4 Question 23 (1 point)
7
In a lab experiment, a student wants to test the amount of dissolved oxygen
produced by algae. Dissolved oxygen refers to microscopic bubbles of
gaseous oxygen (02) that are mixed in water. The student's experimental design is
described below:
Flask A: Contains photosynthetic green algae and 1 hermit crab
Flask B: Contains photosynthetic green algae and O hermit crabs
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. A diagram of the experimental set-up is shown below: