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
There is mechanical loss of tissues and drought condition prevails
Evaporation does not take place

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in both is same but the rate of doing work is less in rolling.
Work done in lifting the stone is equal to rolling it.
Work done in rolling a stone is less than in lifting it.
Work done in rolling is more than in lifting.

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Physics
The law of conservation of energy states that

Energy can either be created nor destroyed
Energy can neither be created nor destroyed
Energy can either be created or destroyed
Energy can neither be created or destroyed

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