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
1. Commensalism
2. Mutualism
3. Parasitism
4. Amensalism
The principle of competitive exclusion was stated by?
1. C. Darwin
2. G. F. Gause
3. MacArthur
4. Verhulst and Pearl
Mycorrhizae are the example of:
1. Amensalism
2. Antibiosis
3. Mutualism
4. Fungistasis
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 |
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. |
What type of human population is represented by the following age pyramid?