During photosynthesis, plants convert radiant energy into chemical energy. The amount of chemical energy produced is less than the amount of energy absorbed by the plant in the form of light. Which best explains what happens to the remaining light energy?

The difference in energy is lost as heat during its conversion

Explanation:

During photosynthesis, approximately  90%  of the energy is lost as heat in the process of conversion. In consequence, only 10% of the sun's energy transforms into chemical bonds

the electromagnetic energy from the sun arrives in the form of visible and invisible light.