Q. No.Consider the following statements:
I:
When certain exotic species are introduced into a geographical area, they become invasive because the invaded land does not have its natural predators.
II:
Competition is best defined as a process in which the fitness of one species is significantly lower in the presence of another species.
III:
Biological control methods adopted in agricultural pest control are based on the ability of the predator to regulate the prey population.
Which of the above statements are true?
1.
I and II only
2.
I and III only
3.
II and III only
4.
I, II, and III
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All the following are the reasons for the increase in the population of present-day India except:
1. An increasing birth rate
2. A rapidly declining death rate
3. Decreasing maternal mortality rate
4. Decreasing infant mortality rate
As a mechanism of defense against herbivory, Calotropis:
1. Has a large number of thorns
2. Secretes cardiac glycosides
3. Produces a neurotoxin, strychnine
4. Releases a hallucinogen
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A feature of ‘r’ strategists would be:
| 1. | few offspring | 2. | little parental care |
| 3. | sigmoid growth curves | 4. | a longer generation time |
The maximum population size of the species that the environment can sustain indefinitely is called as:
| 1. | biotic potential | 2. | natality |
| 3. | environmental resistance | 4. | carrying capacity |
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A community of living organisms in conjunction with the nonliving components of their environment, interacting as a system is termed:
| 1. | ecosystem | 2. | species |
| 3. | biome | 4. | population |
The threat of extinction will be highest for:
| 1. | a very small population in an unstable environment |
| 2. | a moderate-sized population of r strategists |
| 3. | a large population with lots of genetic variabilities |
| 4. | a moderate sized population in a stable environment |
The growth rate of a natural population equals zero:
| 1. | when N/K is exactly one |
| 2. | when N nears the carrying capacity of the habitat |
| 3. | when N/K equals zero |
| 4. | when mortality is greater than natality |
The growth of a population is unlikely to be limited by:
| 1. | predation | 2. | harsh weather |
| 3. | disease | 4. | an abundance of natural resources |
Identify the correct statements about symbiotic relationships:
| I: | in a parasitic relationship, one organism is harmed and the other is benefited. |
| II: | coevolution is a feature of many symbiotic relationships. |
| III: | a relationship that appears to be commensalism may in fact be mutualistic or parasitic. |
| IV: | the most efficient type of parasite is one that kills its host. |
| 1. | I, II and III only | 2. | I, III and IV only |
| 3. | II, III and IV only | 4. | I, II, III and IV |
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