Physics
Plants are dried up in winter due to frost because

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

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Physics
Pressure Cooker cooks faster because

The material of the cooker is a good conductor
It cooks the food at low pressure
Boiling point decreases with rise of pressure
Higher temperature is attained for cooking

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