In an ecosystem, the insectivorous plants are placed in

Greater primary productivity depends upon

Secondary productivity is rate of formation ofnew organic matter by

$A$ : 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.

In the phosphorus cycle, phosphate becomes available by weathering of rocks first to

First link in any food chain is a green plant because