Physics
The Hooke's law is valid for

Only proportional region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire stress strain curve
Entire elastic region of the stress strain curve

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Physics
Plants are dried up in winter due to frost because

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

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