Botany Ecosystem questions from NEET UG 2014.
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks. 
If 20J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain? plant $\rightarrow$ mice $\rightarrow$ snake $\rightarrow$ peacock