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Use the following experiment to answer questions 7-10.

If one were to measure the influence of different quantities of fertilizer on plant growth, the experiment would involve four pots with the same type of potting soil and the same type of plant. Each plant was placed in a well-lit room and watered equally every day.

\begin{tabular}{l|l|l|l|l|l|l|l}
\hline
\begin{tabular}{l}
Amount of \\
fertilizer
\end{tabular} & Type of soil & \begin{tabular}{l}
Day 1 \\
growth [tex]$(cm)$[/tex]
\end{tabular} & \begin{tabular}{l}
Day 2 \\
growth [tex]$(cm)$[/tex]
\end{tabular} & \begin{tabular}{l}
Day 3 \\
growth [tex]$(cm)$[/tex]
\end{tabular} & \begin{tabular}{l}
Day 4 \\
growth [tex]$(cm)$[/tex]
\end{tabular} & \begin{tabular}{l}
Day 5 \\
growth [tex]$(cm)$[/tex]
\end{tabular} & \begin{tabular}{l}
Total \\
growth [tex]$(cm)$[/tex]
\end{tabular} \\
\hline
1 tsp & Potting soil & 1 & 1 & 1 & 2 & 2 & 7 \\
\hline
2 tsp & Potting soil & 1 & 2 & 2 & 3 & 2 & 10 \\
\hline
3 tsp & Potting soil & 1 & 2 & 3 & 3 & 4 & 13 \\
\hline
4 tsp & Potting soil & 2 & 2 & 3 & 4 & 4 & 15 \\
\hline
0 fertilizer & Potting soil & 0 & 1 & 1 & 1 & 1 & 4 \\
\hline
\end{tabular}

11. What is the independent variable of the above experiment?

12. What is the dependent variable of the above experiment?

13. What is the control group of the above experiment?



Answer :

GinnyAnswer
Let's analyze the given experiment to answer questions 11, 12, and 13 step by step.

Question 11: What is the independent variable of the above experiment?

To identify the independent variable, we need to understand that this is the variable that is manipulated or changed by the researcher to observe its effects on the dependent variable. In this experiment, different quantities of fertilizer are applied to the plants to observe their growth.

Answer:
The independent variable is the amount of fertilizer.

Question 12: What is the dependent variable of the above experiment?

The dependent variable is the variable that is measured or observed to see the effect of the changes in the independent variable. In this experiment, plant growth is measured to see how it is influenced by the different amounts of fertilizer.

Answer:
The dependent variable is plant growth.

Question 13: What is the control group of the above experiment?

A control group in an experiment is a group that does not receive the treatment and is used as a benchmark to measure how the other tested subjects compare. In this case, the control group is the group that receives no fertilizer so we can compare its growth to the plants that do receive fertilizer.

Answer:
The control group is the group with no fertilizer.

By identifying the independent variable (amount of fertilizer), the dependent variable (plant growth), and the control group (no fertilizer), we have comprehensively understood the structure of this experiment and what each question pertains to.

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