Question

in an experiment testing sunlights effect on plant growth, what is the dependent variable? amount of sunlight height of the plant type of soil pot size. why is it important to have a control group? a student tests whether fertilizer increases tomato production. what is the independent variable? fertilizer tomato production constant. a student tests whether fertilizer increases tomato production. what is the dependent variable?

Explanation:

1. In an experiment testing sunlight's effect on plant growth, the height of the plant is the dependent variable as it is expected to change based on the amount of sunlight (the independent variable). Other factors like type of soil and pot size are controlled variables.
2. A control group is important in an experiment to provide a baseline for comparison. It helps to determine if the changes observed in the experimental group are due to the independent variable or other factors. Without a control group, it's hard to say if the results are valid.
3. When testing whether fertilizer increases tomato production, the independent variable is the fertilizer because it is the factor that the experimenter manipulates. Tomato production is the dependent variable as it is the outcome that is being measured and is expected to be affected by the fertilizer.

Answer:

1. Height of the plant
2. To provide a baseline for comparison
3. Fertilizer