Q. No.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
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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Overexploitation is one of the “evil quartet” that increases the risk of extinction mainly for the:
1. animals that feed on a lower trophic level
2. large animals with low intrinsic reproductive rates
3. aquatic animals
4. terrestrial organisms
The biggest factor for the ‘biodiversity crisis' that we face today is:
1. Global warming
2. Environmental pollution
3. Habitat loss and fragmentation
4. A large and increasing human population
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Consider three sample areas with the following composition:
| Sample area I: | has three species of birds, two are represented by one individual each and the third by four individuals |
| Sample area II: | has three species of birds, each represented by two individuals |
| Sample area III: | has a species of insects, a species of mammals and a species of birds, each with two individuals |
Which area will be considered as the most diverse?
1. Sample area I
2. Sample area II
3. Sample area III
4. Sample area II and Sample area III are equally diverse
Regarding the gradients of biodiversity:
| I: | As we move from poles to the equator, broadly speaking, biodiversity decreases. |
| II: | There is an increase in species diversity from lower to higher altitudes. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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