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Question No. 7Interactive Test Mode
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Q7. 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 above statements is/are correct?

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 above statements is/are correct?
Select the correct option below (or cross out options to eliminate)

Official Answer Key & Detailed Solution

Ready to check the official UPSC Answer Key?

Click any option above to test yourself under exam conditions, or reveal the explanation directly.

Official UPSC Answer KeyUPSC Prelims 2022 • Science and Technology

Correct Answer: Option (D) — 2 and 3

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is incorrect: DNA barcoding is used for taxonomic species identification based on standard short genetic sequences; it cannot determine the chronological age of an individual organism (which relies on techniques like carbon dating or dendrochronology). Statement 2 is correct: DNA barcoding allows precise differentiation among morphologically identical or cryptic species. Statement 3 is correct: It is extensively used in food safety and authentication to detect adulteration and identify biological components in processed foods.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2022 (Q7)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Biotechnology & Genetics
Official Answer KeyOption (D) — 2 and 3

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Frequently Asked Questions — UPSC Prelims 2022 Q7

What is the official answer for UPSC Prelims 2022 GS Paper I Question 7 (Science and Technology)?

The official UPSC answer key for this 2022 Science and Technology (Biotechnology & Genetics) question is Option (D): "2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2022 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Biotechnology & Genetics". You can explore all repeated questions from Biotechnology & Genetics in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Biotechnology & Genetics UPSC Prelims question using option elimination?

To solve Biotechnology & Genetics questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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