why in a singled celled organisms there is not specific organ for intake of food exchange of gases and removal of wastes?
Answers
Single cell organisms
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A unicellular organism, also known as a single-celled organism, is an organism that consists of only one cell, unlike a multicellular organism that consists of more than one cell
Example
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Euglena, green algae, as well as any prokaryotic organism such as most bacteria.
Why do they don't need special organs
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Because there entire surface of the organisms is in contact with the environment, so they don't need special organs.
Their degestion process
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Some single-celled organisms, such as protista, sequester food particles in food vacuoles, where enzymes break them down. Simple multicellular organisms, such as hydra and flatworms, have one-opening digestive systems. ... Roundworms have the simplest two-opening digestive system, which is little more than a tube
Their excretion process
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Single-celled organisms, such as amoebas and paramecium as well asbacteria, yeasts, and the cells of your body, all excrete molecular waste through a process called exocytosis.
Their exchange of gases
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Single-celled organisms are aquatic and their cell surface membrane has a sufficiently large surface area to volume ratio to act as an efficient gas exchange surface. ... In small and thinorganisms, the distance from gas exchange surface to the inside of theorganism is short enough for diffusion of gases to be efficient.