In an ecosystem, the amount of energy utilised by plants for respiration is 150 kJ, then find out NSP in secondary carnivores.

[Note: Energy utilised for respiration – 25 %] 

$\frac{\mathrm{x}}{4}=150$

$\mathrm{x}=150\times 4=600$

$\mathrm{x} = \mathrm{GPP}$

GPP = 600 kJ
NPP = 450 kJ
GPP – R = NPP

 Plants 450 kJ  $\to$Herbivores 45 kJ $\to$Primary carnivores - 4.5 kJ $\to$Secondary carnivores - 0.45 kJ

So, NSP is secondary carnivores is 0.45 kJ