Limiting Factors in Photosynthesis Graphs
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Questions and Answers

What is the effect of increasing temperature on the rate of photosynthesis?

  • The rate of photosynthesis decreases as temperature increases.
  • The rate of photosynthesis increases up to an optimal temperature, then decreases as enzymes denature. (correct)
  • The rate of photosynthesis continually increases with temperature.
  • Temperature has no effect on the rate of photosynthesis.

    • Which of the following is NOT a factor affecting the rate of photosynthesis?

  • Carbon dioxide concentration
  • Light intensity
  • Water concentration (correct)
  • Temperature

    • What is the role of light in photosynthesis?

  • Light is a product of the photosynthetic reaction.
  • Light provides energy for the photosynthetic reaction. (correct)
  • Light is a reactant in the photosynthetic equation.
  • Light has no role in photosynthesis.

    • If the concentration of carbon dioxide is increased, what effect will it have on the rate of photosynthesis?

    <p>The rate of photosynthesis will increase.</p> Signup and view all the answers

    Which of the following statements about the limiting factors in photosynthesis is correct?

    <p>If one factor is limiting, increasing other factors will not increase the rate of photosynthesis.</p> Signup and view all the answers

    At low light intensities, what happens to the rate of photosynthesis as light intensity increases?

    <p>The rate of photosynthesis increases.</p> Signup and view all the answers

    Which of the following is the balanced chemical equation for photosynthesis?

    <p>$CO_2 + H_2O \rightarrow C_6H_{12}O_6 + O_2$</p> Signup and view all the answers

    Which of the following statements about the effect of temperature on photosynthesis is correct?

    <p>There is an optimal temperature range for photosynthesis, beyond which the rate decreases.</p> Signup and view all the answers

    Which of the following statements about the role of carbon dioxide in photosynthesis is correct?

    <p>Carbon dioxide is a reactant in photosynthesis.</p> Signup and view all the answers

    Which of the following factors would be considered a limiting factor in photosynthesis?

    <p>All of the above</p> Signup and view all the answers

    Study Notes

    Rate of Photosynthesis

    • The rate of photosynthesis will not increase beyond a certain point, even if other factors such as temperature or carbon dioxide concentration increase.
    • This is shown on a graph as the curve levelling off.
    • A graph with one line represents one limiting factor, with the factor on the horizontal axis and rate of photosynthesis on the vertical axis.

    Limiting Factors

    • A graph with two lines represents two limiting factors in two experiments, with the factor on the horizontal axis and rate of photosynthesis on the vertical axis.
    • The limiting factor is the factor that limits the rate of photosynthesis, such as light intensity or temperature.
    • If light intensity is the limiting factor, increasing it can increase the rate of photosynthesis.

    Factors Affecting Photosynthesis

    • Temperature: an increase in temperature increases the rate of photosynthesis, but only up to a certain point, after which the enzymes denature and the rate decreases.
    • Light Intensity: higher light intensity increases the rate of photosynthesis.
    • Carbon Dioxide Concentration: increasing the concentration of carbon dioxide increases the rate of photosynthesis.

    Chlorophyll

    • Chlorophyll is a pigment in the leaf that converts light energy to food for the plant.
    • Reducing chlorophyll levels (e.g. through magnesium deficiency) decreases the rate of photosynthesis.

    Measuring Photosynthesis

    • The rate of photosynthesis can be measured by observing oxygen production.
    • This can be done by placing pondweed in a test tube, sealing it with a bung, and attaching a capillary tube to a syringe.
    • The distance the bubble has moved is measured using a ruler to calculate the volume of oxygen produced.

    Controlling Variables

    • It is important to control all factors that may affect photosynthesis, except the independent variable being observed, to ensure a valid experiment.
    • Any of the factors above may become a limiting factor.

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    Description

    Learn about how the rate of photosynthesis will not increase further despite changes in other factors, as seen in graphs with leveling off curves. Understand the concept of limiting factors in photosynthesis experiments with one or two lines on a graph.

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