Question

1. set up a line graph, with depth (0 - 50 m) on the y - axis, but do it upside down, so that a depth of 0 m is at the \surface\. 2. put dissolved oxygen (0 - 10 mg/l) on the x - axis. 3. title the graph oxygen minimum layer. 4. plot the points on your graph, and connect with a line. 5. answer the following questions, to the right of the graph: questions draw two lines to section off the oxygen minimum layer. this will create a surface layer and a deep layer above and below the oml. list 2 - 3 biological processes that are happening in each of the layers explain why this graph would vary with different locations. depth (m) 0 100 200 300 400 500 600 700 800 900 1000 dissolved oxygen (mg/l) 6.7 6.5 5.7 4.1 0.5 0.5 0.8 1.7 2.3 2.8 2.8

Explanation:

Step1: Set up the graph

On a graph - paper, mark depth (0 - 50 m) on the upside - down y - axis and dissolved oxygen (0 - 10 mg/L) on the x - axis.

Step2: Plot the points

Using the data from the table (depth in m and dissolved oxygen in mg/L), mark the corresponding points on the graph. For example, at a depth of 0 m, the dissolved oxygen is 6.7 mg/L, so mark the point (6.7,0).

Step3: Connect the points

Draw a line to connect all the plotted points to form a curve representing the relationship between depth and dissolved oxygen.

Step4: Title the graph

Write the title "Oxygen Minimum Layer" at the top of the graph.

Step5: Draw two lines for oxygen minimum layer

Identify the region where the dissolved oxygen is at its minimum. Draw two horizontal lines to mark the boundaries of this oxygen - minimum layer.

Step6: List biological processes

Above the OML, photosynthesis by phytoplankton can increase dissolved oxygen levels as they produce oxygen during the day. Below the OML, respiration by organisms consuming organic matter can deplete oxygen.

Step7: Explain graph variation

The graph varies with location due to differences in factors like water temperature, salinity, primary productivity, and the rate of organic matter decomposition. Warmer water can hold less oxygen, and areas with high primary productivity may have higher surface - water oxygen but more oxygen consumption below the surface due to decomposition.

Answer:

1. Graph is set up with depth on upside - down y - axis and dissolved oxygen on x - axis. Points are plotted from the data table and connected with a line. Title "Oxygen Minimum Layer" is added. Two lines mark the oxygen - minimum layer.
2. Above OML: Photosynthesis by phytoplankton can increase oxygen. Below OML: Respiration by organisms consuming organic matter can decrease oxygen.
3. Graph varies with location due to differences in water temperature, salinity, primary productivity, and organic matter decomposition rate.