit proportional increases in photosynthetic rates with further increases in light intensity?

    <p>Light intensity</p> Signup and view all the answers

    In the process of photosynthesis, what does a sigmoidal curve represent?

    <p>A threshold beyond which further increases in light intensity do not significantly impact photosynthetic rates</p> Signup and view all the answers

    Which environmental factor exerts profound influences on the rate of photosynthesis?

    <p>Intensity of light</p> Signup and view all the answers

    What happens when light intensity increases in relation to photosynthesis?

    <p>Maximal rate of photosynthetic activity is achieved</p> Signup and view all the answers

    What primarily limits the rate of photosynthesis beyond an optimal light intensity?

    <p>CO2 availability</p> Signup and view all the answers

    What is the significance of understanding environmental factors for photosynthesis?

    <p>Crucial for elucidating the dynamics of photosynthetic activity</p> Signup and view all the answers

    How does excessive light intensity impact photosynthetic efficiency?

    <p>Causes stomatal closure due to limited gas exchange</p> Signup and view all the answers

    At low concentrations, what constrains photosynthetic activity due to the availability of carbon?

    <p>Suboptimal carbon assimilation rates</p> Signup and view all the answers

    What effect does excessive CO2 concentration have on photosynthetic efficiency?

    <p>Induces stomatal closure and water stress</p> Signup and view all the answers

    What is the effect of rising temperatures beyond the optimal point on photosynthesis?

    <p>Impaired photosynthetic function</p> Signup and view all the answers

    What factor contributes to the intensification of the greenhouse effect in greenhouse cultivation?

    <p>Enriched CO2 emissions</p> Signup and view all the answers

    How does the rate of photosynthesis respond to CO2 concentration increases beyond the optimum level?

    <p>Yields diminishing returns in photosynthetic rates</p> Signup and view all the answers

    Which environmental factor has a bell-shaped response to photosynthesis rates with rising temperatures?

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

    How does greenhouse cultivation impact global warming and climate change concerns?

    <p>Exacerbates CO2 emissions</p> Signup and view all the answers

    What is the primary impact of exceeding the threshold temperature for photosynthesis?

    <p>Impaired photosynthetic function</p> Signup and view all the answers

    How does CO2 concentration influence photosynthetic rates at low concentrations?

    <p>Constrained photosynthetic activity</p> Signup and view all the answers

    What characteristic of the relationship between light intensity and photosynthesis can be described as sigmoidal?

    <p>Reaching a plateau</p> Signup and view all the answers

    At low light intensities, why is the rate of photosynthesis limited?

    <p>Lack of CO2</p> Signup and view all the answers

    Beyond the optimal threshold of light intensity, what factor becomes limiting to photosynthetic rates?

    <p>CO2 availability</p> Signup and view all the answers

    In what shape does the relationship between light intensity and photosynthesis rates follow?

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

    What environmental factor can profoundly influence the dynamics of photosynthetic activity?

    <p>Light intensity</p> Signup and view all the answers

    At an optimal point of light intensity, what happens to the rate of photosynthesis?

    <p>Reaches a maximum</p> Signup and view all the answers

    What effect does excessive light intensity have on photosynthetic rates beyond the threshold?

    <p>Inhibits photosynthesis</p> Signup and view all the answers

    How does carbon dioxide concentration influence photosynthetic rates at high levels?

    <p>Limits photosynthesis</p> Signup and view all the answers

    What becomes the principal determinant of photosynthetic rates with increasing light intensity?

    <p>Light intensity</p> Signup and view all the answers

    How do variations in light intensity impact the efficiency of light-dependent reactions?

    <p>Increase efficiency</p> Signup and view all the answers

    What is the primary substrate for carbon fixation during the Calvin cycle?

    <p>Carbon Dioxide</p> Signup and view all the answers

    What does excessive light intensity lead to in terms of photosynthetic efficiency?

    <p>Minimizes efficiency</p> Signup and view all the answers

    What occurs when photosynthesis reaches an optimum level of CO2 concentration?

    <p>Stomatal closure happens</p> Signup and view all the answers

    Why does excessive temperature adversely affect photosynthetic function?

    <p>Leads to enzyme denaturation</p> Signup and view all the answers

    In greenhouse cultivation, what can lead to accelerated growth and enhanced yields?

    <p>Supplemental lighting</p> Signup and view all the answers

    What happens to photosynthetic efficiency when exceeding the threshold CO2 concentration?

    <p>Efficiency decreases</p> Signup and view all the answers

    At low temperatures, what limits photosynthetic activity?

    <p>Enzymatic activity</p> Signup and view all the answers

    Beyond the optimal temperature for photosynthesis, what occurs to enzymatic reactions?

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

    What can help optimize photosynthetic rates and crop growth in greenhouse cultivation?

    <p>Climate control technologies</p> Signup and view all the answers

    What happens to photosynthetic rates with rising temperatures up to the optimal point?

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

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