A
1 only
B
3 only
C
1 and 2
D
2 and 3
Correct answer: (d) 2 and 3
Explanation
- A
1 only
1 only. Barcoding does not date an organism the way rings or radiocarbon do.
- B
3 only
3 only. Look-alike species ID is also a core use.
- C
1 and 2
1 and 2. Statement 1 fails.
- D
2 and 3
2 and 3. DNA barcodes separate cryptic species and can flag undeclared animal/plant matter in foods. Not an ageing tool.
Summary. Official key is (d) 2 and 3. DNA barcoding (COI and other loci) distinguishes similar-looking species and can detect adulteration in processed foods. It does not measure age.
Same topic · past papers
UPSC has asked this before
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