Fill in the Blanks :
$(1)$ Hydrocarbon compounds are made from ........ and ....... .
$(2)$ ......... has a capacity to stop the flow of oxygen.
$(3)$ ........ is formed by attaching carbon monoxide with hemoglobin in blood.
Explain in short : Pollution of troposphere done by hydrocarbon.
Have you ever observed any water pollution in your area? What measures would you suggest to control it ?
How did the depletion of ozone layer has created in the atmosphere over the Antarctica Explain with reactions.
What do you mean by Biochemical Oxygen Demand $(BOD)$ ?