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. The scientist concludes that the bubbles were caused by photosynthesis. Which substance should be added to the water in order for the bubbles to reappear?

Answer 1

The substance that should be added to the water in order for the bubbles to reappear is carbon dioxide (CO2). Carbon dioxide is one of the reactants in the process of photosynthesis, along with water and sunlight. By adding carbon dioxide to the water, the aquatic plant will have access to all the necessary elements for photosynthesis to occur, leading to the production of oxygen bubbles on the plant's leaves.