Glyphosate is the active ingredient in herbicide formulations containing it. Corn and soybeans are resistant to the effect of the herbicide glyphosate. It sells a VMAX soybean that is resistant to glyphosate herbicide. Chemical control via the use of a systemic herbicide, such as glyphosate. Glyphosate is the most widely used herbicide in the United States. The term applies to various pesticides such as insecticide, fungicide, herbicide and nematocide. These same problems occur in agriculture with pesticide and herbicide resistance. As an herbicide, paraquat acts by inhibiting photosynthesis. Atrazine is an herbicide of the triazine class. Most commercialised GMOs are insect resistant or herbicide tolerant crop plants. Atrazine is a herbicide of the triazine class. RNAi has been used to target weeds that tolerate Monsanto's Roundup herbicide. Paraquat is classified as a non-selective contact herbicide. All substances listed are insecticides, except for 2,4-D, which is an herbicide. She committed suicide using the herbicide paraquat in 2007.