STEVE PERCIVAL / SCIENCE PHOTO LIBRARY STEVE PERCIVAL / SCIENCE PHOTO LIBRARY
GM soya beans. Conceptual image of genetically modified (GM) soya beans with a syringe. GM soya (Glycine max) has had a gene altered in the laboratory to make it resistant to chemical herbicides. This means that farmers can spray entire crops with herbicide to kill weeds, but the soya continues to grow, theoretically increasing yields. There is concern over the safety of GM foods, as well as the possibility of contamination of non-GM crops. Soya beans are a good source of dietary protein, vitamins and minerals. They can be prepared in a variety of ways, for example tofu, and are used in many processed foods.
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