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Excretory organs of animals
Concepts tested here
- Nephridia of earthworm
All Questions
2010 AIPMT-MAINS 1 question
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In which one of the following organisms are its excretory organs correctly stated?The excretory organs of the earthworm are segmentally arranged coiled tubules called nephridia, of three types: septal nephridia (on both sides of the intersegmental septa from segment 15 to the last), integumentary nephridia (attached to the lining of the body wall from segment 3 to the last) and pharyngeal nephridia (three paired tufts in segments 4, 5 and 6). This statement is correct.
In humans the kidneys are the main excretory organs; sweat glands, lungs and liver also help, and sebaceous glands eliminate some waxes and sterols, but tear glands are not excretory.
In the cockroach excretion is by Malpighian tubules (with fat body, nephrocytes and urecose glands); the enteric (hepatic) caeca secrete digestive juice.
In the frog the kidneys are excretory; the skin and buccal epithelium are respiratory surfaces.
Hence the excretory organs are correctly stated for the earthworm.