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

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Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and remain floating
Burst after reaching some height
Reach a particular height and start coming down

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