Dead Zone (Open Note Lab Grade) (2023)

Last updated over 1 year ago
12 questions
2

What happens to the dissolved oxygen (the oxygen that is in the water) between May 1st and 15th based on the data in Figure 1.

There are two main ways oxygen gets dissolved in water. The first occurs when air mixes with water. More oxygen gets mixed in when the water is moving around a lot, when waves crash, or when water flows over rocks.

The second way oxygen gets into water is when it is released by producers such as underwater plants or other aquatic life that uses photosynthesis. Phytoplankton are single-celled organisms that add oxygen to water in this way, through photosynthesis.
2

Phytoplankton carry out photosynthesis. What do you think typically happens to the phytoplankton population in the spring, when solar energy to the Gulf of Mexico region increases after winter.

4
How is the phytoplankton population related to the oxygen concentration in Figure 1 (see the graph).

Phytoplankton perform __________ which causes oxygen levels to __________
2

What do you think would happen to the concentration of carbon dioxide in the water during the same time period, May 1-15?

2

Describe what is happening to dissolved oxygen (oxygen in the water) between May 15th and 31st, based on the data in Figure 2.

2

What process did you predict was responsible for the decrease in dissolved oxygen.

4

Consumers and decomposers that eat the phytoplankton are also present In the Gulf of Mexico. As the phytoplankton population increases, so do the populations of consumers and decomposers. How might the presence of increased numbers of consumers and decomposers help explain the decrease in the oxygen concentration?

Be sure to mention the process that consumers perform.

4
From May 15 to May 31, the number of consumers and decomposers increased. What do you think would happen to the concentration of carbon dioxide in the water.

As the number of consumers and decomposers increase, the concentration of carbon dioxide __________ because consumers perform __________
8

Make your model below OR make your model on paper.

1

Each phytoplankton only lives a few days. When they die, they sink to the bottom, where they are decomposed by bacteria. As more and more phytoplankton die and fall to the bottom, what do you expect happens to bacteria populations?

1

What process do decomposers (consumers) use to break down dead organisms in order to create energy.

The graph shows how concentrations of dissolved oxygen (O2) and carbon dioxide (CO2) gases change in pond water on a warm, sunny day
2
Between 6 a.m. and 6 p.m., the rate of __________ is greater than the rate of __________