Dyes and pigments are the main forms of colourant i.e.to provide colour to materials, whether they are textiles or paints.

While dyes are soluble in mediums like water, pigments a must be converted to a coarser powder after which it is mixed with a dispersing agent before application. Dyes do not scatter light and look transparent.Another difference is thatpigment particles are much larger in composition size.

Natural Drugs: The drugs, which are extracted from the plants, animals and their products are the natural drugs. Ayurvedic drugs are the natural drugs often utilize natural substances such as herbs, minerals, and animal products in their formulations. These natural drugs have been used for centuries in various cultures for their medicinal properties.

Drug addiction: Drug addiction is the negative condition when a person consumes drugs in an appropriate way. It occurs when a person continues to...

Antipyretic is a type of pharmacodynamic drug that can be consumed to lower the human body temperature. Example: paracetamol.

Analgesic is a type of pharmacodynamic drug that can be consumed to relieve pain without loss of consciousness. Example: aspirin.

a. Pesticides: The chemicals which are used to control or kill the pests are called pesticides. For example, DDT, BHC, alddrin, etc.

b. Insecticides: The chemicals which are used to kill the insects are called insecticides. Some insecticides are DDT ( Dichlorodiphenyl trichloroethane)

c. Fungicides: The chemicals which are used to control moulds & fungi are called fungicides. Some fungicides are CuSO₄solution, Aluminum phosphate (AIP).

d. Herbicides: The chemicals which are used to control...