Experimental Variables
A scientist changes the amount of water each plant receives.
This is the ______.
Independent (Test) Variable
What was the test (independent) variable in the Brine Shrimp experiment?
This kind of investigation takes place in nature where scientists only observe and collect data.
Investigation
This explains WHY something happens in nature.
Theory
The group that does not receive the test variable.
Control group
In an experiment measuring bean plant height, the height is the ______
Dependent (Outcome) Variable
How did we measure the vitality of the brine shrimp during the experiment?
By counting the number of leg beats in 10 seconds
This type of scientific study includes an independent variable, dependent variable, constants, control group, and experimental group.
Controlled Experiment
This explains WHAT scientists expect to happen in nature.
Law
A 2D or 3D representation used to explain something scientists cannot directly observe.
Model
Temperature, light, and soil are kept the same throughout an experiment. These are called ______.
Controlled Variables (Constants)
Our control group was the brine shrimp placed in water with this pH.
pH 7
Running the same experiment five times yourself is called this.
Repitition
Scientific knowledge changes when this becomes available.
New evidence
The ability for another scientist to follow the same procedure and obtain similar results.
Validity
A scientist tests fertilizer on one set of plants but not another. The plants receiving fertilizer are the ______.
Experimental Group
Name two constants used in the Brine Shrimp experiment.
the type of shrimp, amount of liquid, well plate, or temperature
When another scientist follows your procedures and gets similar results, it is called this.
Replication
Name this Theory or Law...
1. All living things are made of cells.
2. Cells are the basic units of structure and function in living things.
3. Living cells come only from other living cells.
Cell Theory
Another scientist follows the same procedures to copy an experiment; ensures accuracy and validity of the results.
Replication
A student changes both the amount of water and amount of sunlight in an experiment. Why is the experiment invalid?
More than one independent variable was changed
A student writes:
"The brine shrimp in pH 9.5 had fewer leg beats than the shrimp in pH 7. Therefore, ALL marine organisms survive best at pH 7."
Using Nature of Science concepts, explain why this conclusion is not scientifically valid.
The student is overgeneralizing from one experiment
Scientists repeat trials to improve this quality of an experiment.
Reliability
Name this Theory or Law:
1. An object at rest stays at rest.
2. Force equals mass multiplied by acceleration(F=ma)
3. For every action, there is an equal and opposite reaction.
Newton's Laws of Motion
You are investigating why fish are disappearing from a pond. You do not change anything in the environment. You record fish populations, water quality, and weather conditions for six months. What scientific method are you using, and why?
Investigation