Question

unit 1 nature of science quiz
directions: read each question carefully, use c.u.b.e., and choose one correct answer by placing
an “x” next to that correct choice.

1. which scientific investigation does not include dependent and independent variables?

observing and counting bird populations
studying the effect of temperature on bacterial reproduction rates
investigating the effect of mass on the speed at which an object falls
testing a model car’s air resistance at different wind speeds in a wind tunnel

Explanation:

To determine which scientific investigation lacks dependent and independent variables, we analyze each option:

• "Studying the effect of temperature on bacterial reproduction rates": Temperature (independent) affects reproduction rate (dependent).
• "Investigating the effect of mass on the speed at which an object falls": Mass (independent) affects speed (dependent).
• "Testing a model car’s air fuel resistance at different wind speeds in a wind tunnel": Wind speed (independent) affects air fuel resistance (dependent).
• "Observing and counting bird populations": This is a descriptive study, not testing a relationship between variables (no independent/dependent variables here).

Answer:

x observing and counting bird populations