Physics
Ice is packed in saw dust because

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

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Physics
Plants are dried up in winter due to frost because

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

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