AP BIOLOGY

Detailed explanation-1: -In unicellular organisms, since they do not have any specialized organs for the removal of waste materials, their wastes are removed directly through the cell membrane by the process of diffusion.

Detailed explanation-2: -Final answer: In many unicellular organisms, waste products are removed by the process of diffusion.

Detailed explanation-3: -In unicellular (single-celled) organisms, diffusion across the cell membrane is sufficient for supplying oxygen to the cell. Diffusion is a slow, passive transport process. In order to be a feasible means of providing oxygen to the cell, the rate of oxygen uptake must match the rate of diffusion across the membrane.

Detailed explanation-4: -The unicellular organisms remove excretory products by the process of simple diffusion. The process of elimination of excretory products is complex in multicellular organisms, so they have special organs like kidneys, ureter, urethra, urinary bladder etc to perform the same function.

Detailed explanation-5: -A single-celled organisms does not need specific organs for taking in food, exchange of gases or removal of wastes because the entire surface of the organism is in contact with the environment. Thus tha exchange of gases can take place by simple diffusion and there is no need of special organs.