Antihistamine drugs fall into two groups-those that block H 1 receptors and act mainly on blood vessels, and those that block H 2 receptors and act mainly on the secretion of acid in the stomach.
Biotechnology. Biotechnology, or genetic engineering, is the process of using living organisms to improve qualities of a plant by such as the plantâs ability to protect itself against damage or improving upon its ability to grow and produce.t allows for the transfer of one, or a few genes that can introduce traits such as better insect and weed control. Biotechnology at Monsanto Biotechnology is just one component of Monsantoâs three-pronged approach to delivering increased yields sustainably.
Examples of these techniques include: recombinant DNA techniques (r DNA or genetic engineering), tissue culture and mutagenesis.   Traditional Biotechnology   Traditional biotechnology refers to a number of ancient ways of using living organisms to make new products or modify existing ones.In its broadest definition, traditional biotechnology can be traced back to human's transition from hunter-gatherer to farmer.xamples of Modern biotechnology are tissue culture, genetic engineering, recombinant DNA techniques, mutagenesis, drugs, antibiotics, monoclonol antibodies, antipyretics, analgesics, breeding, cloning etc.