An experiment showing how a tomato grows is a good experiment to demonstrate the scientific method, according to Science Made Simple. Use the experiment to determine if a tomato plant produces larger tomatoes when the plant is placed in the sun rather than in the shade.
The topic of this experiment is, does the amount of sunlight a tomato plant receives affect the size of the tomatoes it produces, according to Science Made Simple. To run this experiment, get two tomato plants. Place one where it will receive little to no sunlight and place the other in a location that receives plenty of sun.
The first step in the scientific method is the hypothesis. Hypothesize about whether or not sun has a role to play in the size of tomatoes. A hypothesis can be something simple like, "The more sun a tomato plant receives, the larger the tomatoes will be."
The next step is prediction. When making a prediction, come up with a way to demonstrate that the hypothesis is correct. A prediction in this case may be, "By increasing the amount of sunlight one plant receives, the tomatoes that plant produces will be larger compared to the tomatoes the other plant produces."
Next, run the experiment. Place one tomato plant in an area that receives sunlight and another in a darker place. Observe what happens to both plants and give each the same care, without changing the light they receive.
Finally, draw a conclusion. When both plants produce tomatoes, look at them and decide if the hypothesis was correct. Either reject or accept the hypothesis based on the results of the experiment.