___ are substances which kill and repel insects.
Insecticides are substances which kill and repel insects. The most commonly used insecticides are: (i) Nicotine, Sulphur, DDT, Malathion, Parathion. (ii) Carbon disulphide, Calcium Cyanide, Methyl bromide.
Substances which are repelled by the external magnetic field are called:
Which of the following substances are repelled by magnetic field?