An aquatic plant known as Elodea is shown in the image below. If you observe Elodea leaves over a period of several minutes, you see bubbles forming on the leaf surface that eventually break away and rise to the surface of the water. These bubbles form as a result of photosynthesis. ( I'll post the picture below) Suppose that three samples of water are prepared as described in the following table. Three identical Elodea plants are placed in each of these water samples at the same time. How will the rate of bubble formation compare in the three samples?

Question

An aquatic plant known as Elodea is shown in the image below. If you observe Elodea leaves over a period of several minutes, you see bubbles forming on the leaf surface that eventually break away and rise to the surface of the water. These bubbles form as a result of photosynthesis. ( I'll post the picture below)  Suppose that three samples of water are prepared as described in the following table. Three identical Elodea plants are placed in each of these water samples at the same time. How will the rate of bubble formation compare in the three samples?

anonymous · Answer

Samples
A addition of carbon dioxide
B  addition of oxygen
C  degassed to remove all gases

anonymous · Answer

Answers
A. A>B>C
B.  C>B>A
C.  B>A>C
D.  A>C>B

My Answer  D.