Q. No.At present, the most important cause driving animals and plants to extinction is:
1.
Co-extinctions
2.
Alien species invasions
3.
Over-exploitation
4.
Habitat loss and fragmentation
Amongst the vertebrates, the Class with maximum number of species is:
| 1. | Pisces | 2. | Reptilia |
| 3. | Aves | 4. | Mammalia |
Identify the correct fact regarding the biodiversity hot spots in the world:
| 1. | The current total number is 25 and 3 of these cover India |
| 2. | The current total number is 25 and 2 of these cover India |
| 3. | The current total number is 34 and 3 of these cover India |
| 4. | The current total number is 34 and 2 of these cover India |
If we consider invertebrates, the maximum global biodiversity, after insects, is seen in:
| 1. | Crustaceans | 2. | Echinoderms |
| 3. | Mollusks | 4. | Annelids |
Consider the two statements:
| I: | Species diversity seen in tropical areas is much lower than that seen in temperate areas. |
| II: | Temperate areas, unlike tropical areas are less seasonal, more constant and promote niche specialization. |
1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct but II is incorrect.
4. Both I and II are incorrect.
All the following describe a stable biological community except:
| 1. | It should always show a significant increase in productivity from year to year |
| 2. | It must be either resilient or resistant to occasional natural disturbances |
| 3. | It must be either resilient or resistant to occasional man-made disturbances |
| 4. | It must be resistant to invasion by alien species |
Lantana camara and Clarias gariepinus are examples of:
| 1. | Invasive species | 2. | Apex predators |
| 3. | Critical link species | 4. | Edge species |
The name of Alexander von Humboldt is associated with the concept of:
| 1. | Increased species diversity in stable communities |
| 2. | Parallelism between evolution and ecological succession |
| 3. | Resource-partitioning to avoid competition |
| 4. | Species-Area relationship |
Which of the following is not an ex-situ method for conservation of biodiversity?
| 1. | Seed banks | 2. | Zoological parks |
| 3. | Sacred groves | 4. | Cryopreservation of gametes |
In a co-evolved highly specific plant-pollinator obligatory mutualism, if one of the members gets extinct, the other most likely:
| 1. | would increase in number but the diversity in the population would reduce |
| 2. | would increase in number and the diversity in the population would increase |
| 3. | would decrease in number and the diversity in the population would reduce |
| 4. | also go extinct |
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