Answer:
See the answer below
Explanation:
The contractile vacuole primarily functions for the excretion of excess water in organisms that possess the organelle. Paramecia that lives in freshwater would need to constantly get rid of excess water that is likely to be entering the cell due to the fact that the ambient water is hypotonic to their cells. The cytosols of paramecia that live in freshwater have a higher solute concentration and hence, lower water potential than the surrounding freshwater.
The paramecia that live in salt water do not have a need for the contractile vacuole because the problem of excess water entering their cells may not arise. The salt water may not be hypotonic to the cytosol of the paramecia.
Paramecia are single-celled eukaryotic organisms, which are found in aquatic habitats. They are long and slipper-shaped organisms, which have many membrane-bound cell organelles.
The paramecium is the protists, which are found in the marine habitat. The organisms are eukaryotic and have well-developed cell organelles.
The presence of contractile vacuoles in the paramecium regulates the osmoregulation and discharge of excess water. The contractile vacuole controls the intracellular water balance by discharging or accumulating excess water.
The saline water has a high concentration of salt, whereas the freshwater does not have salty compounds.
Thus, the paramecium in saline water has contractile vacuoles to regulate osmoregulation.
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