Question

5. Distinguish between the followings
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium​

Answer 1

Answer:

(A)

Prostomium :                                                          

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.

Peristomium :

The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening.

(B)

Septal nephridium :

They are present on both sides of intersegmental septa behind the 15th segment and they open into the intestine.

Pharyngeal nephridium :

They are present as three paired tufts in the fourth, fifth, and sixth segments.

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