Physics
Plants are dried up in winter due to frost because

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

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Physics
In a conductor

The forbidden energy gap is very narrow
The valence band and the conduction band overlap each other
The forbidden energy gap is very wide
There is no conduction band

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