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Use the following experiment to answer questions 7-10.

An experiment was conducted to measure the influence of different quantities of fertilizer on plant growth. The experiment used 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
\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
No 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?



Answer :

GinnyAnswer
Certainly! Let's break down and analyze the given experiment step by step to determine the independent and dependent variables.

### Problem Overview:
You are conducting an experiment to measure the influence of different quantities of fertilizer on plant growth. You have several pots containing the same type of potting soil and the same type of plant, placed in a well-lit room and watered equally every day. The observations are recorded over a number of days.

### Key Terms:
- Independent Variable: This is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.
- Dependent Variable: This is the variable being tested and measured in a scientific experiment.

### Steps to Identify Variables:

1. Identify the Independent Variable:
- The independent variable is what you change in the experiment to observe its effect.
- In this experiment, you are changing the quantity of fertilizer given to the plants.

Hence, the independent variable is the quantity of fertilizer.

2. Identify the Dependent Variable:
- The dependent variable is what you measure in the experiment.
- In this experiment, you are measuring the growth of the plants over a period of time.

Hence, the dependent variable is the plant growth.

### Answer:

1. Independent Variable:
The independent variable of the above experiment is the quantity of fertilizer.

2. Dependent Variable:
The dependent variable of the above experiment is the plant growth.

In conclusion, by carefully analyzing what is being manipulated and what is being measured, we determine that the quantity of fertilizer is the independent variable and the plant growth is the dependent variable in this experiment.

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