Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 4°C
Density of the substance to the density of water at 0°C

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Physics
Plants are dried up in winter due to frost because

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

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