Potometer: Measuring Water Uptake in Plants
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Questions and Answers

What is the main reason for water uptake by a cut shoot in a potometer?

  • Photosynthesis
  • Absorption
  • Respiration
  • Transpiration (correct)
  • Why are potometers notoriously difficult to set up?

  • They require frequent calibration
  • They are sensitive to light exposure
  • Air bubbles can disrupt their functioning (correct)
  • They rely on complex mathematical formulas
  • How can the effect of wind, heat, and humidity on transpiration be measured using a potometer?

  • By increasing the scale of the potometer
  • By changing the type of plant used in the experiment
  • By adjusting the pH of the water in the potometer
  • By altering the surrounding atmospheric conditions (correct)
  • What does measuring how far a bubble moves in a given period of time help determine in a potometer?

    <p>Transpiration rate</p> Signup and view all the answers

    In a potometer setup, why is it important to measure the surface area of both sides of the leaves?

    <p>To compare transpiration rates between plant species</p> Signup and view all the answers

    What could be a useful unit for comparing transpiration rates in different plant species through a potometer?

    <p>Water loss (ml)/cm2/minute</p> Signup and view all the answers

    What is the main factor influencing water potential in plant solutions?

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

    How is water potential denoted in plant physiology?

    <p>ψ (Psi)</p> Signup and view all the answers

    What is the unit of measurement used to express water potential?

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

    In terms of water potential, what value is designated to pure water for convenience of definition?

    <p>0 MPa</p> Signup and view all the answers

    What allows plants to move water to great heights?

    <p>Transpiration pull</p> Signup and view all the answers

    What effect would a decrease in solute concentration have on the water potential of a plant cell?

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

    Which component of water potential is responsible for reducing available potential energy when solutes are added to an aqueous system?

    <p>Solute potential</p> Signup and view all the answers

    In the context of water movement in plants, why is solute potential referred to as osmotic potential?

    <p>Relating to the movement of water across a membrane</p> Signup and view all the answers

    Which of the following statements is true regarding the direction of water movement based on water potentials in plant systems?

    <p>Water moves towards an area with higher solute potential</p> Signup and view all the answers

    What happens to the total water potential when Ψs decreases?

    <p>Total water potential decreases</p> Signup and view all the answers

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