NEET BIOLOGY

Detailed explanation-1: -The amount of oxygen required by microorganisms to decompose the biodegradable organics is called Biological Oxygen Demand or Biochemical oxygen demand (BOD). A low BOD is an indicator of good quality water, while a high BOD indicates polluted water.

Detailed explanation-2: -Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature.

Detailed explanation-3: -BOD is defined as the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down the organic material present in a water sample, at a specific temperature and specified period.

Detailed explanation-4: -They require a minimum level of oxygen for growth, about 1%–10%, well below the 21% found in the atmosphere.

Detailed explanation-5: -The amount of oxygen required to break down the organic material in a volume of water at a certain time and temperature is referred to as the biochemical oxygen demand (BOD).