Physics
The Hooke's law is valid for

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

ANSWER DOWNLOAD EXAMIANS APP

Physics
Plants are dried up in winter due to frost because

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

ANSWER DOWNLOAD EXAMIANS APP