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Plants obtain energy from the Sun. Through a process of photosynthesis the plants eventually produce starch.
This is detailed and explained in the diagram below. The process of photosynthesis occurs in the green pigment
in the leaves. The green pigment is called chlorophyll and is stored in special cell organelles called chloroplasts.

Sunlight + Carbon Dioxide + Water —> Starch (Food) + Oxygen (Waste)


Food and Energy

Both are needed for living and growing in plants and animals.
The energy stored in food molecules can only be used when the chemical bonds holding the atoms together
are broken apart to release the energy.
Respiration occurs in cells of both plants and animals. The general reaction is as follows:
Sugar/Carbohydrate Molecule   —->   Carbon Dioxide (CO2) + Water (H2O) + energy released