Biology Biomolecules MDCAT 2019
PMDC Verified Question 108 of 142
If water has high latent heat of vaporization, how this property of water could be helpful to plants and animals?
A
It will keep their temperature very high
B
With the release of large amount of water vapors, a small amount of heat loss can take place
C
With the release of small amount of water vapors, a great amount of heat loss can take place
D
No cooling effect with the release of even large amount of water vapors
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: With the release of small amount of water vapors, a great amount of heat loss can take place
Concept:

The specific heat of vaporization of water is very high due to extensive hydrogen bonding.

Solution:

  • Water absorbs a massive amount of heat as it changes from a liquid state to a gaseous state.


  • Because of this high energy requirement, the evaporation of just a small amount of water effectively carries away a great amount of heat.


  • For example, the evaporation of only 2 mL out of 1 liter of water lowers the temperature of the remaining 998 mL by a full 1°C. This provides a highly efficient cooling mechanism for organisms (like sweating in animals or transpiration in plants).


Why other options are incorrect:

  • Option B: The relationship is inverted; a small volume of vapor releases a large amount of heat, not vice versa.


  • Options A & D: Contradict the fundamental physical reality that evaporation produces a profound cooling effect.

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