Physics
The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with

Pascal's law
Newton's law
Archimedes' principle
Bernoulli's principle

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Physics
Plants are dried up in winter due to frost because

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

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