Question

Which of the following organismal functions does NOT contribute to the fact that NPP is always lower than GPP?

	A.	Movement
	B.	Synthesizing cellulose
	C.	Maintaining ionic gradients
	D.	Replacing worn out proteins
	E.	Burning sugars in mitochondria to generate ATP

Answer 1

GPP ( Growth Primary Productivity) is defined as the amount of organic compound synthesized by producer per unit area.

NPP( Net Primary Productivity) is defined as the amount of GPP remains after the respiration loss.

In respiration, organic compounds are oxidised to produce ATP. Hence all the process in which ATP is utilised is the reason for lowering of NPP than GPP.

In movement, maintain ion gradient, replacing worn out protein require ATP. Similarly burning sugars in mitochondria also generate ATP.

But there is no requirement of ATP during synthesis of cellulose.  

That's why right option is B.