In a lab experiment, a student wants to test the amount of dissolved produced by algae. The student's experimental design is described below:
Flask A: Contains photosynthetic green algae and 1 fish
Flask B: Contains photosynthetic green algae but no fish
Both flasks are placed under a light bank. The lights are set to cycle between 12
hours of dark and 12 hours of light. The dissolved oxygen concentrations in both
flasks are recorded daily.
Which of the following is the best prediction as to the dissolved oxygen
concentrations in both flasks after one week? (AKS 4b)
a)
The dissolved oxygen in flask B will be higher. Flask A will have less dissolved
oxygen because the fish uses some of it for cellular respiration.
There will be no difference in the dissolved oxygen in Flask A and B because
b)
the same amount of algae is present in both flasks.
Ith flocks the dissolved oxygen will be the same during the light hours but