Physics
What is the principle of a ''Life Jacket"?

It increases the volume of the person to keep him afloat
It provides oxygen to a drowning person
The person can sit on it like a raft
It decreases the volume of the person to keep him afloat

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Physics
Plants are dried up in winter due to frost because

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

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