lab 7.docx - Jessica W Biology 160 Kirsten McDade...

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Jessica WBiology 160Kirsten McDadeLaboratory 7 Write-Up1.One of the objectives stated, “Use a microscope and spectrophotometer to measure thecharacteristics of an algal bloom in order to support or reject predictions.” We predicted that theones with more fertilizer would create higher levels of algae. We used the microscope to countthe cell density of each sample using a hemocytometer. We also used a spectrophotometer tomeasure how much light was absorbed in each sample. We compared the results of bothmethods to each other and found the results correlated with each other.Table 2. Class data from all groups for threealgal bloom treatmentsTreatment1: 0.0 mLfertilizerGroupsAverage CellDensity (cells/mL)Average absorbanceat 400 nm11,420,0000.17424,980,0000.00531,790,0000.13341,665,0000.05356,540,0000.072658100000.094CLASSAVERAGE3,700,8330.088Treatment2: 1.0 mLfertilizer18,000,0000.28129,290,0000.15732,050,0000.23842,225,0000.10756,555,0000.103696500000.295CLASSAVERAGE6,295,0000.197Treatment3: 3.0 mLfertilizer112,320,0000.35327,320,0000.11038,330,0000.3124150,0000.02659,360,0000.122611,925,0000.300CLASSAVERAGE8,234,1670.204

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