The Question is from neet-chemistry environmental-chemistry , and it was created by the author P SRAVAN KUMAR

Question

A lake is found to have a high concentration of nitrates and phosphates.  Which of the following is the LEAST likely direct consequence of this eutrophication?

P SRAVAN KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Eutrophication
 **Related Topics**: Water pollution, algal blooms, dissolved oxygen, biological oxygen demand (BOD)
 **Prerequisites**: Understanding of nutrient cycles in aquatic ecosystems.
## SOLUTION PATHWAY
**Given Information**:
  High concentration of nitrates and phosphates in a lake (indicating eutrophication).
**Method & Steps**:
 1. Understand Eutrophication: Eutrophication is the excessive richness of nutrients in a body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.
  Reasoning: Excess nitrates and phosphates fuel rapid growth of algae and other aquatic plants.
 2. Analyze the consequences:  Increased algal blooms, depletion of dissolved oxygen, and increased BOD are all direct consequences of eutrophication.
  Working: Algal blooms block sunlight, leading to the death of submerged plants.  Decomposing plants and algae consume significant amounts of dissolved oxygen, lowering oxygen levels and increasing BOD (Biological Oxygen Demand). This leads to fish kills and other ecosystem disruptions.
 3. Identify the least likely consequence: Increased dissolved oxygen levels are the opposite of what happens during eutrophication.
  Result: Increased dissolved oxygen levels are the least likely direct consequence.
  Verification: The other options are all well-established consequences of eutrophication.
 ## OPTION ANALYSIS
A ✓: Increased algal blooms are a direct result of the increased nutrient levels in the water. 
B :x: Depletion of dissolved oxygen is a direct consequence due to the decomposition of excessive algae and plants consuming oxygen.
C :x: Increased biological oxygen demand (BOD) is directly linked to the increased decomposition activity caused by the excessive growth of algae and plants. 
D :x: Increased dissolved oxygen levels are NOT a direct consequence; in fact, the opposite occurs during eutrophication. 
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing eutrophication with other water quality issues:  Eutrophication is specifically about nutrient enrichment.
  2.Failing to connect the decomposition process to oxygen depletion:  Understanding the role of decomposers is crucial.
 **Quick Tips**:
  1.Remember the key players: Nitrates, phosphates, algae, decomposers, and dissolved oxygen are all interconnected in eutrophication.
  2.Visualize the process: Imagine a lake becoming choked with algae and plants, leading to oxygen depletion.

P SRAVAN KUMAR · Answer

Increased algal blooms

P SRAVAN KUMAR · Answer

Depletion of dissolved oxygen

P SRAVAN KUMAR · Answer

Increased biological oxygen demand (BOD)

P SRAVAN KUMAR · Answer

The correct Option is "Increased dissolved oxygen levels"

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