Following is a contact poison -: (A) BHC, (B) BaSO4, (C) A + B of above, (D) Paris green
Answer is A. Insecticides are substances used to kill insects.They are 3 gruops: contact poison,stomach poison,fumigants. Contact poisons- BHC,DDT,lindanediazinon,malathion,fenthion. Stomach paoisons are paris green and sodium flouride . Fumigants are hydrogencyanide,methyl bromide,sulpher dioxide. Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 783