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Lab 5 Nutrient Pollution – Answer Sheet
The numbers in [brackets] indicate the corresponding question number in the lab notebook
Exercise 2: P in the Water 18pts 1) [6.1] Fill in the data table below. (2pts) Input | Green Algae Population Size | Dissolved Oxygen (mg/L) | 1x | | | 2x | | | 3x | | |

2) [6.2] In Microsoft Excel (I’ve provided an Excel spreadsheet, but you are welcome to use the spreadsheet application of your choice: Google Sheets, OpenOffice, etc.) plot a line graph of your green algae population size data to show how green algae relate to phosphorus input levels. Think about which is the dependent and which is the independent variable. Be sure to label your axes. Copy your completed graph into the space below. (3pts)

3) [6.3] Does the relationship between green algae population size and phosphorus level indicate that phosphorus was a limiting nutrient for green algae in the lake? Explain in 4-5 sentences. (4pts)

4) [6.4] In Microsoft Excel (or spreadsheet application of your choice: see above), plot a line graph that shows how oxygen relates to phosphorus input level. Think about which is the dependent and which is the independent variable. Be sure to label your axes. Copy your completed graph into the space below. (3pts)

5) [6.5] What is the relationship between dissolved oxygen and phosphorus in the lake? State in 1-2 sentences. (2pts)

6) [6.6] Based on your two graphs, what is the relationship between green algae population size and dissolved oxygen the lake? Provide a biological explanation for your answer. Explain in 1-2 paragraphs. (4pts)

Exercise 3: DO or Die 6pts 7) [2.1, 4.1, 5.1] Fill in the data table below. (2pts) Input | Green Algae Population Size | Dissolved Oxygen (mg/L) | 1x | | | 2x | | | 3x | | |

8) [6.1] Why could having consumers as well as producers

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