Eutrophication

Question 1

DO Stands for

a. dead organisms
b. decreased oxygen
c. decreased organisms
d. dissolved oxygen

Answer 1

D. Dissolved Oxygen

Question 2

Which of the following elements are a cause of cultural eutrophication?

a. carbon dioxide
b. Lead
c. Oxygen
d. Uranium
e. Phosphorous
f. Nitrogen

Answer 2

e. Phosphorus
f. Nitrogen

Question 3

Which of the following is not a source of nitrogen.

a. sewage
b. detergents
c. waste from feedlots (cow and pig farms)
d. fertilizer run off

Answer 3

b. Detergents

Question 4

Nitrogen and phosphorus are consumed by bacteria naturally in a balanced way.

True
False

Answer 4

True

Question 5

Place these in order

Large amounts of eutrophying nutrients enter a lake
The algae consume the nutrients
an algae bloom occurs
the algae die off
the bacteria and other microorganisms feed on the dead algae
The DO level decreases to low levels
The fish die off due to low DO levels.

Answer 5

1.Large amounts of eutrophying nutrients enter a lake
2.The algae consume the nutrients
3.an algae bloom occurs
4.he algae die off
5.the bacteria and other microorganisms feed on the dead algae
6.The DO level decreases to low levels
7. The fish die off due to low DO levels.

Question 6

Detergents can cause an increase in

a. waste from sewage
b. lead from smog
c. nitrogen from animal waste
d. phosphorus from phosphates

Answer 6

D. Phosphorus from Phosphates