Question

extension: write your own scenario. identify the independent and dependent variables.

Explanation:

Define variables

Using the Independent Variable and Dependent Variable knowledge points, we define the core components of an experiment. The independent variable is the factor manipulated by the researcher. The dependent variable is the factor measured to observe the effect of that manipulation.

Create a scenario

Using the Experimental Design knowledge point, we construct a clear, testable scenario. Let's design a simple experiment: testing how the amount of daily sunlight affects the height of a tomato plant over two weeks.

Identify the independent variable

In our scenario, the factor we intentionally change is the amount of daily sunlight each plant receives. Therefore, the independent variable is the hours of daily sunlight.

Identify the dependent variable

The factor we measure to see how it responds to the sunlight is the growth of the plant. Therefore, the dependent variable is the height of the tomato plant (measured in centimeters).

Answer:

Scenario:
An experiment is conducted to test how the amount of daily sunlight affects the growth of tomato plants. Three identical tomato plants are placed in the same soil and given the same amount of water daily, but each is exposed to a different amount of sunlight: 4 hours, 8 hours, and 12 hours per day. After two weeks, the height of each plant is measured.

• Independent Variable: The amount of daily sunlight (measured in hours).
• Dependent Variable: The height of the tomato plant (measured in centimeters).