Short answer question:
Name the nine categories listed under the IUCN Red list
| Group | Number |
| Higher plants | 2,70,00 |
| Algae | 40,000 |
| Fungi | 72,000 |
| Mammals | 4,650 |
| Birds | 9,700 |
| Insects | 10,25,000 |
| Bacteria | 4,000 |
| Nematodes and worms | 25,000 |
| Others | 1,10,000 |
According to the IUCN(2004), the total number of plants and animals species described so far is slightly more than 1.5million, but we have no clear idea of how many species are yet to be discovered and described.