[Campbell Biology P.842] What is guttation, and how does the text differentiate it from dew? | Practice Question

What is guttation, and how does the text differentiate it from dew?

  • A: Guttation is the condensation of atmospheric moisture on leaves, while dew is water exuded from plant pores.
  • B: Guttation is the exudation of water droplets from leaves due to root pressure, while dew is condensed atmospheric moisture.
  • C: Both guttation and dew are caused by high rates of transpiration.
  • D: Guttation occurs only during the day, whereas dew occurs at night.

Explanation

The text states: 'Water flows in from the root cortex, generating root pressure, a push of xylem sap. The root pressure sometimes causes more water to enter the leaves than is transpired, resulting in guttation, the exudation of water droplets that can be seen in the morning on the tips or edges of some plant leaves Figure 36.10 . Guttation fluid should not be confused with dew, which is condensed atmospheric moisture.' This clearly defines guttation as exudation due to root pressure and differentiates it from dew, which is atmospheric condensation.