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Very low numbers of a pathogen can be detected early by:
ATLC
BNMR
CPCR
DESR
Answer & Solution
Correct answer: C. PCR
1. Symptoms show only once the pathogen is abundant.
2. Its nucleic acid can be amplified long before that.
3. PCR performs that amplification.
_Source: NCERT Class 12 Biology, Ch 10 'Biotechnology and its Applications'_
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