Q. No.Migratory birds like Siberian cranes are facing threats of extinction mainly due to:
1. pesticides
2. fragmentation or loss of habitat
3. urbanization
4. bad weather
1. pesticides
2. fragmentation or loss of habitat
3. urbanization
4. bad weather
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The peregrine falcon in the United States got extinct due to:
| 1. | loss of habitat | 2. | pesticides |
| 3. | loss of food supply | 4. | predation |
The most recorded extinctions during the past 500 years have occurred among:
1. flowering plants
2. mammals
3. birds
4. amphibians
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The species that are vulnerable to extinction do not include the species that:
1. have high genetic variability
2. are hunted or harvested by people
3. have a declining population size
4. are local endemic species
The current extinction is called a ‘biodiversity crisis’ because:
1. the extinctions are not a natural phenomenon
2. the rates are high and is due to the human activities
3. the extinction is mainly affecting animals rather than plants
4. only keystone species are being lost
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An endangered species as compared to a threatened species:
1. is nearer to extinction
2. threatens the survival of other species
3. is one about which the known data is deficient
4. has more diversity
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Apex predators also commonly act as:
| 1. | Keystone species | 2. | Tertiary consumers |
| 3. | Endemic species | 4. | Ecospecies |
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The most serious negative impact of loss of biodiversity on humans would be due to:
1. global warming and ozone depletion.
2. loss of ecosystem services.
3. loss of source of genetic diversity to preserve endangered species.
4. loss of species for ʺbioprospecting.ʺ
Habitat loss and fragmentation lead to loss of biodiversity primarily because:
| 1. | less plants in fragmented habitats leads to less photosynthesis. |
| 2. | more soil erosion takes place in fragmented habitats. |
| 3. | smaller populations in fragmented habitats are more prone to extinction. |
| 4. | animals migrate out of smaller habitat fragments. |
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Exotic alien introduced species can become invasive in the introduced ecosystem due to:
I. preying on native species.
II. out-competing native species for food, light, and breeding habitat.
III. lack of natural predators.
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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