Biology Biomolecules NUMS 2022
PMDC Verified Question 73 of 142
Due to its high heat of vaporization, water plays important role in living organisms as:
A
Thermal shock resistant
B
Being and excellent solvent
C
Membrane stabilizer
D
Cooling agent
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Cooling agent
Concept:

Heat of vaporization is the energy required to convert a liquid to a gas.

Solution:

  • Because water requires a massive influx of heat energy to break its hydrogen bonds and vaporize, evaporation removes substantial heat from the surface it leaves behind.


  • This gives animals an efficient way to release excess body heat in hot environments (e.g., sweating or panting), strictly acting as a cooling agent.


Why other options are incorrect:

  • Thermal shock resistant: This is related to water's High Specific Heat Capacity, which prevents rapid temperature fluctuations, not vaporization.


  • Solvent / Membrane stabilizer: Governed by polarity and hydrophobic exclusion, not phase changes.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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