question_answer

The given graph represents the effect of sewage   a discharge on some important characteristics Peak Y of river. Select the correct option with respect to the peaks X and Y.

A)  Peak X-Sharp increase in BOD, disappearance of clean water organisms, Distance downstream Peak Y - Increase in dissolved oxygen, Sewage reappearance of clean water organisms added

B)  Peak X - Increase in dissolved oxygen, reappearance of clean water organisms, Peak Y - Sharp decline in dissolved oxygen, disappearance of clean water Organisms

C)  Peak X - Sharp increase in BOD, appearance of clean water organisms, Peak Y - Increase in dissolved oxygen, disappearance of clean water organisms 

D)  Peak X - Increased number of anaerobic bacteria, disappearance of clean water organisms,        Peak Y - Sharp decline in dissolved reappearance of clean water organisms