Answer:
rate of ripening
Step-by-step explanation:
Every experiment that an experimenter carries out includes a dependent variable and an independent variable.
A dependent variable is a variable in the research which depends on another. It is dependent and its value changes if the independent variable changes.
In the context, a scientist investigating the rate of ripening of tomatoes with relation to the light and its effect on tomatoes. Thus the independent variable here is the intensity of light and the dependent variable is the ripening of the tomatoes.