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  • Read the following statements.  The excretory system

Read the following statements.

  1.  The excretory system of earthworm consists of segmentally arranged coiled tubes called nephridia.
  2. A nephridium starts as a funnel which  collects excess fluid from coelomic chamber.
  3. The nephridia are of two types i.e. pharyngeal nephridia and septal nephridia.
  4. Nephridiopores are minute openings present in anterior and posterior parts to act as mouth and anus.

Choose the option with incorrect statements

Option: 1

I and II

 


Option: 2

II and III

 


Option: 3

III and IV

 


Option: 4

I and IV


Answers (1)

best_answer

 Excretory system of Earthworm

  • The excretory system of earthworm consists of segmentally arranged coiled tubes called nephridia.
  • The major function of nephridia is to regulate the volume and composition of body fluids. 
  • A nephridium starts as a funnel that collects excess fluid from the coelomic chamber.
  • The tubular part of the nephridium delivers the wastes through a pore to the surface of the body wall into the digestive tube.
  • The nephridia are of three types i.e. pharyngeal nephridia, integumentary nephridia and septal nephridia
  • Pharyngeal nephridia
  • It is present as three paired tufts in the 4th, 5th and 6th segments on either side of the pharynx and esophagus.
  • They open into the buccal cavity and pharynx.


Integumentary nephridia 

  • These are V-shaped nephridia attached to the lining of the body wall of segment 3 to the last which open to the outside through nephridiopores 
  • These nephridiopores are minute openings present on the body surface. 

Septal nephridia

  • These are the largest nephridia in earthworms.
  • These are arranged along the sides of the intersegmental septum from the 15th segment onwards.
  • These open into the intestines.

 

- The nephridia are of three types. Nephridiopores do not act as mouth and anus. They have separate openings.

Posted by

Shailly goel

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