Geometric representation of age structure is a characteristic of:
1. Biotic community
2. Population
3. Landscape
4. Ecosystem
A high density of elephant population in an area can result in:
1. Mutualism
2. Intraspecific competition
3. Interspecific competition
4. Predation on one another
Praying mantis is a good example of:
1. mullerian mimicry
2. warning colouration
3. social insects
4. camouflage
The formula for exponential population growth is :-
1. dt/dN = rN
2. dN/rN = dt
3. rN/dN = dt
4. dN/dt = rN
Annual migration does not occur in the case of:
1. Salmon
2. Siberian crane
3. Salamander
4. Arctic tern
The population dynamics of a species is basically regulated by
1. Climate
2. Food supply
3. Competition between and within the species
4. All of the above
In a lake that undergoes thermal stratification, blooms of phytoplankton tend to occur
1. before thermal stratification
2. after thermal stratification
3. at the onset of thermal stratification
4. at the mid-phase of thermal stratification
Commensalism is an association of two species in which
1. one lives, attached to the other, without harming it
2. both organisms derive benefits from each other
3. one derives its nutrition from the other
4. none of the above
Some students, during a study, caught, marked and released 80 fishes in a pond. Later
100 fishes were caught at random. Among these 40 were found to be marked. What is
the approximate number of fishes in the pond?
1. 50
2. 100
3. 200
4. 4000
The sphere of living matter together with water, air and soil on the surface of earth is
called
1. atmosphere
2. hydrosphere
3. lithosphere
4. biosphere