A scientist fills a glass container with water and places an aquatic plant inside the container, then closes the lid and places the container in direct sunlight. The scientist observes small bubbles on the surfaces of the plant’s leaves on days 1 and 2, but no bubbles on day 3. If the scientist concludes that the bubbles were caused by photosynthesis, then which reactant should be added to the water in order for the bubbles to reappear?
The reactant that should be added to the water in order for the bubbles to reappear is carbon dioxide (CO2). Carbon dioxide is one of the essential reactants in photosynthesis, along with water and light energy. In the presence of carbon dioxide, aquatic plants can undergo photosynthesis and produce oxygen gas (O2), which appears as bubbles on the surfaces of the plant's leaves. Therefore, adding carbon dioxide to the water will provide the necessary reactant for photosynthesis to occur and for the bubbles to reappear.
