Net primary productivity is utilised by

Match List-$I$ with List-$II$ :

List-$I$ (Process)	List-$II$ (Definition)
$A$. Productivity	$I$. Gross primary productivity minus respiration losses
$B$. Net primary productivity	$II$. Rate of formation of new organic matter by consumers
$C$. Gross primary productivity	$III$. Rate of biomass production
$D$. Secondary productivity	$IV$. Rate of production of organic matter during photosynthesis

Choose the correct answer from the options given below:

The gross primary productivity of the ocean in billion tonnes is:

Approximately $.............$ of the Earth's surface is covered by oceans,yet the productivity of the oceans is only $...............$.

The annual net primary productivity of the whole biosphere is approximately $...........$ (dry weight) of organic matter.

The idea of the productivity of an ecosystem can be obtained from: