#Biochemical Oxygen Demand

(a) What is the difference between fog and smog? What are the causes of smog and its effects on human health? Write short note on any one of the latest technologies to eliminate smog to avoid atmospheric pollution. (b) What is the role of oxygen-demanding wastes in water pollution? How it can be prevented? (c) What is the biosphere? Write a note on the 'Energy Resources' available in the biosphere. (d) What are the different layers of the atmosphere? On what basis these layers are classified? In which layer 'Auroras' are formed and where do satellites orbit?

#cssnexus #Fog and Smog #Causes of Smog #Smog Tower