Water Balance in Plant Cells
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Questions and Answers

What percentage of water taken up by the root is lost as water vapor from the leaf in transpiration?

  • 90%
  • 50%
  • 99%
  • 97% (correct)

    • What is the approximate ratio of water molecules diffused out to CO2 molecules diffused in during photosynthesis?

  • 200:1
  • 500:1
  • 100:1
  • 400:1 (correct)

    • What is the primary property of water molecules that enables them to act as a wide-ranging solvent?

  • Polar structure
  • Ionic structure
  • Electronegativity
  • Hydrogen bonding ability (correct)

    • What is the essential physiological function that requires turgor pressure in plant cells?

    <p>Stomatal movement</p> Signup and view all the answers

    What is the source of electrons that reduce CO2 to carbohydrate level during photosynthesis?

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

    What is the primary function of water in plant cells, apart from its solvent properties?

    <p>Turgor pressure creation</p> Signup and view all the answers

    What is the primary mechanism driving transpiration in plants?

    <p>The absorption of sunlight by the leaves</p> Signup and view all the answers

    What is the main function of the stomata in plant leaves?

    <p>To facilitate photosynthesis</p> Signup and view all the answers

    What is the primary location of water evaporation in plant leaves?

    <p>The mesophyll cells</p> Signup and view all the answers

    What percentage of a plant's water loss occurs through the stomata?

    <p>95%</p> Signup and view all the answers

    What is the role of guard cells in regulating transpiration?

    <p>To balance water conservation with photosynthesis</p> Signup and view all the answers

    What is the primary function of the cuticle in plant leaves?

    <p>To limit water loss through the leaf surface</p> Signup and view all the answers

    Under what conditions is there no further net movement of water in a cell?

    <p>When the water potential of the cell is equal to that of the extracellular environment</p> Signup and view all the answers

    What is the primary function of aquaporins in plant cells?

    <p>To facilitate the transport of water molecules across the plasma membrane</p> Signup and view all the answers

    What happens to a cell when it loses turgor pressure?

    <p>It becomes flaccid</p> Signup and view all the answers

    What determines the direction of water movement across membranes?

    <p>The difference in water potential</p> Signup and view all the answers

    What is the result of turgid cells pushing against each other in nonwoody tissues?

    <p>The tissue becomes stiffened</p> Signup and view all the answers

    What is the purpose of the partially elastic wall in a plant cell?

    <p>To exert turgor pressure and confine the pressurized protoplast</p> Signup and view all the answers

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