QuestionWhat is the dependent variable in a bacteria growth experiment after three days? A. temperature B. time of day C. nutrient type D. colonies count
Studdy Solution
STEP 1
Assumptions1. The experiment involves testing the growth of bacteria under different conditions.
. The same amount of bacteria is applied to identical Petri dishes enriched with nutrients.
3. Each plate is placed at a different temperature.
4. The bacteria are allowed to grow for three days.
5. The number of bacterial colonies on each plate is counted after three days.
STEP 2
In an experiment, the dependent variable is the variable that is being measured or tested. It depends on the independent variable, which is the variable that is manipulated or changed by the researchers.
STEP 3
From the given options, we need to identify which variable is the dependent variable. The dependent variable is the outcome that the researchers are measuring.
STEP 4
Option A, the temperature at which the colonies grew, is not the dependent variable. It is an independent variable because it is being manipulated by the researchers.
STEP 5
Option B, the time of day that the experiment is performed, is not mentioned in the problem as a variable that is being manipulated or measured. Therefore, it is not the dependent variable.
STEP 6
Option C, the nutrient type present in the Petri dishes, is not the dependent variable. It is not being manipulated or measured; it is a constant in this experiment because the same nutrients are used in all Petri dishes.
STEP 7
Option D, the number of bacterial colonies after three days, is the dependent variable. It is the outcome that the researchers are measuring. It depends on the temperature, which is the independent variable in this experiment.
The dependent variable in this experiment is the number of bacterial colonies after three days.
Was this helpful?
