The term ecosystem was introduced by :
P.Odum
Tansley.
Maheswari.
Charles Elton.
The rate of biomass production is called :
Gross productivity.
Standing crop.
Productivity.
Assimilation.
The rate of energy storage at the consumer level is called :
Secondary productivity.
Net productivity.
Primary productivity.
Which Nitrogen fixing bacteria is present on the surface of roots of tropical grasses ?
Azospirillum.
Azotobacter.
Clostridium.
Pseudomonas.
