Physics
Super conductors are substances that

Offer minimum resistance to flow of electric current
Conduct electricity at low temperature
Conduct electricity at high temperature
Offer high resistance to the flow of electric current

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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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