Question

If a certain plant species is not found in its wild localities even after repeated search, then it would be listed in which category in the "Red Data Book"?

• A. Extinct
• B. Endangered
• C. Vulnerable
• D. Rare

Answer 1

The correct option is A Extinct

There are nine categories present in the 'IUCN Red List' system: extinct, extinct in the wild, critically endangered, endangered, vulnerable, near threatened, least concern, data deficient and not evaluated.

Classification into these categories occurs through a set of quantitative criteria that are based on biological factors that include the rate of decline, population size, the area of geographic distribution, and degree of population and distribution fragmentation.

A species is listed as extinct in the wild when it is known only to survive in cultivation, captivity or as a naturalized population outside the previous range. A species is presumed extinct in the wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual.