Question

why do single celled organisms with cell walls do not have contractile vacuoles

Answer 1

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Contractile vacuoles are membrane-bound organelles that pump water out of the cell. ... They are mainly found in protists or other species that are single-celled and lacking a cell wall, and they protect the cell against taking in too much water and rupturing.

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Answer 2

Single celled organism do not contactile vacuoles

Explanation:

• In certain organisms, usually single-celled organisms lacking a cell wall, there exists a special kind of vacuole, called a contractile vacuole.
• A contractile vacuole works just the same as the name suggests, in that it expands and contracts. The point of the contractile vacuole is to pump water out of the cell through a process called osmoregulation, the regulation of osmotic pressure. It occurs in freshwater protists, but mainly in the kingdom Protista as a whole.

• There needs to be a set amount of solute vs. solvent in the cell. Basically, the solvent (water) needs to be in balance with the solute (other material). Since the cell works by osmosis, water moving across a semi-permeable membrane, water moves to a lower concentration of water and a higher concentration of solute.
• If there is too much water, the contractile vacuole works to pump out the water.
• This helps to protect the cell: if there is too much water in the cell, it will swell and swell until eventually it ruptures, destroying the cell.
• The function of cell wall in unicellular organisms is to provide protection to the inner cell membrane in addition to providing rigidity to the organism.
• Example: In bacteria, cell wall is made up of peptidoglycan for giving structural support to the bacteria.