The Question is from neet-chemistry environmental-chemistry , and it was created by the author Mr. S M HUSSAIN

Question

The presence of which of the following in a water sample indicates fecal contamination?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Water quality indicators and fecal contamination
 **Related Topics**: Microbiology, environmental science, public health
 **Prerequisites**: Basic understanding of bacteria and their role in the environment.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about indicators of fecal contamination in a water sample.
**Method & Steps**:
 1. Identify organisms associated with fecal matter.
  Reasoning: Fecal contamination is indicated by the presence of microorganisms typically found in the intestines of animals, particularly humans.
 2. Analyze the given options for such indicators.
  Working: 
        * **Diatoms:**  are algae, not typically associated with fecal matter.
        * **Coliform bacteria:** are a group of bacteria that are commonly found in the intestines of humans and animals.  Their presence strongly suggests fecal contamination.
        * **Dinoflagellates:** are single-celled organisms, not specifically linked to fecal contamination.
        * **Cyanobacteria:** (also known as blue-green algae) are photosynthetic bacteria, not typically used as indicators of fecal contamination.
 3. Select the correct option.
  Result: Coliform bacteria (option B) are the most reliable indicator of fecal contamination in water samples.
  Verification: The presence of coliform bacteria is a widely used and accepted indicator of fecal contamination in water quality testing.
 ## OPTION ANALYSIS
A :x: Diatoms are algae and not indicators of fecal contamination.
B ✓: Coliform bacteria are strong indicators of fecal contamination because they are commonly found in feces.
C :x: Dinoflagellates are not associated with fecal contamination.
D :x: Cyanobacteria are not reliable indicators of fecal contamination.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing diatoms or other algae with fecal indicators: Remember that fecal indicators are bacteria specifically found in the gut.
  2.Overlooking the significance of coliform bacteria: Coliform bacteria are a key indicator, not just a possible one.
 **Quick Tips**:
  1.Remember the acronym “Coliform” to associate it with fecal contamination.
  2.Focus on the source of the organisms when trying to identify fecal contamination indicators.

Mr. S M HUSSAIN · Answer

Diatoms

Mr. S M HUSSAIN · Answer

The correct Option is "Coliform bacteria"

Mr. S M HUSSAIN · Answer

Dinoflagellates

Mr. S M HUSSAIN · Answer

Cyanobacteria

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