You decide to do an experiment testing how ectothermic (cold-blooded) organisms

Question

You decide to do an experiment testing how ectothermic (cold-blooded) organisms respond to changes in temperature. You choose to use goldfish as your experimental organism. You take 50 goldfish and put them in groups of 10. Each group of 10 is placed in a fish tank with different temperatures, but the same water conditions with regards to pH, salinity, etc. The five temperatures are 15 °C, 20 °C, 25 °C, 30°C, and 35°C. You measure the response by observing the number of movements made by the goldfish in one minute. You repeat this three times for each goldfish you examine. 22. What is the independent variable for the experiment? a. b. c. d. The water conditions in the tank. The temperature of the water The number of goldfish in the tank The number of movements made by the fish.

Explanation / Answer

ANSWER is : c. The number of goldfish in the tank.

EXPLANATION :

Independent variable is the variable that is varied by an experimenter. It is the input of the variable and a dependent variable is the output.

We can control an independent variable but cannot control dependent variable.

In this example, we are testing how ectothermic (cold-blooded) organisms respond to changes in temperature. We choose goldfish as our experimental organism, with different temperatures, but the same water conditions with regards to pH, salinity, etc. We measure the response by observing the number of movements made by the goldfish in one minute.

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