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Excretory Products and their Elimination

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Describe the excretory organs in protozoans, sponges and coelentrates.

Protozoans : Protozoans have no excretory organs. The metabolic waste products i.e. ammonia is passed out by diffusion through the cell membrane in surrounding water. They carry out the process of excretion with the help of contractile vacuoles.

Sponges : Ammonia is the main excretory product in sponges. It diffuses from cells into the water filling the canals and surrounding the sponge. From the canal system, the waste matter is carried away by the outgoing current of water. 

Coelentrates : Coelentrates have no excretory organs. They pass out metabolic waste by diffusion from all cells. They are ammonotelic i.e. their excretory product is ammonia. The waste water entering coelentron leaves when its water is renewed.


 What is uremia ?

Uremia is the accumulation of urea in the blood due to the malfunctioning of the kidneys. The urea accumulation is harmful and may lead to kidney failure. 


What is Bowman's capsule?

The double walled cup like structure present at the starting of the renal tubule is Bowman's capsule. It encloses the glomerulus capsule. 

What is glomerulonephritis ?

Glomerulonephritis is the inflammation of glomeruli of the kidney. 

Name three uricotelic animals.

The uricotelic animals are
1. Birds
2. Reptiles
3. Insects


What is the ultimate method for the correction of acute renal failure?

Kidney transplant.