The Question is from neet-botany , and it was created by the author NISHANTH

Question

Which of the following phenomenon proves that viruses are living?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
**Primary Concept**: Characteristics of living organisms
**Related Topics**: Virus structure, Viral life cycle, Cellular processes
**Prerequisites**: Basic understanding of what defines life, Knowledge of viruses
## SOLUTION PATHWAY
**Given Information**:
*   The question asks which of the given options proves that viruses are living.
*   We need to evaluate each option against the characteristics of living things.
**Method & Steps**:
1.  Evaluate option A: 'They carry metabolic activity'.
    Reasoning: Viruses lack cellular machinery and cannot conduct metabolic activities on their own.
    Formula/Rule: N/A
2.  Evaluate option B: 'They carry anaerobic respiration'.
    Reasoning: Viruses do not respire; they rely on the host cell's machinery for energy and replication.
    Formula/Rule: N/A
3.  Evaluate option C: 'They multiply in host cells'.
    Reasoning: Replication is a fundamental characteristic of living organisms. Viruses rely on host cells for replication.
    Formula/Rule: N/A
4.  Evaluate option D: 'They cause infection'.
    Reasoning: Causing infection does not define life. Many non-living things can cause infections (toxins, etc.)
    Formula/Rule: N/A
5.  Determine the correct answer.
    Result: Option C is the correct answer.
    Verification:  Option C aligns with the fundamental characteristic of life - reproduction, even if it is dependent on a host. The other options are not directly associated with being a living organism.
## OPTION ANALYSIS
[A] :x: Viruses do not have their own metabolic machinery.
[B] :x: Viruses do not respire.
[C] ✓: Viruses replicate within host cells, which is a key characteristic of living things.
[D] :x: Causing infection is not a defining characteristic of life.
## LEARNING AIDS
**Common Mistakes**:
1.  Thinking that causing infection makes a virus living: This is incorrect as non-living things can also cause infections.
    How to avoid: Remember that replication is a key characteristic of life.
2.  Equating metabolic activity with life for viruses: Viruses do not have their own metabolism.
    How to avoid: Understand that viruses are obligate intracellular parasites.
**Quick Tips**:
1.  Focus on the key characteristics of living things: reproduction, metabolism, growth, etc.
2.  Remember that viruses are obligate intracellular parasites and rely on host cells for their life cycle.

NISHANTH · Answer

They carry metabolic activity

NISHANTH · Answer

They carry anaerobic respiration

NISHANTH · Answer

The correct Option is "They multiply in host cells"

NISHANTH · Answer

They cause infection

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