Question

Now that you have some background information about the plant or plant community you would like to investigate, think about every variable you can think of that might influence the outcome of the experiment. Easy ones are light, moisture, etc. You can add more detail to this. Light intensity or light duration? Here you are brainstorming.

→ variables (listed):

You can only reasonably investigate one or two variables in a simple experimental design. Therefore, now narrow the scope of your experimental design. Write at least 200 words.

→ Experimental design:

Answer 1

Variables (listed):

•Light (more or less intensity)

•Moisture

•Presence or lack of oxygen

•Presence of a herbicide

•Presence of any compound that could affect the plant

•Temperature

Experimental design

In this case, we will test the influence of light on the plant growth. We will place three plants of the same kind in different places of your home. One plant will be placed in the window were the light intensity is intense, other plant will be placed in your living room where the intense of light is moderate and the last one will be placed inside a box. The experiment will be executed during one week.

Our hypothesis would be: “If light is fundamental for growing, the plant placed in the window will have a longer length of stem than the other two plants”

Dependent variable: Length of the stem. Since the photosynthesis requires light and it is directed associated with the growth of the plant. The length of the stem will be affected by the intensity of light.

Independent variable: The place were is located each plant. This variable is independent because it does not depend on any other variable. In fact, the length of the plant depends on the place of localization.

Controlled variables: In this case, we will watering the plant one time each 2 days during a week and we will allow oxygen to be in contact with each plan.

After a week, we will measure the length of the stem with a rule and we will make some conclusions.