Answer:The factor that helps plants produce their own food through photosynthesis is sunlight. Here's why:Photosynthesis: This process is how plants convert light energy from the sun into chemical energy (in the form of sugars) to fuel their growth.Chlorophyll: Plants have a green pigment called chlorophyll that absorbs sunlight, specifically the red and blue wavelengths, and uses this energy to power the chemical reactions of photosynthesis.