Infectious Diseases and Scientific Method

Select the variable that a scientist is testing in a scientific experiment (also called the manipulated variable)

• Controlled Variable

• Dependent Variable

• Independent Variable

Select the variable that the scientist is measuring as data in an experiment (also called the responding variable).

• Controlled Variable

• Dependent Variable

• Independent Variable

Tags

NGSS.MS-PS2-2

A scientist is investigated which type of food grew the most bacteria when left out. The scientist left out chicken, crackers, and carrots for four hours, took a sample, and then counted how many bacteria grew on a petri dish. What is the dependent variable in this experiment?

• Amount of Time

• Amount of Bacteria

• Type of Food

• Type of Bacteria

A scientist is investigated which type of food grew the most bacteria when left out. The scientist left out chicken, crackers, and carrots for four hours, took a sample, and then counted how many bacteria grew on a petri dish. What is the independent variable in this experiment?

• Amount of Time

• Amount of Bacteria

• Type of Food

• Type of Bacteria

A scientist is investigated which type of food grew the most bacteria when left out. The scientist left out chicken, crackers, and carrots for four hours, took a sample, and then counted how many bacteria grew on a petri dish. What is a controlled variable in this experiment?

• Amount of Time

• Amount of Bacteria

• Type of Food

• Type of Bacteria

When a scientists does multiple trials of the same experiment, this is called (a)   .

When a scientist completes(copies) the work of another scientist or if a scientist does their own experiment again, it is called (a)   .

In the bacteria growing on food experiment, what could the scientist do to make sure that the data that they collected was accurate.

• Repeat with more Trials

• Have another Scientist Replicate the experiment

• Replicate the Experiment Themselves

• The experiment is already accurate and doesn't need to be changed

What is the difference an infectious and a noninfectious disease?

• An infectious disease is worse than a noninfectious disease

• A noninfectious disease is worse than an infectious disease

• An infectious disease is caused by a pathogen (a disease causing organism) and a noninfectious disease is environmental or genetic

• A noninfectious disease disease is caused by a pathogen (a disease causing organism) and an infectious disease is environmental or genetic

A scientist is trying to trace the source of an infectious disease. In which location(s) should they look?

• Contaminated Food

• In a person's genes

• Contaminated Water

• In a person's environment

• Another infected person