The two systems in plants that are interacting when sugars are delivered to different parts and when plants respond to light would be transport and response.
Synthesized foods in the form of carbohydrates are transported from sources to sinks in plants through the phloem. This form parts of the material's transportation system in plants generally.
The transported foods are used to generate ATP during respiration. ATP is spent when plants respond to external stimuli such as water, light, objects, etc. Response to external stimuli in plants is known as tropism.
More on tropisms in plants can be found here: https://brainly.com/question/22044063