Q. No.What percentage of total oxygen in the earth’s atmosphere is produced by Amazon rainforest through photosynthesis?
1.
50
2.
40
3.
30
4.
20
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The most important cause of the loss of biodiversity today is the:
1. Habitat loss and fragmentation
2. Overexploitation
3. Alien species invasion
4. Co-extinctions
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Extinction of Stellar’s sea cow and passenger pigeon was due to:
| 1. | Habitat loss and fragmentation | 2. | Over exploitation |
| 3. | Invasion of alien species | 4. | Co-extinctions |
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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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