Explain- prostomium is sensory in function in earthworm.

Please find below the solution to the asked query

Prostomium is a small lip or tongue like lobe present on the upper side of mouth. It helps the earthworm to push into the soil and is sensory in function.
The dorsal surface of prostomium contains photoreceptor cells which help them to detect the intensity and duration of light. Hence, prostomium serves sensory function.

Hope this information will clear your doubts about the earthworm.

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