Think again about the chemical reaction for photosynthesis.

Question

11a. 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

carbon dioxide gas
carbon dioxide gas

glucose sugar
glucose sugar

oxygen gas
oxygen 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 removes oxygen from the water.
Blowing through the straw removes oxygen from the water.

Blowing through the straw adds glucose to the water.
Blowing through the straw adds glucose 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.

Blowing through the straw adds more carbon dioxide to the water.
Blowing through the straw adds more carbon dioxide to the water.
Question 3
11c. What process have you been observing?(1 point)
Responses

decomposition
decomposition

sedimentation
sedimentation

cellular respiration
cellular respiration

photosynthesis

Answer 1

Question 1 (11a): The bubbles that are forming from the plant in the aquarium water are most likely oxygen gas. This is a byproduct of photosynthesis, where the plant uses carbon dioxide and water in the presence of light to produce glucose and oxygen.

Question 2 (11b): Your teacher suggested that you blow through the straw into the water to add more carbon dioxide to the water. This is because blowing air (which contains carbon dioxide) into the water increases the carbon dioxide concentration that the plant can use for photosynthesis, leading to more oxygen production and bubble formation.

Question 3 (11c): The process you have been observing is photosynthesis. This is the process through which plants convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.