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

Question

Which of the following is NOT a biological process in the nitrogen cycle?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Nitrogen Cycle
 **Related Topics**: Biogeochemical cycles, Nitrogen fixation, Nitrification, Denitrification, Atmospheric nitrogen
 **Prerequisites**: Basic understanding of biological processes and the role of microorganisms.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify the process that is NOT a biological process in the nitrogen cycle.
  Options: Nitrogen fixation, Nitrification, Denitrification, Lightning.
**Method & Steps**:
 1. Analyze each option to determine if it's a biological process.
  Reasoning: Biological processes involve living organisms.
 2. Identify the option that is a physical/chemical process rather than biological.
  Working: 
       * Nitrogen fixation:  Bacteria convert atmospheric nitrogen ($N_2$) into ammonia ($NH_3$), a usable form for plants. This is a biological process.
       * Nitrification: Bacteria convert ammonia ($NH_3$) to nitrites ($NO_2^-$) and then nitrates ($NO_3^-$). This is a biological process.
       * Denitrification: Bacteria convert nitrates ($NO_3^-$) back into atmospheric nitrogen ($N_2$). This is a biological process.
       * Lightning:  Lightning provides energy that causes atmospheric nitrogen ($N_2$) to react with oxygen ($O_2$) to form nitrogen oxides ($N_xO_y$). This is a physical/chemical process, not a biological one.
 3. Select the non-biological process.
  Result: Lightning
  Verification: All other options involve the actions of living organisms (bacteria).
 ## OPTION ANALYSIS
A : ✓: Nitrogen fixation is carried out by nitrogen-fixing bacteria, a biological process.
B : :x: Nitrification is a biological process performed by nitrifying bacteria.
C : :x: Denitrification is a biological process performed by denitrifying bacteria.
D : :x: Lightning is a natural electrical discharge; it is a physical process, not biological.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing lightning with nitrogen fixation: Lightning can contribute to nitrogen fixation, but it's not a biological process itself.
  2.Overlooking the role of bacteria:  Remembering that bacteria are key players in all three biological stages of the nitrogen cycle (fixation, nitrification, denitrification) is crucial.
 **Quick Tips**:
  1.Focus on the definition of 'biological process'.
  2.Remember the key players in the nitrogen cycle: bacteria.

Mr. NARESH KUMAR K · Answer

Nitrogen fixation

Mr. NARESH KUMAR K · Answer

Nitrification

Mr. NARESH KUMAR K · Answer

Denitrification

Mr. NARESH KUMAR K · Answer

The correct Option is "Lightning"

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