The statement that does not correctly define water pollution is (c) A change in pressure of the water bodies.
Explanation: Water pollution refers to the contamination of water bodies with harmful substances that can negatively impact aquatic life and water quality. A change in pressure, while it might affect certain aspects of the environment, is not considered pollution as it doesn’t necessarily involve the introduction of harmful contaminants.
Why other options are incorrect:
(a) The addition of undesirable substances to water-bodies:
This is the most common and accurate definition of water pollution. When harmful substances like chemicals, pollutants, or waste enter a water body, it constitutes pollution.
(b) The removal of desirable substances from water-bodies:
While removing certain beneficial substances from water bodies can disrupt the ecosystem, the term “water pollution” primarily refers to the addition of undesirable substances. Removing something desirable can negatively impact the water quality but is not technically considered pollution in the same way.
(d) A change in temperature of the water bodies:
While temperature changes can negatively affect aquatic life and lead to thermal pollution, this is a separate issue from the contamination with harmful substances. Thermal pollution is a form of water pollution but not the only one.