In an experiment the dependent variable is what you are testing. In this case you are testing if height is affected by the amount of sunlight. It is called dependent because the result would be dependent on the controlled or independent variable.
The independent variable on the other hand, is the variable that is controlled, or manipulated to see changes on what is being tested (dependent variable).
For example, if the red cone is missing you will be unable to see colors containing red as clearly. There are several different types of color blindness. Dichromatism is when one of the cones is missing.
