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State the difference between the first trophic levels of detritus food chain and grazing food chain.

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In detritus food chain the detrivores and decomposers constitute the first trophic level whereas in grazing food chain the producers i.e. the autotrophic living green and photosynthetic plants constitute the first trophic level.

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S. No First trophic level of detritus food chain First trophic level of grazing food chain
(i) Decomposers are at the first trophic level. Producers are at the first trophic level
(ii) They break down the complex organic matter into simpler form by secreting enzymes They prepare complex organic molecules from simple inorganic material with the help of sun light.

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S. No.




 		 First trophic level of detritus food chain


 		 First trophic level of grazing food chain
 
(i)



 		 Decomposers are the first trophic level.

 		 Producers are the first trophic level.
(ii)










 		 They break down the complex organic matter into simpler form by secreting enzymes.



 		 They prepare complex organic molecules from simple inorganic material with the help of sunlight.

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