Q. No.The main difference between the “Sixth Extinction” and the previous five extinctions is that the sixth extinction:
1. is mainly occurring on islands
2. is mainly affecting plants
3. is occurring at a faster rate
4. does not involve human activities
1. is mainly occurring on islands
2. is mainly affecting plants
3. is occurring at a faster rate
4. does not involve human activities
Which group, amongst the following, has the maximum percentage of species facing threat of extinction?
| 1. | Amphibians | 2. | Birds |
| 3. | Mammals | 4. | Gymnosperms |
Which of the following species of tiger has not gone extinct?
| 1. | Bali | 2. | Javan |
| 3. | Caspian | 4. | Siberian |
The largest carnivorous marsupial that got extinct in 20th century was:
1. Dodo
2. Quagga
3. Thylacine
4. Stellar’s sea cow
Year-to-year variation shown by areas with more species is ................... with respect to areas with less species.
| 1. | less | 2. | more |
| 3. | same | 4. | absent |
Which of the following is not a reason that accounts for greater biodiversity of tropics?
| 1. | availability of more solar energy |
| 2. | more niche specialization |
| 3. | more time for species diversification |
| 4. | large seasonal variations in environmental factors |
Although, India has only 2.4 % of world’s area, its share of global species diversity is about:
| 1. | 3% | 2. | 5% |
| 3. | 8% | 4. | 11% |
Approximately, what number of species have been identified, named and studied?
| 1. | 1.0 million | 2. | 1.5 million |
| 3. | 1.7 million | 4. | 2.0 million |
The greatest biodiversity on the earth is found in:
| 1. | African grasslands |
| 2. | Amazonian rain forest in South America |
| 3. | Western Ghats in India |
| 4. | Nile delta in Egypt |
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