In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level ?
`"Grass"to"Grasshopper"to"Frog"to"Snake"to"Hawk"`

Options

A. 5kJ
B. 50 kJ
C. 500 kJ
D. 5,000 kJ

Answer

D

Explanation

According to 10% law, only 10% of energy is transferred to the next trophic level and remaining 90% energy is used in life processes by present trophic level. Due to this gradual decrease in energy, food chains contain only 3-4 trophic levels.

Therefore .
Energy available to Grass = 10% of 5000 kJ.
Energy available to Grasshopper = 10% of 500 kJ
Energy available to Frog = 10% of 50 kJ
Energy available to Hawk= 5 kJ