Answer:
Visible light
Step-by-step explanation:
Electromagnetic waves are formed from a combination of electrical and magnetic effects. Depending on the wavelengths, there are various waves in the EM waves. One of these waves ranging from wavelength 400-700nm is called VISIBLE LIGHT.
The chlorophyll pigments of plants, which enable them perform the process of photosynthesis, are only able to absorb the visible light of EM waves i.e. light ranging from blue to far red. Hence, VISIBLE LIGHT is the EM wave that is responsible for food production of plants through photosynthesis.