Answer:
Dependent variable: Plant growth
Independent variable: Water
Step-by-step explanation:
The Independent variable in an experiment is defined as the variable which can be changed or controlled to measure its effect on the dependent variable and change in dependent variable depends on the independent variable.
In the given example quantity of water is an independent variable and plant growth is a dependent variable because quantity of water can be controlled that influences plant growth.
Hence, the correct answer is:
Dependent variable: Plant growth
Independent variable: Water