Physics
Plants are dried up in winter due to frost because

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

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Physics
Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at low temperature
conduct electricity at high temperatures
offer no resistance to the flow of electricity

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