Components of Air

Match the list -I and the list -II and select the correct answer using the codes given below the lists : {:(,"List-I",,"List-II"),(A.,"Ozone gas",1.,"Combines with haemoglobin"),(B.,"Nitrous oxide",2.,"Ultraviolet radiation"),(C.,"Carbon dioxide",3.,"Component of air in small quantity"),(D.,"Carbon monoxide",4.,"Visible radiation"),(,,5.,"Infrared radiation"):}

The active component of air is __________.

The component of air used by green plants to make their food, is _________

Lichens are sensitive to which component of air pollution.

Name the component of air which extinguishes fire . Give reasons.