Assertion(A): Very low concentration of a bacteria or viruses, at the time when the symptoms of the disease are not yet visible, can be detected by PCR.
Reason(R): PCR causes amplification of the nucleic acids.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Polymerase Chain Reaction: PCR |
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From NCERT
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