Ecologists designed an experiment to determine if nitrates or phosphates are more limiting to algae growth. They divided a lake in Canada into two equal-sized sections by a vinyl curtain. Then they fertilized each sub-basin of the lake, one with nitrates and carbon, and the other with phosphates, nitrates and carbon. The amount of phytoplankton in the lake was then measured in each side, with the side of the lake with phosphates added showing a greater rate of phytoplankton growth.
1. Frequently, studies in nature are difficult to set up and may lack some aspects of more traditional laboratory-based experiments. What element of this experiment could be considered lacking?
A) dependent variable
B)control
C)constants
D)repeated trials
E)independent variable
MY ANSWER IS D.
2. What is the independent? I put the phosphate added to one side of the lake
3. Constant?
a. depth of the lakes
b. the nitrate and carbon added to both lakes
c. the amount of phosphate added
d. the amount of phytoplankton growth
e. the species of fish in both lakes compared to other lakes
MY ANSWER IS B....or is it A?
4. What concept below best describes the process being studied in this experiment?
a. the greenhouse effect
b. cultural eutrophication
c. denitrification in response in fertilizers
d. red tide events
e. acid rain deposition
1 answer
1 answer