RAS question
The IUCN Red List category 'Critically Endangered' is denoted by which abbreviation?
Correct answer: (A) CR.
In the IUCN Red List, the category Critically Endangered is abbreviated as CR.
Explanation
CR stands for Critically Endangered in the IUCN Red List classification. The cited IUCN Categories and Criteria document lists the category as “CRITICALLY ENDANGERED (CR)” and defines it as applying when the best available evidence shows that a taxon meets any of the relevant criteria A to E and is therefore facing an extremely high risk of extinction in the wild. This fits the existing Red List sequence of categories: NE, DD, LC, NT, VU, EN, CR, EW and EX. The key exam point is that CR is the standard abbreviation for the highest threatened category before extinction-related categories such as Extinct in the Wild and Extinct.
Why the other options are wrong
- (B) EN denotes Endangered, which the IUCN lists separately from Critically Endangered and defines as a very high, not extremely high, risk category.
- (C) VU denotes Vulnerable, a lower threatened category that the IUCN describes as facing a high risk of extinction in the wild.
- (D) CE is not one of the IUCN Red List abbreviations in the stated category set, where Critically Endangered is written as CR.
Concept
This tests the Environment and Ecology syllabus area on conservation status and international biodiversity classifications. It recurs in RAS because IUCN Red List categories are a standard shorthand in questions on species protection, threatened taxa and conservation policy.