To test how fertilizer affects tomato plants, a farmer divided a field of young tomato plants into 10 plots of equal size. the farmer then put fertilizer on half of the plots and no fertilizer on the other half of the plots. which factor is being tested in this experiment? a. amount of fertilizer b. kind of plants c. age of plants d. brand of fertilizer

Option (A)

Explanation:

In order to conduct an experiment, there are variables (parameters) that are dependent on the experiment. These variables can be either dependent or independent.

Dependent variables are those that cannot be changed throughout the experiment and are dependent on the independent variables.

On the other hand, the independent variables are those whose changes can have an effect on the experiment. These are the parameters that control the experiment.

In the above-given experiment, the amount of fertilizer is a factor that can be tested, as the amount of fertilizer is determined that is required for the entire crop field, containing tomato. It means that the amount of fertilizers needed to put on half of the plot will be again required to put on the remaining half of it.

Hence, the correct answer is option (A).

thermophiles, notice the prefix thermo.