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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Physics
Specific gravity is defined as the ratio of

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

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail

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