Plants use their roots to get oxygen. Oxygen is dissolved in water, and there's also air pockets in their grow medium to provide a source of oxygen. When you water your plants too often, its roots are sitting in stagnant water which no longer has any oxygen left.
Which point(s) in the water cycle below best illustrate(s) water changing to a gas, and which term(s) could describe it? Is it.. 1; sublimation & evaporation. 2; evaporation only.
It's not as simple as a specific substance always changing directly from solid to gas, and vice versa. It depends on pressure also. For example, water can change directly from gas to solid at low enough pressure.