| As per the International Union for Conservation of Nature (IUCN) there are 57 critically endangered species of animals in India. A taxon is critically endangered when it meets which of the following criteria |
| 1. Population have declined or will decrease, by greater than 80% over the last 10 years or three generations. |
| 2. Have a restricted geographical range. |
| 3. Small population size of less than 2500 individuals and continuing decline at 25% in 3 years or one generation. |
| 4. Very small or restricted population of fewer than 500 mature individuals. |
| 5. High probability of extinction in the wild. |
| Which of the statements given above is/are true? |
A) 2, 3, 4 and 5
B) 1, 2 and 5
C) 3, 4 and 5
D) All of the above
Correct Answer: B
Solution :
To be defined as critically endangered in the Red List, a species must meet any of the following criteria (A-E) ("3G/10Y" signifies three generations or ten years?whichever is longer?over a maximum of 100 years; "MI" signifies Mature Individuals): A: Occurring over less than \[100\,k{{m}^{2}}\]and two of: 1. Severe habitat fragmentation or existing at just one location 2. Decline in extent of occurrence, area of occupancy, area /extent /quality of habitat, number of locations/subpopulations, or amount of MI. 3. Extreme fluctuations in extent of occurrence, area of occupancy, number of locations/subpopulations, or amount of MI. B: As above, but less than \[100\,k{{m}^{2}}\] (used to show differing levels of severity). C: Declining population of less than 250 MI and either: 1. A decline of 25% over 3G/10Y; 2. Extreme fluctuations, or over 90% of MI in a single subpopulation, or no more than 50 MI in any one subpopulation. D: Numbers less than 50 MI. E: At least 50% chance of going Extinct in the wild over 3G/10Y
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