Name: ________________________________________________ Period: ___________

 

Parts of an Experiment

 

A store employee noticed that the tropical fish in one aquarium (called A) were exceptionally healthy and good breeders. He proceeded by experimentation to determine why these fish were in such fine condition. Three of his experiments are described below. Match the correct parts of each experiment with the term best used to describe it.

 

Experiment I: To test the effect of having certain aquatic plants in an aquarium.

 

_____1. Control Group                        A. Species of fish, food, temperature of water

 

_____2. Experimental Group                B. Aquarium with plants different from aquarium A

 

_____3. Manipulated Variable  C. Aquarium A

 

_____4. Responding Variable               D. The type of plant in the aquarium

 

_____5. Constants                               E. The number and health of the fish in the aquarium

 

Experiment II: To test the effect of the number of fish in an aquarium.

 

_____1. Control Group                        A. Aquarium with the same number of fish as A

 

_____2. Experimental Group                B. The number of fish in the aquarium

 

_____3. Manipulated Variable  C. The number and health of the fish in the aquarium

 

_____4. Responding Variable               D. An aquarium with more or less fish than A

 

_____5. Constants                               E. Species of fish, diets, types of plants, lighting

 

Experiment III: To test the effect of different lighting on an aquarium.

 

_____1. Control Group                        A. Type of lighting

 

_____2. Experimental Group                B. The number and health of the fish in the aquarium

 

_____3. Manipulated Variable  C. Aquarium size, species of fish, diet temperature, plants

 

_____4. Responding Variable               D. Aquarium with light identical to aquarium A

 

_____5. Constants                               E. Aquarium with more or less light than aquarium A

 

 

A farmer found that his corn crop was dying rather than being a nice healthy corn crop. He thought there were two possible reasons for the crops dying and decided to set up experiments to test the possibilities. Identify the parts of the experiments based on the purpose of each experiment.

 

PURPOSE OF EXPERIMENT I: To determine if the crops are dying due to lack of water, the farmer watered portion A of his field and left portion B alone. (Portion B received normal rain water only.)

 

 Control Group: __________________________________________________________

                       

 Experimental Group: ______________________________________________________              

 Manipulated Variable   : _____________________________________________________

 

 Responding Variable: _____________________________________________________               

Constants: ______________________________________________________________

 

PURPOSE OF EXPERIMENT II: To determine if the crops are dying due to lack of nutrients, the farmer fertilized portion C of his field and left portion D alone. (Portions C and D received normal rain water only.)

 

 Control Group: __________________________________________________________

                       

 Experimental Group: ______________________________________________________              

 Manipulated Variable   : _____________________________________________________

 

 Responding Variable: _____________________________________________________               

Constants: ______________________________________________________________