Main Answer:
The example of a controlled experiment is testing the growth of plants under varying amounts of sunlight exposure.
Step-by-step explanation:
In this experiment, a group of identical plants is selected.
The independent variable is the amount of sunlight each group receives (e.g., 0 hours, 4 hours, 8 hours).
All other factors that can influence plant growth (soil type, water, temperature) are kept constant.
The dependent variable is the growth of the plants, measured by height or number of leaves.
This setup allows researchers to isolate and study the specific impact of sunlight on plant growth.
3. Image:
(Description of a diagram showing three groups of plants, each with a different amount of sunlight, and controlled variables such as soil type and water.)
This controlled experiment design ensures that any differences observed in plant growth can be attributed to the varying levels of sunlight, making it a reliable way to investigate the relationship between sunlight exposure and plant growth.