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Biological Oxygen Demand - Effect on Water Bodies
Addition of biodegradable matter exerts demand on oxygen of the water body. The demand of oxygen is directly related to increasing loads of organic matter and is expressed as biological oxygen demand (BOD).
It is the measure of dissolved oxygen required by aerobic decomposers to break down organic matter present in a given volume of water over 5-day incubation period at 20°C. It is expressed in parts per million or mg of oxygen per litre. A high value of BOD indicates the high activity of aerobic decomposers which in turn means more organic wastes or sewage in water.
Growing roots from different parts of plants Secure a box of sand and place it away from direct sunlight. Wet the sand thoroughly and keep it moist. Plant the following thi
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what is the excretory organ in protozoa?
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Problem-solving essay. Maximum 800 words. Deadline 12th of March. Show me you understand what this essay requires
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