Q. No.What exotic introduction is threatening indigenous catfishes in our rivers?
1.
Carassius auratus
2.
Carcinus maenas
3.
Centaurea solstitialis
4.
Clarias gariepinus
Introduction of Lates niloticus led to the extinction of:
| 1. | Gambusia | 2. | Pupfish |
| 3. | Cichlid fish | 4. | Chinook salmon |
Loss of biodiversity may lead to all except:
| 1. | decline in plant production |
| 2. | increased resistance to environmental perturbance |
| 3. | increased variability in water use |
| 4. | increased variability in pest and disease cycle |
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
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 |
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