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Breathing on a cold surface such as piece of glass causes wate
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Easy
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Solving time: 2 mins

Breathing on a cold surface such as piece of glass causes water droplets to appear on the surface. This proves the presence of

A
in air

B
Moisture in expired air

C
in air

D
All

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By this experiment we can demonstrate that water is lost during breathing in the form of water vapour which condenses on cold surfaces to form water droplets.
Hence the correct option is B.
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Question Text
Breathing on a cold surface such as piece of glass causes water droplets to appear on the surface. This proves the presence of
TopicBreathing and Exchange of Gases
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes118