Explanation

PAR – Photosynthetically Active Radiation. The sum is the only source of energy for all ecosystems on earth. Out of the total incident solar radiation, only 50% of it is photosynthetically Active Radiation (PAR) Plantscapture only 2-10% of the PAR and this small amount of energy sustains the entire living world. So, there is unidirectional flow of energy from the sun to producers and then to consumer