Q43 / 200 · NEET 2007 · Botany

In which one of the following the BOD (biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent $(\mathrm{PE})$ and sugar mill effluent (SE) have been arranged in ascending order?

  • A
    SE $ < $ PE $ < $ S $ < $ DE
  • B
    PE $ < $ S $ < $ SE $ < $ DE
  • Correct answer
    C
    S $ < $ DE $ < $ PE $ < $ SE
  • D
    $\mathrm{SE} < \mathrm{S} < \mathrm{PE} < \mathrm{DE}$

Solution

BOD depends on the organic matter present in the effluent. More value of BOD means the water sample is polluted by organic matter. The ascending order of $\mathrm{BOD}$ in the given effluents is as follows: Sugar mill effluent $>$ Paper mill effluent > Distillery effluent $>$ Sewage

Hence, the correct answer is option: 'C'.

Relevant Questions