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Doctors Medicines MCQs Q&A

  1. Zone of clearer water
  2. Zone of Recovery
  3. Zone of active decomposition
  4. Zone of degradation
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1 Answers

Option 3 : Zone of active decomposition

Explanation:

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Correct order is

Zone A – Zone of clear water

Zone B – Zone of Degradation

Zone C – Zone of Active decomposition

Zone D – Zone of Recovery

Zone E – Zone of recovery

Zone

Main Characteristics

Zone of Clear Water (1 & 5)

Clear water,  presence of fishes.

100% saturation

Zone of Degradation (2)

Dissolved oxygen level falls due to the decomposition of Organic Matter in this Zone.

Dark and turbid water.

Fishes may present

Algae are absent.

40% saturation

Zone of Active Decomposition (3)

Zone of heavy pollution.

Water is very dark and turbid

Dissolved oxygen level falls to Zero.

Critical Oxygen Deficient occurs.

Evolution of harmful gases such as CH4, CO2, H2S

Formation of the dirty scum layer.

Both fishes and algae absents

0% saturation

Zone of recovery (4)

Dissolved oxygen level increases and may reach to saturated value.

Decomposition of organic matter takes place up to the Nitrate level.

Both fishes and Algae reappear.

BOD falls down.

40% saturation
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