Part C: Experimental Design Use the following hypothetical situation to answer t

Question

Part C: Experimental Design Use the following hypothetical situation to answer the Part C. questions. You live in a rural area known for its growing farming industry. This area was also once known for its large blue-spotted salamander population. In the last few decades, the population has decreased to the point that this species is now considered endangered. You want to design an experiment to aid in the recovery of the salamander population and begin by collecting the following background information The primary threat to the blue-spotted salamander is the loss, alteration, and deterioration of its habitat. They are sensitive to water quality and can be negatively affected by runoff, insecticide spraying, and other pollutants." Based on this information, you decide to design a lab-based experiment to determine the effect of insecticides on blue-spotted salamander survival. 1. Use inductive reasoning to develop a hypothesis for your experiment. 2. State a prediction to test the accuracy of your hypothesis. Complete the experimental design table for a controlled experiment you would design to test your hypothesis. 3. Experimental Design Parameters Independent variable Dependent variable Controlled variables at least two Control group Experimental group Salamander Experiment

Explanation / Answer

Hypothesis: There is an effect of insecticide on the mortality and getting endangered the salamanders.

Prediction: There will be 10% more number of salamanders in next 10 years.

Experimental Design Parameters Salamander Experiment Independent variable time taken for experiment and age of salamanders Dependent variable various parameters of water like pH, dissolved oxygen content, salinity, tyrbidity controlled variables (atleast two) water temperature and pH of water used for experiment Control group A group of salamanders under experiment without insecticide Experimental group Various groups of salamanders treated with various concentrations of insecticide for a different period of time

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