In which condition , the gene ratio remains constant for any species?
Sexual selection
Random mating
Mutation
Gane flow
Which type of association is found in between entamophilous flower and pollinating agent ?
Mutualism
Commensalism
Cooperation
Co-evolution
In which one of the following, the BOD (Biochemical Oxygen Demand) of Sewage (S), Distillery Effluent (DE), Paper mill Effluent ( PE) and Sugar mill Effluent (SE) have been arranged in ascending order ?
SE< S < PE < DE
SE < PE < S < DE
PE < S < SE < DE
S < DE < PE < SE
Phenomenon of ' Industrial melanism ' demonstrates
reproductive isolation
induced mutation
natural selection
geographical isolation
A species is considered as:
Artificial concept of human mind which cannot be defined in absolute terms .
Real units of classification devised by taxonomists .
Real basic units of classification
The lowest units of classification
Green-house effect refers to
production of cereals
cooling of earth
trapping of UV rays
warming of earth
Quercus species are the dominant component in:
Temperate deciduous forests
Alpine forests
Scrub forests
Tropical rain forests
Which of the following is absent in polluted water?
Hydrilla
Water hyacinth
Larva of stone fly
Blue-green algae
What is the intensity of sound in normal conversation ?
10-20dB
30-60dB
70-90dB
120-150dB
Niche overlap indicates:
Active cooperation between two species.
Two different parasites on the same host.
Sharing of one or more resources between the two species.
Mutualism between two species.
