Question

how is waste excreted in amoebas

Answer 1

Specific excretory organs are absent in unicellular organisms like amoeba. These organisms remove waste products by simple diffusion from the body surface into the surrounding water. Amoeba possess osmo-regulatory organelle called contractile vacuole. This collects water and waste from the body,swells up,reaches the surface and bursts to release its content to outside. The main excretion takes place through body surface by the process of osmosis. Thus,waste products are exceed in amoeba.