Question 5 Distinguish between the following
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium
Class XI Biology Chapter - Structural Organisation in Animals Page 122
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a)prostomium
it is a small fleshy lobe which overhangs the mouth of an earthworm it helps the organisms push into the soil and is sensory in function
b)peristomium
the first body segment in the earthworm is called the peristomium.it surrounds the mouth opening
Septal nephridium
They are present on both sides of inter-segmental septa behind the 15thsegment and they open into the intestine.
Pharyngeal nephridium
They are present as three paired tufts in the fourth, fifth, and sixth segments.
it is a small fleshy lobe which overhangs the mouth of an earthworm it helps the organisms push into the soil and is sensory in function
b)peristomium
the first body segment in the earthworm is called the peristomium.it surrounds the mouth opening
Septal nephridium
They are present on both sides of inter-segmental septa behind the 15thsegment and they open into the intestine.
Pharyngeal nephridium
They are present as three paired tufts in the fourth, fifth, and sixth segments.
Answered by
2
(a)
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.
(b)
Septal nephridium
Pharyngeal nephridium
They are present on both sides of inter-segmental septa behind the 15th segment. They open into the intestines.
They are present as three paired tufts in the fourth, fifth, and sixth segments.
hope its helps
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.
(b)
Septal nephridium
Pharyngeal nephridium
They are present on both sides of inter-segmental septa behind the 15th segment. They open into the intestines.
They are present as three paired tufts in the fourth, fifth, and sixth segments.
hope its helps
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