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# A is the current population above or below the

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a. Is the current population above or below the carrying capacity? Will the population increase or decrease in the next year? b. What will be the population growth rate for 2013 (include units)? c. What will be the population size at the start of 2014. d. Fill in the following table. Then graph year vs. population size. Year Population size Population growth rate 2013 2014 2015 2016 2017 e. What happened to the population size over the years? What happened to the population growth rate over the years? f. Explain your answer from part (e) using what you know about carrying capacity. g. Explain your answer from part (e) using the formula: Ο Π Ξ Μ Ν Λ = K N K N r dt dN max

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Primary Productivity – The rate at which organic materials are stored 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 One can determine Primary Productivity by measuring dissolved oxygen in the water (as it is hard to measure it in the air) Conversion Factors: 1 ml of O 2 = .536 mg of Carbon assimilated To convert: ppm O 2 = mg O 2 /L mg O 2 /L x 0.698 = ml O 2 /L ml O 2 /L x 0.536 = mg carbon fixed/L Fill in the table and Graph Net and Gross Productivity vs % of light Using your data table, what seems to be the trend as the % of light decreases? WHY? Using your data table, what seems to be the trend as the % of light increases? WHY? Where would you say this organism is using as much energy as they are making? WHY? Using your table and graph, explain why most of the time there are bigger plants on land than in the sea? Explain this in terms of evolution % light DO (mg O 2 /L) Gross PP = Bottle – Dark (mg O 2 /L) Net PP = Bottle – Light (mg O 2 /L) Gross Carbon fixed in mgC/L Gross PP x 0.698 x 0.536 Initial 8.4 -- -- -- Dark 6.2 -- -- -- 100% 10.2 65% 9.7 25% 9.0 10% 8.5 2% 7.1
Dilution & pH Review C 1 V 1 = C 2 V 2 C 1 = original concentration of the solution, before it gets watered down or diluted. C 2 = final concentration of the solution, after dilution. V 1 = volume about to be diluted V 2 = final volume after dilution By drawing the " X " through the equal sign and filling in the formula with letters of a size permitted by the borders of the " X ", it reminds you that : for all dilution problems C 1 > C 2, and V 1 < V 2 . It makes sense because to dilute, we add water. This increases the volume but lowers concentration. Examples by Type : 1. Easiest: Joe has a 2 g/L solution. He dilutes it and creates 3 L of a 1 g/L solution. How much of the original solution did he dilute? 2. Joe has 20 L of a 2 g/L solution. He diluted it, and created 3 L of a 1 g/L solution. How did he make such a solution? 3. Joe has 20 L of a 2 g/L solution. To this solution he adds 30 L. What is the final concentration of the solution?

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pH Reminder: pH = -log (H + ) Which is more acidic? (H + ) of 1.0 x 10 -8 or 1.0 x 10 -12 Which is more basic? (H + ) of 1.0 x 10 -6 or 1.0 x 10 -3 Stomach acid has a pH of about 1-2. What would the H + concentration be around?
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