An association of individuals of different species living in the same habitat and having functional interactions is
1. Ecological niche
2. Biotic community
In which of the following interactions both partners are adversely affected?
The following graph depicts changes in two populations (A and B) of herbivores in grassy field. A possible reason for these changes is that
Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:
1. Western Ghat
3. Corbett National Park
4. Keoladeo National Park
A sedentary sea anemone gets attached to the shell lining of a hermit crab. The association is :
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 :
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
Cuscuta is an example of :
1. Brood parasitism
1. (I) and (III)
2. (II) and (IV)
3. (I) and (II)
4. (III) and (IV)
What type of human population is represented by the following age pyramid?
1. Stable population
2. Declining population
3. Expanding population
4. Vanishing population