Biology Forum › Zoology Discussion › AP Biology Homework, help please!!
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- August 22, 2010 at 11:28 pm #13687
DearAmsterdamParticipantOkay I swear I have read over this 10 times and I am convinced that it’s a trick question, please help me!:
An experiment on a species of small freshwater fish recorded their behavioral responses to different temperatures. Ten fish were each tested once, one at a time.
To begin the experiment, a fish was removed from a stock tank (maintained at 22 degrees Celsius) and placed in a temperature-gradient tank. After the fish had spent 30 minutes in the temperature-gradient tank , the section where the fish was located was recorded. Additional observations were recorded every 5 minutes, for a total of 7 observations per fish.
1. Identify TWO variables that were not specifically controlled in the experimental design.
- August 24, 2010 at 8:26 am #100992JackBeanParticipant
what about age and sex of the fishes? The oxygen level seems not to be controled as well (and is IMHO important) or basically the composition of the water
- August 24, 2010 at 9:36 pm #101001DarbyParticipant
Seems like the stock tank water should have been used in both.
We can’t tell whether the lighting was controlled, or whether the gradient was tested "backward."
There really isn’t a basic control – transfer the fish without the gradient and see if they orient anyway.
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