Concept:The source of energy for food production in plants is light energy from the sun.
Explanation:Plants make their own food through the process of photosynthesis.
During photosynthesis, green plants use carbon dioxide and water to produce glucose and oxygen.
For this process to happen, the plant must absorb light energy.
This light energy is obtained from sunlight, which is captured by the green pigment chlorophyll.
Chlorophyll only traps the light; it does not provide the energy itself.
Therefore, the actual source of energy required by plants during food production is sunlight.
Photosynthesis is the overall process, not the energy source.
Microorganisms are not involved in providing energy to green plants.
Answer:Sunlight (Option C).