RAS question
Which IUCN Red List category indicates a species facing an extremely high risk of extinction in the wild?
Correct answer: (C) Critically Endangered (CR).
Critically Endangered (CR) is the IUCN Red List category for a species facing an extremely high risk of extinction in the wild.
Explanation
The IUCN Red List uses a graded set of categories to show how close a taxon is to extinction. In the threat sequence given here, risk rises from Least Concern and Near Threatened to Vulnerable, Endangered and then Critically Endangered, before Extinct in the Wild and Extinct. The cited IUCN Red List Categories and Criteria define Critically Endangered as applying when the best available evidence shows that a taxon meets the relevant CR criteria, meaning it is considered to face an extremely high risk of extinction in the wild. That wording is stronger than Vulnerable's high risk and Endangered's very high risk, so CR is the category asked for in the question.
Why the other options are wrong
- (A) Vulnerable (VU) indicates a high risk of extinction in the wild, but it is below Endangered and Critically Endangered in the threat sequence.
- (B) Endangered (EN) indicates a very high risk of extinction in the wild, while the IUCN reserves extremely high risk for Critically Endangered.
- (D) Near Threatened (NT) covers taxa that are close to qualifying, or likely to qualify, for a threatened category, not taxa already facing an extremely high extinction risk.
Concept
This tests the Environment and Ecology syllabus point on biodiversity conservation categories and Red List terminology. RAS repeats it because conservation status terms are easy to confuse but central to wildlife and environmental policy questions.