A biome is
  • Sum of all ecosystems on the Earth
  • Biotic components in a population
  • Sum of ecosystems in a geographical area
  • Biotic components in an ecosystem
The important steps in the process of decomposition are
  • Fragmentation and mineralisation
  • Leaching and catabolism
  • Humification and mineralisation
  • All of the above
Ecosystem is
  • Open
  • Close
  • Both open and close
  • Neither opened nor closed
Biosphere means
  • Atmosphere, lithosphere and hydrosphere
  • Lithosphere and ionosphere
  • Hydrosphere, lithosphere and ionosphere
  • Atmosphere
Germplasm conservation at liquid N2 temperature is
  • Stratification
  • Cryopreservation
  • Scarification
  • None of the above
The decomposition of organic matter is brought about by
  • Protozoans
  • Plants
  • Microorganisms
  • None of the above
Secondary productivity is the rate of formation of new organic matter by
  • Decomposer
  • Consumer
  • Producer
  • Parasite
The boundary or transition between two or more communities is called:
  • Ecotype
  • Thermocline
  • Ecotone
  • Biome
Detritivores break down the detritus by the process called
  • Mineralisation
  • Humification
  • Leaching
  • Fragmentation
The biomass available for consumption to heterotrophs and the rate of formation of new organic matter by consumers are defined as
  • Net primary productivity and gross primary productivity, respectively.
  • Gross primary productivity and net primary productivity, respectively.
  • Gross primary productivity and secondary productivity, respectively.
  • Net primary productivity and secondary productivity, respectively.
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