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UPSC Prelims 2022 Paper-1 📅 05 Jun, 2022

Consider the following statements:
DNA Barcoding can be a tool to:
1. assess the age of a plant or animal.
2. distinguish among species that look alike.
3. identify undesirable animal or plant materials in processed foods.

Which of the statements given above is/are correct?

A
(a) 1 only
B
(b) 3 only
C
(c) 1 and 2
D
(d) 2 and 3
Result Summary
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UPSC Prelims
2022 • 05 Jun, 2022 • Paper-1
Consider the following statements:
DNA Barcoding can be a tool to:
1. assess the age of a plant or animal.
2. distinguish among species that look alike.
3. identify undesirable animal or plant materials in processed foods.

Which of the statements given above is/are correct?
Correct Answer
(d) 2 and 3
Methodology Function: DNA barcoding is a strictly taxonomic, molecular technique that utilizes a very short, standardized section of DNA from a specific gene or......
Ref/Book : UPSC Prelims 2022
Ref. Subject Science & Technology
Chapter -
Ref. Topic Biology & Biotechnology
Pg. No -
💡 Analysis & Explanation
Methodology Function ▼
DNA barcoding is a strictly taxonomic, molecular technique that utilizes a very short, standardized section of DNA from a specific gene or genes to definitively identify the exact species an organism belongs to.
Limitations ▼
Statement 1 is incorrect. While it brilliantly identifies species lineage, DNA barcoding inherently lacks the capability to determine the chronological, physical age or life-stage of an individual plant or animal. Other methods like carbon dating or dendrochronology serve that purpose.
Practical Applications ▼
Statement 2 is correct, as it is uniquely powerful in successfully resolving cryptic species that are physically identical but genetically distinct. Statement 3 is also correct; regulatory bodies heavily rely on this technique to screen processed foods and accurately detect fraudulent substitutions or hidden, undesirable organic ingredients.
Conclusion ▼
Statements 2 and 3 accurately describe the verified capabilities of this biotechnology.
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