Question

Describe the excretory system

Answer 1

Excretory system is the organ system of our body which helps in removing waste from our body . It has three main parts - kidneys, urinary bladder and anus. Kidneys filter the urine and urine is stored at the bladder and when the bladder gets filled urine is released through the anus.

Answer 2

                                      Excretory System

→ The process of elimination of metabolic wastes from the body is called excretion.

→ Removal of excess of water from the body or keep water content constant is called osmoregulation.

→ Depending on the type of waste, nitrogen elimination is of three types

         

(i) Ammonotelism is the elimination of nitrogen mainly in the form of ammonia , eg, aquatic invertebrates, bony fish and amphibians.

(ii) Ureotelism is the removal of nitrogen mainly as urea. Ammonia combine with Co2, in liver to form urea, e.g., mammals, man, frog, toads.

(iii) Uricotelism is the elimination of nitrogen mainly as uric acid, e.g., birds, reptiles, and many insect.

→ Uric acid is commercially extracted from bird droppings.

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