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GS Paper IUPSC Prelims 2023
Biodiversity & Conservation
Question No. 199Interactive Test Mode
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+2-0.66

Q199. Consider the following statements: 1. Some mushrooms have medicinal properties. 2. Some mushrooms have psychoactive properties. 3. Some mushrooms have insecticidal properties. 4. Some mushrooms have bioluminescent properties. How many of the above statements are correct?

Consider the following statements:

  1. Some mushrooms have medicinal properties.
  2. Some mushrooms have psychoactive properties.
  3. Some mushrooms have insecticidal properties.
  4. Some mushrooms have bioluminescent properties.

How many of the above statements are correct?

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 2023 • Environment and Ecology

Correct Answer: Option (D) — All four

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is correct: Several mushrooms (e.g., Reishi, Shiitake) produce biologically active compounds utilized for immune support, antimicrobial, and cholesterol-lowering properties.

Statement 2 is correct: Psilocybin mushrooms ('magic mushrooms') contain psychoactive alkaloids like psilocybin and psilocin.

Statement 3 is correct: Many fungal species produce secondary metabolites with potent insecticidal and pest-repelling properties.

Statement 4 is correct: Over 90 species of fungi exhibit bioluminescence (e.g., Panellus stipticus, Roridomyces phyllostachydis).

Elimination Heuristic & Exam Approach

Statements formulated with non-absolute qualifiers like 'Some' carry a low burden of proof and are nearly always true in biological science questions because finding just one representative species validates the statement.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2023 (Q199)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Biodiversity & Conservation
Official Answer KeyOption (D) — All four

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Frequently Asked Questions — UPSC Prelims 2023 Q199

What is the official answer for UPSC Prelims 2023 GS Paper I Question 199 (Environment and Ecology)?

The official UPSC answer key for this 2023 Environment and Ecology (Biodiversity & Conservation) question is Option (D): "All four". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2023 question belong to?

This question belongs to GS Paper I under the subject "Environment and Ecology" and micro-topic "Biodiversity & Conservation". You can explore all repeated questions from Biodiversity & Conservation 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 Biodiversity & Conservation UPSC Prelims question using option elimination?

Statements formulated with nonabsolute qualifiers like 'Some' carry a low burden of proof and are nearly always true in biological science questions because finding just one representative species validates the statement.

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Previous Question‘Invasive Species Specialist Group’ (that develops the Global Invasive Species Database) belongs to which one of the following organisations?
Next QuestionConsider the following statements regarding the Indian squirrels: 1. They build nests by making burrows in the ground. 2. They store their food materials like nuts and seeds in the ground. 3. They are omnivorous. How many of the above statements are correct?