The sulphate rocks are formed in ocean by leaching of:
A.FeS and Fe2S3
B.Organic sulphates and -SH
C.Soluble inorganic sulphates
D.All of these
Category: Ecology and General Silviculture Mcqs
The greatest biomass of autotrophs in the world’s oceans is that of:
A.Benthic brown algae, coastal red algae and dephnids
B.Benthic diatoms and marine viruses
C.Sea-grasses and slime-moulds
D.Free-floating microalgae, cyanobacteria and nanoplankton
The pyramid of number in a forest ecosystem is:
A.Rhombiodal
B.Upright
C.Inverted
D.Linear
The number of individuals of a species in a particular ecosystem at a given constant due to:
A.Man
B.Parasites
C.Predators
D.Available food
Which is the most stable ecosystem?
A.Desert
B.Ocean
C.Mountain
D.Forest
The ecological pyramids were first designed by:
A.Clements
B.Kormondy
C.Warming
D.Elton
In a comparative study of grassland ecosystem and pond ecosystem it may be observed that:
A.Primary and secondary consumers are similar
B.Both biotic and abiotic components are different
C.The biotic components are almost similar
D.The abiotic components are almost similar
In a stabilized ecosystem the P/R ratio is:
A.One
B.Less than one
C.More than one
D.Any of these
Mark the correct statement with reference to phosphorous cycle:
A.Inorganic phosphates are lost by leaching
B.Ocean phosphates are lost by sedimentation
C.Soluble phosphates are lost by erosion
D.Soil has plenty of dissolved phosphates
If we completely remove the decomposers from an ecosysters, its functioning will be adversely affected because:
A.Herbivores will not receive solar energy
B.Rate of decomposition of other component will be very high
C.Mineral movement will be blocked
D.Energy flow will be blocked
