Final answer:
The three interactions that can happen when a photon intercepts vegetation are transmission, reflection, and absorption, leading to processes like photosynthesis.
Step-by-step explanation:
When a photon intercepts vegetation, three possible interactions can occur: transmission, reflection, and absorption. If vegetation is transparent to a specific frequency of light, the photons can be transmitted through the plant tissue. However, if the material is opaque to the light frequency, photons can be reflected off the surface of the vegetation. Lastly, absorption takes place when photons' energy is captured by the plant's molecules, typically leading to processes such as photosynthesis, where absorbed light is converted into chemical energy.