Question

Why trophic level are limited in ecosystem

Answer 1

due to energy transfer, energy available to top tropical level is very very low so trophic levels are limited in food chain

Answer 2

tropic levels were limited because by 10 percent law and by this only 10 percent of energy will be  available to the next tropic level and thus after four or five tropic levels the energy becomes almost negligible and thus tropic levels do not exceed a maximum more than 5