The growth of the tomato plant is a dependent variable.
What is a dependent variable?
A dependent variable is a variable whose value depends on other parameters and which is experimentally tested.
In this case, the effect of fertilizer on the growth of the tomato plant is tested. The plants are grown under the same amount of soil, but they have different watering solutions and different amounts of varying fertilizers. This will ultimately affect the growth of the tomato plant. Plants with a good watering system and good fertilizers will grow better as compared to those who will not get a good watering system and fertilizers.
Hence, the growth of the tomato plant is dependent on all other variables.
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