A flask containing photosynthetic green algae and a control flask containing only water are exposed to a cycle of 12 hours of light and 12 hours of darkness. Which of the following statements best describes how the relative dissolved oxygen concentration in the flask with algae will compare to the control flask?
A. The dissolved oxygen in the flask with algae will not be different from the control flask at any time.
B. The dissolved oxygen in the flask with algae will always be higher.
C. The dissolved oxygen in the flask with algae will be higher in the light, but lower in the dark.
D. The dissolved oxygen in the flask with algae will always be lower.
E. The dissolved oxygen in the flask with algae will be higher in the light, but the same in the dark.

The option that correctly describes the relative dissolved oxygen concentration in the flask with algae will compare to the control flask is C. The dissolved oxygen in the flask with algae will be higher in the light but lower in the dark.

What factors can increase the amount of dissolved oxygen in water?

Temperature, pressure, salinity and biological organisms are the major contributing factors that affect dissolved oxygen.
If the medium contains a photosynthetic plant that too in the presence of light, then this will increase the dissolved oxygen.
On the other hand, increased salinity and warm water decrease the amount of oxygen dissolved in water.
As given above, the flasks containing the green algae and water are given 12 hours of light and then put 12 hours in darkness.
The flask that contains the algae contains more dissolved oxygen during the light hours as algae are photosynthesis in nature and thus, they will do photosynthesis during 12 hours of lighting.
But, the control flask contains only water and thus, there will be no addition of dissolved oxygen.

Thus, we can conclude that flask that contains algae have more amount of oxygen dissolved than the control flask containing only water. During 12 hours of darkness, no photosynthesis occurs and hence algae containing flask will have a lower amount of dissolved oxygen.

Learn more about dissolved oxygen here:

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