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
In the IUCN Red List classification, CR is the standard abbreviation for Critically Endangered. This category applies when the best available evidence shows that a taxon meets any relevant criterion from A to E and therefore faces an extremely high risk of extinction in the wild. The sequence of the 9 categories is NE, DD, LC, NT, VU, EN, CR, EW and EX. In this sequence, EN means Endangered and VU means Vulnerable, while EW and EX are extinction-related categories. Thus, CR is the highest threatened category before EW and EX; EN, VU and CE are not correct abbreviations for Critically Endangered.
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 question tests the Environment and Ecology syllabus area on conservation status and international biodiversity classifications. It recurs in RAS because IUCN Red List categories and their abbreviations are commonly used in questions on species protection, threatened taxa and conservation policy.