Water,minerals nutrients, organic nutrients all do the same work which they do in our body.that is mainly growth.water also used in photosynthesis or like processes.
These are essential substances for a plant.in the absent of these the plant will not grow/survive.
Hormones help in controlling various process like growth,flowering,fruit ripening,..etc.
In the absence of hormones the various process related to plant will not work well.
The plant cannot survive in the absence of these things.which are vital(most important) substances for a plant.
Hope you understand. If you have any other doubt put a new question