Question

what is happening to the level of carbon dioxide in the experimental test tube with the elodea leaf as indicated by the red color in the tube? a. the level of carbon dioxide is increasing. b. the level of carbon dioxide is decreasing. c. the level of carbon dioxide is unchanged. what is happening to the level of carbon dioxide in the negative control test tube without the elodea leaf as indicated by the yellow color in the tube? a. the level of carbon dioxide is increasing. b the level of carbon dioxide is unchanged. c. the level of carbon dioxide is decreasing.

Explanation:

Elodea is a plant that undergoes photosynthesis, which uses carbon - dioxide. In the experimental test tube with Elodea, carbon - dioxide is used for photosynthesis, so its level decreases. In the negative control test tube without Elodea, there is no photosynthetic or other significant process affecting carbon - dioxide levels, so it remains unchanged.

Answer:

For the first question: B. The level of carbon dioxide is decreasing.
For the second question: B. The level of carbon dioxide is unchanged.