Plants primarily get the following elements directly from water:
- Hydrogen
While plants do release oxygen as a byproduct of photosynthesis, they do not obtain it directly from water in a usable form for their metabolic processes. Nitrogen and carbon are not obtained directly from water; nitrogen is typically absorbed from the soil in the form of nitrates or ammonium, and carbon is absorbed from the atmosphere as carbon dioxide.
So, the correct response is:
- Hydrogen