TS PSC Group 1 Services Prelims 2014 Paper

Consider the following statements :
I. Chlorofluro carbons have been widely used as super coolants in aerosols and insecticides.
II. Methoprene is harmful to plants and animals.
III. Photobacterium phosphorus is an example of bioluminescence.
IV. Pedology is the study of soil in the natural atmosphere.
Find the correct statements