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microcosm_experiment

microcosm_experiment - 1 Control vs experimental 2...

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1. Control vs. experimental 2. Replication 3. Control and experimental must be the same except the experimental variable ( prevent bias) a. Environmental conditions; temp, light, water, mimic the natural conditions when doing lab work. b. Water: same source , same amount, same water chemistry c. Fertilizer: same amount for each of our experimental treatments d. Same amount of plant and snail, same spp, from the same source e. Look at the change over the experiment: even % change f. Method of measurement is accurate at both ends of the experiment. g. Prevent contamination h. Plants Null Hyp: there will no difference between your control and experimental treatment= no effect of fertilizer on plant growth Alt Hyp: there will be a diff. btwn your control and experimental treatment= there will be an effect of fertilizer on plant growth. Increase in growth and reproduction Initial increase in plant growth barb2right then decrease threshold effect: if the levels are too high then barb2right die off Aquatic Animal
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