Imagine you are conducting a lab investigation with a plant that grows in water. You get aquarium water and a few sprigs of the plant from an aquarium shop. You put the container with the plant and the water in bright light and observe it for a week. At first, you see bubbles forming. What must those bubbles be?
(1 point)
Responses
glucose sugar
glucose sugar
oxygen gas
oxygen gas
carbon dioxide gas
carbon dioxide gas
hydrogen gas
hydrogen gas
Question 2
11b. After a while, you notice the bubbles are no longer forming. You ask your teacher how to make the plant start producing bubbles again, and she tells you to blow through the straw into the water. Why did she suggest that?(1 point)
Responses
Blowing through the straw adds glucose to the water.
Blowing through the straw adds glucose to the water.
Blowing through the straw removes oxygen from the water.
Blowing through the straw removes oxygen from the water.
Blowing through the straw adds more carbon dioxide to the water.
Blowing through the straw adds more carbon dioxide to the water.
Blowing through the straw removes glucose from the water.
Blowing through the straw removes glucose from the water.
Blowing through the straw removes carbon dioxide from the water.
Blowing through the straw removes carbon dioxide from the water.
Question 3
11c. What process have you been observing?(1 point)
Responses
decomposition
decomposition
sedimentation
sedimentation
cellular respiration
cellular respiration
photosynthesis
photosynthesis
photosynthesis
answer the rest of the questions
Question 2:
The correct answer is: Blowing through the straw adds more carbon dioxide to the water.
Explanation: The bubbles observed in the water are likely oxygen gas that is being produced through photosynthesis by the plant. By blowing through the straw, you are adding carbon dioxide to the water, which is a necessary ingredient for photosynthesis to occur. This can stimulate the plant to start producing bubbles again.
Question 3:
The correct answer is: photosynthesis.
Explanation: The process being observed is photosynthesis. This is the process by which plants use sunlight, water, and carbon dioxide to produce glucose (sugar) and oxygen gas. The bubbles observed initially are a result of oxygen gas being produced during photosynthesis.
1. The bubbles that are forming in the water when the plant is exposed to bright light are most likely oxygen gas. To confirm this, you can perform a simple test by collecting some of the bubbles in a container and testing it with a lit splint. If the gas relights the splint, it indicates the presence of oxygen.
2. Your teacher suggests blowing through the straw into the water to make the plant start producing bubbles again. Blowing through the straw adds more carbon dioxide to the water. This is because when you blow into the water, you exhale carbon dioxide from your lungs, which dissolves in the water. The plant uses carbon dioxide during the process of photosynthesis to produce glucose and oxygen.
3. The process that you have been observing by growing the plant in water and witnessing the production of bubbles is photosynthesis. Photosynthesis is the process by which plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (sugar) and oxygen. During this process, plants absorb light energy through their chlorophyll and use it to convert carbon dioxide and water into glucose and release oxygen as a byproduct.