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Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYStructural Organisation in Animals2 Marks
Question
Distinguish between the followings: Prostomium and peristomium.
✓

Answer

Prostomium
Peristomium
Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function.
The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening.

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