Biological equilibrium is an equilibrium among the
Producers
Producers and consumers
Decomposers and producers
Producers, consumers and decomposers
Grazing food chain
The number of individuals of a species in a particular ecosystem at a given time remains constant due to
$A$ : In secondary productivity, no new organic matter is formed.
$R$ : It is only utilisation of part of food manufactured by primary producers in building of consumer biomass.
The snakes are included under
The total energy fixed by a gram plant (Cicer arietinum) in an ecosystem on the whole is called