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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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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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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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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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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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% |
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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 |
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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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The biodiversity hotspots in India include all the following except:
1. | Western Ghats and Sri Lanka | 2. | Indo-Burma |
3. | Himalayas | 4. | Deccan plateau |
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