Function of stomodeal valve in the gut of cockroach is to prevent the entry of food from: a) pre oral cavity b) gizzard into midgut c) hindgut to midgut d) midgut into gizzard

The correct option is b).
The stomodeal valve is a sphincter muscle present just behind the proventriculus that regulates the flow of food from the gizzard into midgut.

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