Physics
Superconductors are those elements

Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures

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Physics
Plants are dried up in winter due to frost because

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

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