Highest DDT deposition shall occur in
Phytoplankton
Sea gull / birds
Crab
Eel
Which one is not a pollutant normally?
Hydrocarbons
Carbon dioxide
Carbon monoxide
Sulphur dioxide
The most common indicator organism which represents polluted water is:
Escherichia coli
Salmonella typhi
Vibrio cholerae
Entamoeba histolytica
Which of the following pair is a sedimentary type of biogeochemical cycle?
Oxygen and nitrogen
Phosphorus and sulphur
Phosphorus and nitrogen
Phosphorus and carbon dioxide
The pyramid which cannot be inverted in a stable ecosystem is that of
Biomass
Number
Energy
All of these
Which of the following pair is correctly matched?
Uricotelism-aquatic habitat
Parasitism-intra-specific relationship
Excessive perspiration - xeric adaption
Stream lined body-aquatic adaptation
If the forest cover is reduced to half, what is most likely to happen on a long term basis ?
Tribals living in these areas will starve to death
Cattle in these and adjoining areas will die due to lack of fodder .
Large areas will become deserts.
Crop breeding programmes will suffer due to a reduced availability of variety of germplasm.
Pyramid of number deals with number of
Species in an area
Indivuals in a community
Individuals in a trophic level
Sub-species in a community
The nature of climax community ultimately depends on:
Climax
Bed rock
Soil organisms
Pool of available nutrients
Upper part of sea / aquatic ecosystem contains
Plankton
Nekton
Both (a) and ( b )
Benthos
