Praying mantis is a good example of
1. mullerianmimicary.
2. warning colouration.
3. social insect
4. camouflage.

Graph below is a diagrammatic representation of response of organisms to biotic factors. What do a,b,c represent respectively?


1. Partial regulator, conformer, regulator
2. Regulator, conformer, Partial regulator
3. Conformer, regulator, Partial, regulator
4. Regulator, Partial conformer, regulator

What type of human population is represented by the following age pyramid?

1. Expanding population
2. Vanishing population
3. Stable population
4. Declining population

Cuscuta is an example of
1. predation.
2. endoparasitism.
3. ectoparasitism.
4. brood parasitism.

A sedentary sea anemone gets attached to the sheel lining of hermit crab. The association is
1. ectoparasitism
2. symbiosis.
3. commensalism.
4. amensalism.

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.

When does the growth rate of a population following the logistic model equal zero? The logistic model is given
As dN/dt=rN(1─N/K)
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 death rate is greater than birth rate.

Which of the following is correct for r-selected species?
1. Large number of progeny with large size.
2. Small number of progeny with small size.
3. Small number of progeny with large size.
4. Large number of progeny with small size.

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. amensalism.
2. commensalism.
3. parasitism.
4. mutualism.

Mycorrhiza are the example of
1. Amensalism.
2. Antibiosis.
3. Mutualism.
4. Fungistasis.