Physics
Plants are dried up in winter due to frost because

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

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Physics
A dynamo is a device which

Creates electrical energy
Creates mechanical energy
Converts electrical energy into mechanical energy
Converts mechanical energy into electrical energy

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Physics
Solids have definite shapes.This is because

The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are less
The forces of adhesion are large

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