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
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust will not get melted easily.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.

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