Respiration: There is no definite structure for respiration in Amoeba. Theyrespire
through aerobic process. In absence of any definite organ, there respiration is
accomplished by the plasmalema. 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 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 collectedand
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.
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