How many tropic levels are in the flowing food chain?

Four tropic levels.

Explanation:

Generally, there is a maximum of four trophic levels. Many consumers feed at more than one trophic level. Umm...for example, humans are primary consumers when they eat plants such as vegetables.

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.