Q. No.Identify the incorrect statement regarding population interactions:
1.
An orchid growing as an epiphyte on a mango branch is an example of commensalism.
2.
A given fig species can only be pollinated by its partner wasp.
3.
Biological pest control methods are largely based on predation.
4.
Most parasites do not harm or reduce the fitness of their hosts.
Resource partitioning is:
| 1. | Competitive exclusion results in the success of the superior species. |
| 2. | Slight variations in niches allow similar species to coexist. |
| 3. | Two species can coevolve to share the same niche. |
| 4. | Differential resource utilization results in a decrease in species diversity |
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Consider the given two statements:
| I: | Parasitoidism is the strategy that is closer to predation than parasitism. |
| II: | Parasitoids feed on a living host which they eventually kill, typically before it can produce offspring |
| 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 and II is incorrect. |
| 4. | Both I and II are incorrect. |
Ultimately the size of a population in a given area is determined by:
| 1. | the biotic potential |
| 2. | mortality rates and natality rates |
| 3. | carrying capacity of its environment |
| 4. | rate of immigration and emigration |
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Populations and species of larger size are found in colder environments, while populations and species of smaller size are found in warmer regions. This is:
| 1. | Allen’s rule | 2. | Hesse’s rule |
| 3. | Allee effect | 4. | Bergman’s rule |
Consider the two statements:
| I: | Predators in nature are ‘prudent’. |
| II: | Prey species have evolved defenses to lessen the impact of predation. |
| 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. | Only I is correct. |
| 4. | Both I and II are incorrect. |
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The sum of the environmental factors that tend to restrict the biotic potential of an organism is called environmental resistance. In the logistic growth equation dN/dt = rN[K-N/K], the environmental resistance is represented by:
| 1. | r | 2. | N |
| 3. | K | 4. | [K-N]/K |
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The distribution of a species is found to expand dramatically when the competitive superior species is removed from the area. This is called as:
| 1. | Competitive exclusion | 2. | Competitive release |
| 3. | Interference competition | 4. | Exploitative competition |
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An endoparasite in the human alimentary canal is expected to possess:
| I: | Well-developed locomotion |
| II: | A means to protect itself against the digestive juices of humans |
| III: | A high reproductive capacity |
| 1. | Only II | 2. | Only I and II |
| 3. | Only II and III | 4. | I, II and III |
An apex predator feeding on five different species is experimentally removed. The expected effect on the area will be:
| 1. | An increase in the number of all the five species |
| 2. | A decrease in the biodiversity |
| 3. | One of the five species becomes the apex predator |
| 4. | All five species die |
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