Biochemical Oxygen Demand (BOD) of water

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remains unchanged with the planktonic algal growth.

is directly proportional to the amount of dissolved oxygen.

gives a measure of non-biodegradable matter.

indicates the amount of organic pollutants in water.

answer is D.

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Detailed Solution

BOD is high in polluted waters. It is possible to estimate the amount of biodegradable organic matter in sewage water by measuring Biochemical Oxygen Demand (BOD). Micro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. BOD is inversely proportional to DO. Presence of large amounts of nutrients in waters also causes excessive growth of planktonic (free-floating) algae, called an algal bloom. BOD is high in waters with algal growth.

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