How do plants obtain energy?

Question

How do plants obtain energy?

Answer 1

I can't add anything sensible so I'll go for the other option, which is to say they eat 'Earth' bars. These are like 'Mars' bars, but are green and full of the goodness of earth.

Answer 2

Sunlight, watering, and nutrients from the soil  feed the plants.

Answer 3

Ever hear of photosynthesis?

Answer 4

By combining Nitrogen, water, carbon dioxide, with sunlight.  The sunlight gives energy to the reaction that turns water and carbon dioxide into complex hydrocarbon chains utilizing a nitrogen intermediate cycle in the conversion that is not yet fully mapped by plant biologists.