If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?

The correct option is A 0.02 J
The ten percent law is applicable to this food chain as well which is the transfer of energy from one trophic level to the next.According to this law, during one transfer of energy from organic food from one trophic level to the next, only about ten percent of the energy from the organic matter is stored as flesh. The remaining is lost during transfer, broken down in respiration or lost to incomplete digestion by higher trophic levels.In this food chain, the plant absorbs 100% energy which is 20J. If we consider a four-level food chain, then the energy transfer will be as follows:
Producer level = 20 J (100%)
Primary consumer = 20 J × 10% = 2 J (10%)
Secondary consumer = 2 J × 10% = 0.2 J (1%)
Tertiary consumer = 0.2 J × 10% = 0.02 J (0.1%)
Therefore, 0.02 J of energy will be available to the peacock (Tertiary consumer).