11. 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?

Question

sun
6 CO2 + 6 H 2 O ---------> C6H12O6+ 6 O2

1.carbon dioxide gas
2.oxygen gas
3.glucose sugar
4.hydrogen gas

Answer 1

The correct answer is carbon dioxide gas. In the process of photosynthesis, carbon dioxide is converted into glucose and oxygen. If there are no bubbles on day 3, it suggests that there is a lack of carbon dioxide available for the plant to perform photosynthesis. By adding carbon dioxide gas to the water, the plant will have the necessary reactant to produce glucose and oxygen, resulting in the re-appearance of bubbles.