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Q. Given flowchart represents grazing and detritus food chain.
Grazing food chain: Grass $\rightarrow$ Rabbit $\rightarrow$ Lion
Detritus food chain: Dead leaves $\rightarrow$ Wood louse $\rightarrow$Black bird
The organisms which constitute the first trophic level of the grazing food chain and the detritus food chain are respectively,

Ecosystem

Solution:

In grazing food chain, green plants (producers) constitute the first trophic level. In detritus food chain, wood louse constitutes the first trophic level.