Q. No.What exotic introduction is threatening indigenous catfishes in our rivers?
1.
Carassius auratus
2.
Carcinus maenas
3.
Centaurea solstitialis
4.
Clarias gariepinus
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Introduction of Lates niloticus led to the extinction of:
| 1. | Gambusia | 2. | Pupfish |
| 3. | Cichlid fish | 4. | Chinook salmon |
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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 |
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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
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Which group, amongst the following, has the maximum percentage of species facing threat of extinction?
| 1. | Amphibians | 2. | Birds |
| 3. | Mammals | 4. | Gymnosperms |
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Which of the following species of tiger has not gone extinct?
| 1. | Bali | 2. | Javan |
| 3. | Caspian | 4. | Siberian |
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The largest carnivorous marsupial that got extinct in 20th century was:
1. Dodo
2. Quagga
3. Thylacine
4. Stellar’s sea cow
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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 |
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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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