Not quite sure what you mean; a plant needs sunlight and some other environmental conditions to survive, so it is of course dependent on all those conditions. Some planets also depend on insects, for example for pollination.
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the height of a plant is independent because you never have an exact estimate for everything.
the independent of the tomato plant is the leaf and the dependent variable is the root
Whether or not the plant is exposed to sunlight. Independent variables are manipulated by the experimentor, dependent variables react to the change in the independent variable.
The independent variable is the one thing in the experiment that does change. The dependent variable "depends" on the independent variable. For example if you were testing to see how well plants grow in the dark, and you put one plant in a closet and the other by a window. The independent variable would be the amount of sunlight that each plant gets. The dependent variable would be if the plants grew or not because it depends on how much sunlight each plant got.
80 is neither dependent nor independent. It is a number: a variable can be dependent or independent, not a constant.