The Question is from neet-botany biological-classification , and it was created by the author Mr. NARESH KUMAR K

Question

In the process of biogas production from ruminant dung, which microorganisms are responsible for the final conversion of $CO_2$ and $H_2$ to methane ($CH_4$)?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B. Methanogens
## CONCEPT FRAMEWORK
 **Primary Concept**:  Methanogenesis and its role in biogas production.
 **Related Topics**: Anaerobic respiration, carbon cycle, microbial metabolism.
 **Prerequisites**: Understanding of the chemical reaction involved in methane formation.
## SOLUTION PATHWAY
**Given Information**:
  The question specifically asks about the final conversion of carbon dioxide ($CO_2$) and hydrogen ($H_2$) to methane ($CH_4$).
**Method & Steps**:
 1. Identify the microorganisms capable of this conversion.
  Reasoning: Methanogens are unique in their ability to use $CO_2$ and $H_2$ as substrates to produce methane.
  Formula/Rule: The overall reaction can be represented as:  $CO_2 + 4H_2 ightarrow CH_4 + 2H_2O$
 2. Eliminate other microorganisms.
  Working: Halophiles, thermophiles, and acidophiles are not known for this specific metabolic pathway.
  Key Point: Methanogenesis is a key step in anaerobic digestion.
 3. Confirm the answer.
  Result: Methanogens are responsible for the final step of methane production in biogas generation.
  Verification: This is supported by well-established biological principles.
 ## OPTION ANALYSIS
[A] :x: Halophiles are extremophiles that require high salt concentrations.
[B] ✓: Methanogens are the only organisms capable of directly converting $CO_2$ and $H_2$ to $CH_4$.
[C] :x: Thermophiles thrive in high temperatures, but this doesn't define their metabolic function.
[D] :x: Acidophiles prefer acidic conditions; this doesn't specify their metabolic role.
 ## LEARNING AIDS
 **Common Mistakes**:  Confusing methanogenesis with other anaerobic processes.
  1.Error 1: Choosing organisms based on general anaerobic metabolism: Focus on the specific conversion of $CO_2$ and $H_2$ to $CH_4$.
  2.Error 2: Overlooking the uniqueness of methanogens: Remember that only methanogens perform this specific reaction.
 **Quick Tips**:  Associate the chemical equation of methanogenesis with methanogens.

Mr. NARESH KUMAR K · Answer

Halophiles

Mr. NARESH KUMAR K · Answer

The correct Option is "Methanogens"

Mr. NARESH KUMAR K · Answer

Thermophiles

Mr. NARESH KUMAR K · Answer

Acidophiles

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