Question

why a single celled organisms does not need specific organs for taking in food, exchange of gases or removel of waste.

Answer 1

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.

Answer 2

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.

How do unicellular organisms exchange gases uptake food or remove wastes from their body?

• Diffusion is a very slow process.
• If multicellular organisms used diffusion to meet all requirements of food, exchange of gases or removal of wastes it would take too much of time for carrying even a single particle in the body of the organism and hence diffusion is a process only for unicellular organisms.

How do single-celled organisms exchange substances?

• A simple, unicellular organism (consisting of one cell) can rely on diffusion to move substances into and out of the cell.
• Its surface area is large compared to its volume , so nutrients and other substances can pass quickly through the membrane and around its 'body'.

Can a single cell take in food and other nutrients?

• Cells can incorporate nutrients by phagocytosis.
• This amoeba, a single-celled organism, acquires energy by engulfing nutrients in the form of a yeast cell (red).
• Through a process called phagocytosis, the amoeba encloses the yeast cell with its membrane and draws it inside.

How do unicellular organisms exchange gases uptake food or remove wastes from their body?

• Diffusion is a very slow process.
• If multicellular organisms used diffusion to meet all requirements of food, exchange of gases or removal of wastes it would take too much of time for carrying even a single particle in the body of the organism and hence diffusion is a process only for unicellular organisms.

Hence, Because the entire surface of the organism is in contact with the environment, single-celled organisms do not require specific organs for food intake, gas exchange, or waste elimination.

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