Ecosystem Question 94
Question: The process by which a lake ecosystem is altered by eutrophication involves several stages, each causing the next. Which of the following stages would occur second in the chain of causation?
Options:
A) Algal blooms occur.
B) Oxygen levels drop in deeper water.
C) Phosphorus input from sewage and agricultural runoff increases.
D) Respiratory demand from decomposers increases.
Show Answer
Answer:
Correct Answer: A
Solution:
[a] The correct sequence is : (1) Phosphorus input from sewage and agricultural runoff increases.
(2) Algal blooms occur.
(3) Respiratory demand from decomposers increases.
(4) Oxygen levels drop in deeper water.
BETA
