Physics
In a optical fibre cable, the signal is propagated along the

Surface and cladding
Cladding
Inner Core
Both core and cladding

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Physics
Plants are dried up in winter due to frost because

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

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