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GS Paper IUPSC Prelims 1999
Biotechnology & Genetics
Question No. 31Interactive Test Mode
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+2-0.66

Q31. Assertion (A): Insect resistant transgenic cotton has been produced by inserting Bt gene. Reason (R): The Bt gene is derived from a bacterium.

Assertion (A): Insect resistant transgenic cotton has been produced by inserting Bt gene. Reason (R): The Bt gene is derived from a bacterium.

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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 1999 • Science and Technology

Correct Answer: Option (A) — Both A and Rare are true and R is the correct explanation of A.

Concept & Option Breakdown

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Assertion (A) is true: Bt cotton has been genetically modified using Cry genes to impart insect resistance against bollworms. Reason (R) is true: The Bt gene originates from the soil bacterium Bacillus thuringiensis. Since the bacterial Cry gene provides the specific biological mechanism of pest resistance, R is the direct explanation of A.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1999 (Q31)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Biotechnology & Genetics
Official Answer KeyOption (A) — Both A and Rare are true and R is the correct explanation of A.

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Questions from other UPSC Prelims years testing the same or closely linked concept.

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1999 • Q21199% Match

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Frequently Asked Questions — UPSC Prelims 1999 Q31

What is the official answer for UPSC Prelims 1999 GS Paper I Question 31 (Science and Technology)?

The official UPSC answer key for this 1999 Science and Technology (Biotechnology & Genetics) question is Option (A): "Both A and Rare are true and R is the correct explanation of A.". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1999 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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Next QuestionAssertion (A): Dolly was the first cloned mammal. Reason (R): Dolly was produced by in vitro fertilization.