Duplicate of The Dead Zone

Question 1

The term anoxic refers to the absence of what molecule?

Accepted Answer

Oxygen gas

Question 2

Which graph depicts the most hypoxic conditions?

Accepted Answer

September

Question 3

What human activity could lead to phytoplankton blooms?

Accepted Answer

waste water treatment, run off, factory emissions, agriculture/fertilizer use

Question 4

The term hypoxic means... (HINT: what is hypo-?)

Accepted Answer

DO content is less than 2-3mg/L, but still above zero

Question 5

An excess of which of the following would most likely be associated with dead zone formation ?

Accepted Answer

nitrogen

Question 6

Which correctly expresses the relationship between decomposition & dissolved oxygen?

Accepted Answer

Decomposition uses dissolved oxygen, removing it from water

Question 7

Which of the following DO content would be considered "normal" and supportive of marine life?

Accepted Answer

6 mg/L

Question 8

Typically dissolved oxygen is expressed in...

Accepted Answer

milligrams per liter

Question 9

In which month do you think eutrophication was not occurring?

Accepted Answer

November

Question 10

This term refers to an ecological imbalance caused by excess nutrients.

Accepted Answer

Eutrophication

Question 11

D.O. content readings- Gulf of Mexico Aug-Nov '93. Which depicts the mostly anoxic conditions?

Accepted Answer

August

Question 12

Based on the graphs, in which months could phytoplankton blooms occur in the Gulf?

Accepted Answer

August, September, and October

Questions 12