Physics
Plants are dried up in winter due to frost because

Respiration does not take place at low temperature
There is mechanical loss of tissues and drought condition prevails
Photosynthesis does not take place at such low temperature
Evaporation does not take place

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Physics
Absolute Zero is defined as

At which liquid Helium boils
At which the volume becomes zero
The temperature at which all molecular motion ceases
At which water boils at 298K

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