If water has a high latent heat of vaporization, how could this property of water be helpful to plants and animals?
Correct answer: B. With the release of small amount of water vapours, a great amount of heat loss can take place.
- A. With the release of large amount of water, a small amount of heat loss can take place.
- B. With the release of small amount of water vapours, a great amount of heat loss can take place.
- C. It will keep their temperature very high.
- D. No cooling effect, with the release of even a large amount of water vapours.
Explanation
As per the formula Q=mL, since water has a high latent heat of vaporization (L), for a small mass or amount of water (m), a large amount of energy (Q) will be released which results in a large amount of heat loss, enabling the organism to remain cool via sweating (animals) or transpiration (plants). Option A describes this effect but in reverse, option C states the opposite effect as this process prevents their temperature from becoming too high, and option D is false as a cooling effect does indeed occur.
This question appeared on the UHS MDCAT 2019 paper, which you can sit online with every answer explained.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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