NEET 2021 Model Test Paper 4

How many statements are correct ?
(a) In an aquatic ecosystem, grazing food chain is major conduits for energy flow
(b) Detritus food chain may be connected with grazing food chain at some level
(c) Each tropic level has a certain mass of living materials at a particular time called as standing crop
(d) Species composition and stratification are two main structural features of an ecosystem