Lab 2 Homework - Lab 2 answers PDF

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Lab 2 answers...

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Lab 2 Homework

Part 2 ●

Does adding aspirin to water allow cut flowers to last longer?

Hypothesis: If one aspirin pill is added to the water for flowers, the flowers will remain fresh for longer than flowers that are treated with regular water. ●

Experiment:

Obtain twelve freshly cut flowers of the same variety (preferably from the same plant). Put six flowers in six separate vases, fill each vase with five cups of deionized water and 1 tablet of aspirin. Next, put 6 flowers in separate vases, fill each vase with only deionized water (five cups of water per vase). Flowers should not be exposed to sunlight and should all remain at the same 75 degrees F room temperature for the duration of the experiment. The water should not be changed throughout the duration of the experiment. Every day for four weeks, examine each flower and note the differences in appearance, texture, and freshness. -Data collected: if the stem of the flower has drooped down, if the flower has lost any petals, if the flower is growing mold -Dependent variable: Aspirin -Independent variable: The flowers -Standardized variables: temperature, sunlight allowed, type of flower, amount of water -Number of replicates: 12 flowers are tested total, experiment may be replicated as many times as needed -Level of treatment: one tablet of aspirin per vase in the treatment group

Part 3

1. The independent variable would be the amount of hours of illumination and the dependent variable would be amount of oxygen evolved. 2. The labels on the graph signify how much phosphate went into each solution of phosphate and seawater (in mg added per m^3 of seawater). Also it explains the methods they used in their experiment, exemplified by the explanation of heating the diatom within the flasks using 500 watt lamps. 3. You can’t tell what the hypothesis of the study is and whether or not that hypothesis was supported by the data and there’s no clear purpose of the experiment. Also, there’s not a discussion of possible trends in the data that could help to explain what’s going on. 4. Will length of time of illumination and amount of phosphate effect photosynthesis (i.e. oxygen production) within the solution being tested? 5. All of the results are important because each result is relative to another result. One result could not support the hypothesis but still be important in falsifying that hypothesis. Another result could support the hypothesis but without the other information the support is useless....