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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The property of water that allows the cooling of leaves during transpiration is fundamentally based on the

A. Release of heat during the condensation of water vapor
B. Absorption of heat during the conversion of liquid water to water vapor
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C. High thermal conductivity of the leaf surface
D. Reflection of solar radiation by water droplets

📝 Explanation

Transpiration is the evaporation of water from mesophyll cell walls. This phase change from liquid to gas is endothermic, absorbing energy (latent heat of vaporization). This energy is taken from the leaf tissue, effectively cooling it and preventing heat damage from solar radiation.

📖 Additional Information

  • Release of heat during the condensation of water vapor
  • Absorption of heat during the conversion of liquid water to water vapor
  • High thermal conductivity of the leaf surface
  • Reflection of solar radiation by water droplets

Transpiration is the evaporation of water from mesophyll cell walls. This phase change from liquid to gas is endothermic, absorbing energy (latent heat of vaporization). This energy is taken from the leaf tissue, effectively cooling it and preventing heat damage from solar radiation.

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