O & A: Section 1.5

The factors in a controlled experiment that remain the same such as same size pot, same amount of water, same kind of plant, etc. are called the:

• variables

• procedures

• constants

• data

What can be defined as:

a possible explanation for a set of observations, or an educated guess that must be "testable."

• Scientific Theory

• Communicating

• Hypothesis

• Claim

The process of gathering facts through observations and formulating scientific hypotheses and theories is called...

• scientific hypothesis

• scientific theory

• scientific method

• scientific testing

When scientific investigation produce data that show new patterns that contradict existing conclusions, scientists should

• ignore the contradictory data and keep the conclusions

• check the data for errors and revise or replace the old conclusions if needed

• throw out the old data and use the new data only to reach new conclusions

• change the new data so that it fits the old conclusions

This variable in an experiment is the one being changed by the scientist. 

• dependent variable
• independent variable
• data
• control group

What is the part of the experiment that is left alone or “natural", and is used to compare back to?

• Independent Variable
• Dependent Variable
• Control Group
• Experimental Group 

You will want your experiment to have ____ independent variable(s) in it for the experiment to be valid.

• 1

• 2

• 3

• As many as possible

A possible explanation to a problem that has not yet been tested. 

• data
• theory
• hypothesis
• fact

Mrs. Sherry sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.

• distance traveled by the ball

• height of the ramp

• mass of the ball

• weight of the ball

A scientist investigates the effect of carbon dioxide on plant height. The scientist grows plants in several closed containers. All the plants receive the same amounts of water and light, but the air in each container has a different amount of carbon dioxide. What is the independent variable in this experiment?

• the amount of carbon dioxide in each container

• the number of plants in each container

• the amount of water provided to the plants

• the height of each plant after a period of time