Examine the figure below and answer the following questions using the letters below (type, A, B, C, or D in the blanks) a. Which zone has the lowest Biological Oxygen Demand? b. Which zone has the lowest Dissolved Oxygen? c. Which zone has the highest Biological Oxygen Demand? d. Which zone shows the greatest change in Dissolved Oxygen?

Concepts of Biology
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Chapter20: Ecosystems And The Biosphere
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Problem 1ACQ: Figure 20.12 Which of the following statements about the nitrogen cycle is false? a. Ammonification...
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Examine the figure below and answer the following questions using the letters below (type, A, B, C,
or D in the blanks)
a. Which zone has the lowest Biological Oxygen Demand?
b. Which zone has the lowest Dissolved Oxygen?
c. Which zone has the highest Biological Oxygen Demand?
d. Which zone shows the greatest change in Dissolved Oxygen?
Types of
organisms
Normal clean water organisms Trash fish Fish absent,
: (carp, gar. : fungi, sludge
(Trout, perch, bass,
mayfly, stonefly)
Trash fish
(carp, gar,:
leeches)
worms,
bacteria
(anaerobic)
leeches)
8 ppm
Dissolved
8 ppm
oxygen
(ppm)
Biological
oxygen
demand
Decomposition Septic
Zone
Rec very
Zone
Clean
Zone
Clean Zone
Zone
B
C
近
Transcribed Image Text:Examine the figure below and answer the following questions using the letters below (type, A, B, C, or D in the blanks) a. Which zone has the lowest Biological Oxygen Demand? b. Which zone has the lowest Dissolved Oxygen? c. Which zone has the highest Biological Oxygen Demand? d. Which zone shows the greatest change in Dissolved Oxygen? Types of organisms Normal clean water organisms Trash fish Fish absent, : (carp, gar. : fungi, sludge (Trout, perch, bass, mayfly, stonefly) Trash fish (carp, gar,: leeches) worms, bacteria (anaerobic) leeches) 8 ppm Dissolved 8 ppm oxygen (ppm) Biological oxygen demand Decomposition Septic Zone Rec very Zone Clean Zone Clean Zone Zone B C 近
Expert Solution
Distribution of water into zones

Water bodies are divided into different zones according to the presence of flora and fauna.

The following are

1-Clean zone: Water is clear than in other zones. It has high dissolved oxygen and very low biological oxygen demand. 

2-Decomposition zone: In this zone decomposition of waste or algal bloom takes place, so dissolve oxygen goes down, and biological oxygen demand increases.

3-Septic zone: In this zone, only bacteria for decomposition is survived, and all other organisms are absent. It has the very lowest dissolved oxygen.

4-Recovery zone: In this zone, decomposition stops. Recovering of dissolved oxygen starts.

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