Physics
Stars appears to move from east to west because

The background of the stars moves from west to east
All stars move from east to west
The earth rotates from east to west
The earth rotates from west to east

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Physics
Plants are dried up in winter due to frost because

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

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