A science class set up an aquarium experiment with an Elodea plant as seen in the picture below. The class observed small bubbles on days 1 and 2, but no bubbles on day 3. The class concluded that the bubbles were caused by photosynthesis. What should the class do so that the bubbles will reappear?
Add glucose to the water
Add carbon dioxide to the water
Change the light's color to green
Move the light closer
1 answer
The class should add carbon dioxide to the water. Elodea plants undergo photosynthesis to produce glucose and oxygen from carbon dioxide, water, and light energy. The bubbles observed were most likely oxygen produced during photosynthesis. If there are no bubbles on day 3, it may be because the Elodea plant has used up all the available carbon dioxide. Providing more carbon dioxide will allow the plant to continue photosynthesis and produce oxygen bubbles.
1 answer