Question

In the following food chain, grass provide 4000 J of energy to the grasshopper. 

Grass, Grasshopper, Frogs, Snakes 

How much energy will be available to snakes and frogs?

Answer 1

Grass ----> Grasshopper -------> Frogs -------> Snakes

(4000 J)        (400 J)                   (40 J)              (4 J)

So, for snakes and frogs, 4 J and 40 J energy will be available by 10% law respectively.