detritus --> earthworm --> frog --> snake. It represents 
1)detritus food chain 
2)saprophytic food chain
3)predator food chain
4)both 1 and 2

It represent Detritus food chain ( also known as Saprophytic food chain ) !

 Hence the answer would be (4) 

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3) predator food chain
 
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It is predator food chain only.
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even I wrote the option 4, but they said it's only option 1. I'm confused!!!
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well in NC​ERT , only Detritus food chain is given not saprophytic food chain !

but if you go through some standard reference books, you'd get to know, saprophytic food chain is an alternate name of Detritus food chain !

so answer must be (4) yaar :3

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