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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
Subtopic: Importance of Biodiversity |
75%
Level 2: 60%+
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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 |
Subtopic: Loss of Biodiversity |
85%
Level 1: 80%+
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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 |
Subtopic: Loss of Biodiversity |
73%
Level 2: 60%+
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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 |
Subtopic: Loss of Biodiversity |
79%
Level 2: 60%+
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Which of the following species of tiger has not gone extinct?
| 1. | Bali | 2. | Javan |
| 3. | Caspian | 4. | Siberian |
Subtopic: Loss of Biodiversity |
89%
Level 1: 80%+
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Subtopic: Importance of Biodiversity |
82%
Level 1: 80%+
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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 |
Subtopic: Biodiversity Patterns |
79%
Level 2: 60%+
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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% |
Subtopic: Introduction & Types |
91%
Level 1: 80%+
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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 |
Subtopic: Introduction & Types |
55%
Level 3: 35%-60%
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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 |
Subtopic: Biodiversity Patterns |
94%
Level 1: 80%+
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