GMO (Genetically Modified Organism) crops have taken their way in to the globe because of the evolution of Recent Advances in Biotechnology. They pose serious threat to our environment and consumers. They are evolved with the help of Genetic Engineering, which includes the incorporation of genes from any bacterium (Bacillus thureingenesis) in to the host plant. These genes are target specific and are mostly against the pests. When the plant grows these genes are expressed, and if any pest feeds on this plant, due to water loss and many other biochemical reactions mortality takes place.
This website gives you a detailed information about organic foods and its scientific evidences.