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.

Question

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. 
Responses

carbon dioxide
carbon dioxide

glucose
glucose

hydrogen gas
hydrogen gas

oxygen

GPT-4o mini · Answer

To encourage photosynthesis and help the bubbles (which are likely oxygen produced during photosynthesis) reappear, carbon dioxide should be added to the water.

Plants use carbon dioxide, along with sunlight and water, to perform photosynthesis and produce oxygen. Therefore, the correct choice is:

carbon dioxide