Physics
Plants are dried up in winter due to frost because

Evaporation does not take place
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

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Physics
The bats can fly in the dark because

They generate ultrasonic sound waves
They can see the objects in darkness
They generate flashes of light
They have weak legs and are likely to be attacked by predators

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