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GS Paper IUPSC Prelims 1998
Health & Medicine
Question No. 399Interactive Test Mode
00:00
+2-0.66

Q399. Which one of the following types of micro organisms is most widely used in industries?

Which one of the following types of micro organisms is most widely used in industries?

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 1998 • Science and Technology

Correct Answer: Option (D) — Bacteria, microalgae and fungi

Concept & Option Breakdown

Standard Reference Verified

Industrial biotechnology extensively uses multiple microbial groups:

  • Bacteria: Used for industrial fermentations, recombinant protein production, organic acids (lactic, acetic), antibiotics, and bioremediation.
  • Microalgae: Cultivated for biofuels, aquaculture feeds, carotenoids, and single-cell proteins.
  • Fungi (including yeasts): Indispensable for brewing, baking (Saccharomyces), enzyme production, organic acids (citric acid by Aspergillus), and antibiotics (penicillin by Penicillium). Therefore, the most comprehensive category (Bacteria, microalgae, and fungi) represents the complete spectrum of industrial microorganisms.
Elimination Heuristic & Exam Approach

When options are nested/subsets of one another, the most comprehensive and inclusive option is generally the correct UPSC choice.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1998 (Q399)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — Bacteria, microalgae and fungi

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Frequently Asked Questions — UPSC Prelims 1998 Q399

What is the official answer for UPSC Prelims 1998 GS Paper I Question 399 (Science and Technology)?

The official UPSC answer key for this 1998 Science and Technology (Health & Medicine) question is Option (D): "Bacteria, microalgae and fungi". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1998 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine 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 Health & Medicine UPSC Prelims question using option elimination?

When options are nested/subsets of one another, the most comprehensive and inclusive option is generally the correct UPSC choice.

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