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Q32 (IAS/2026) Environment & Ecology › Biodiversity & Protected Areas Official Key

With respect to the Western Hoolock Gibbons, which of the following statements is/are correct?
1. A Sanctuary in North-east India is home to this ape species listed as Endangered in the International Union for Conservation of Nature (IUCN) Red List.
2. They have specialized brachiation and can easily swing between trees.
3. They possess a strong and heavy build like gorillas, yet are remarkably agile tree climbers.
Select the answer using the code given below:

Result
Your answer:  ·  Correct: B

Explanation

Statement 1 is correct: The Western Hoolock Gibbon (Hoolock hoolock) is listed as Endangered on the IUCN Red List. The Hoollongapar Gibbon Sanctuary in Assam, North-east India, is specifically dedicated to the conservation of this ape species.

Statement 2 is correct: Gibbons are highly adapted to an arboreal lifestyle. They possess a specialized mode of locomotion called brachiation, which allows them to swing effortlessly from branch to branch using their exceptionally long arms.

Statement 3 is incorrect: Gibbons are classified as "lesser apes." Unlike great apes such as gorillas, which possess a strong, heavy, and robust build, gibbons have a slender and lightweight body structure perfectly suited for canopy living and agile movement.

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PROVENANCE & STUDY PATTERN

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Don’t just practise – reverse-engineer the question. This panel shows where this PYQ came from (books / web), how the examiner broke it into hidden statements, and which nearby micro-concepts you were supposed to learn from it. Treat it like an autopsy of the question: what might have triggered it, which exact lines in the book matter, and what linked ideas you should carry forward to future questions.
With respect to the Western Hoolock Gibbons, which of the following statements is/are correct? 1. A Sanctuary in North-east India is home to…
At a glance
Origin: Books + Current Affairs Fairness: Low / Borderline fairness Books / CA: 2.5/10 · 7.5/10
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This question is a classic UPSC trap mixing basic static knowledge (Gibbons in NE India) with behavioral/anatomical trivia. While the IUCN status and location are standard, the physical build statement requires either deep reading or sharp common sense regarding animal morphology.

How this question is built

This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.

Statement 1
IUCN Red List conservation status of the Western Hoolock Gibbon
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable
Web / Current Affairs
dri.nic.in Primary · Govt
Presence: 5/5
Why this source?
  • Official government source from the Meghalaya Biodiversity Board.
  • Explicitly states the IUCN Red List classification for the Western Hoolock Gibbon.
  • Distinguishes it from the Eastern Hoolock Gibbon and mentions its legal protection under the Wildlife (Protection) Act, 1972.
cza.nic.in Primary · Govt
Presence: 5/5
"It is categorized as 'Endangered' A2acd+3cd+4acd based on the IUCN Red List Criteria, 2009."
Why this source?
  • Official document from the Central Zoo Authority (CZA), Ministry of Environment, Forest and Climate Change.
  • Provides the specific IUCN Red List criteria (A2acd+3cd+4acd) used for the 'Endangered' classification.
  • Confirms the status of the Western Hoolock Gibbon (Hoolock hoolock) specifically.
wii.gov.in Primary · Govt
Presence: 5/5
"Dwindling numbers, primarily due to habitat loss, habitat degradation and hunting, have led them to be classified as Endangered in the International Union for Conservation of Nature's (IUCN) Red List."
Why this source?
  • Published by the Wildlife Institute of India (WII), an autonomous institution under the Ministry of Environment, Forest and Climate Change.
  • Confirms the 'Endangered' status in a recent 2023 publication.
  • Notes the species' presence in the Hoollongapar Gibbon Sanctuary.
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