Physics
A water tank appears shallower when it is viewed from top due to

Total internal reflection
Refraction
Rectilinear propagation of light
Reflection

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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
Evaporation does not take place
Respiration does not take place at low temperature

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