Q. No.
| 1. | when N nears the carrying capacity of the habitat |
| 2. | when N/K equals zero |
| 3. | when the death rate is greater than the birth rate |
| 4. | when N/K is exactly one |
An association of individuals of different species living in the same habitat and having functional interactions is known as:
| 1. | Ecological niche | 2. | Biotic community |
| 3. | Ecosystem | 4. | Population |
In which of the following interactions both partners are adversely affected?
| 1. | Competition | 2. | Predation |
| 3. | Parasitism | 4. | Mutualism |
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that:
| 1. | both plant populations in this habitat decreased |
| 2. | population-B competed more successfully for food than population-A |
| 3. | population-A produced more offspring than population-B |
| 4. | population-A consumed the members of population-B |
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is:
| 1. | 15 | 2. | 05 |
| 3. | zero | 4. | 10 |
According to Darwin, organic evolution is due to:
| 1. | Interspecific competition. |
| 2. | Competition within closely related species. |
| 3. | Reduced feeding efficiency in one species due to the presence of interfering species. |
| 4. | Intraspecific competition. |
The principle of competitive exclusion was stated by?
1. C. Darwin
2. G. F. Gause
3. MacArthur
4. Verhulst and Pearl
1. Commensalism
2. Mutualism
3. Parasitism
4. Amensalism
If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to:
| 1. | mutualism | 2. | amensalism |
| 3. | commensalism | 4. | parasitism |
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