Question

assignment content
question 1
the sealed water bottle is an ______ environment.
a aerobic
b anaerobic
question 2
what is the independent variable in this experiment?
a yeast concentration
b sucrose concentration
c carbon dioxide levels (balloon size)
d water in the bottle with no sucrose

Explanation:

For Question 1: An aerobic environment requires oxygen. A sealed water - bottle has limited or no access to external oxygen, making it anaerobic.
For Question 2: An independent variable is what is changed in an experiment. Yeast concentration and sucrose concentration can be manipulated, while carbon - dioxide levels are a dependent variable (a result of the reaction), and water in a bottle with no sucrose is not a typical variable in a reaction - based experiment like this. Usually, yeast and sugar concentrations are varied to observe gas production.

Answer:

Question 1: B. Anaerobic
Question 2: A. Yeast concentration or B. Sucrose concentration (either can be an independent variable depending on the experiment setup)