Question

in an food chain trophic level 1 is occupied by Green plants give wreasons

Answer 1

this is because each and every living organism is directly or indirectly depended on plants......it provides food water and everything we need....

Answer 2

when we consider a food chain each tropic level represents energy level.
green plants are producers
the pyramid goes like
plants} primary consumers}sec. consumers}tert. consumers.
plants produce and thus are the in tropic chain