Question

expand bod and write it's significance

Answer 1

biological oxygen demand (BOD).

significance: The higher the BOD value, the greater the amount of organic matter or “food” available for oxygen consuming bacteria.

Answer 2

Answer:

$Biological$ $Oxygen$ $Demand$  $[BOD]$

Explanation:

It is defined as the biochemical oxygen($O^2$) demand of water is a measure of amount of free oxygen required by the bacteria & other micro-organism for biological oxidation of organic matter under aerobic conditions at 20∘c for period of 5 days.