QS Study

There is no definite structure for respiration in Amoeba. They respire through the aerobic process. In absence of any definite organ, their respiration is accomplished by the plasmalemma. Respiratory work mainly occurs through diffusion. The amount of dissolved oxygen of water where Amoeba lives is higher than the oxygen content of cytoplasm. As a result, oxygen can easily enter the body of Amoeba by the diffusion process.

Oxygen is required for respiration. To meet this requirement diffusion continuously occurs in the body of Amoeba. Carbon dioxide produced due to chemical reaction is eliminated from the body in the same manner. This process can easily happen as the amount of carbon dioxide is more in the cytoplasm of Amoeba than in the water.


Excretion: The process by which the nitrogenous waste materials are collected and removed from the animal body is called excretion. The excretory material of Amoeba is mainly ammonia. In dissolved condition, these excretory materials are discharged outside through the plasmalema by the process of diffusion.