Which of the following factors help to measure the quality of water?

Explanation

This option is correct because all three factors - DO, BOD, and COD - are important parameters used to evaluate water quality. They provide complementary information about different aspects of water pollution and its impact on aquatic environments.Now we'll look at why other options are incorrect.(a) DO (Dissolved Oxygen): Dissolved oxygen is a crucial parameter in assessing water quality. It measures the amount of oxygen dissolved in water, which is essential for the survival of aquatic organisms. Low levels of dissolved oxygen can indicate pollution or other factors affecting water quality, such as excessive organic matter decomposition.(b) BOD (Biochemical Oxygen Demand): BOD is a measure of the amount of dissolved oxygen consumed by microorganisms while decomposing organic matter in water. It provides an indication of the amount of organic pollution present in water. High BOD levels suggest high levels of organic pollutants, which can lead to oxygen depletion and harm aquatic life.(c) COD (Chemical Oxygen Demand): COD is another measure of the amount of oxygen required to chemically oxidize organic and inorganic matter in water. It provides information about the overall pollution level in water, including both biodegradable and non-biodegradable substances. High COD levels indicate high levels of pollution, which can have adverse effects on aquatic ecosystems and human health.(Environmental chemistry,Solid Waste Management and Water Treatment)