题目内容
One of the objectives for developing plants based on GM organisms is to improve crop protection. The GM crops currently on the market are mainly aimed at an increased level of crop protection through the introduction of ____________ against plant diseases caused by insects or viruses or through increased tolerance towards herbicides.
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Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis (Bt). This toxin is currently used as a conventional _____________ in agriculture and is safe for human consumption.
Herbicide ____________ is achieved through the introduction of a gene from a bacterium conveying resistance to some herbicides. In situations where weed pressure is high, the use of such crops has resulted in a reduction in the quantity of the herbicides used.
Monsanto developed Roundup, a glyphosate-based ___________ in the 1970s, and became a major producer of genetically engineered crops.
In 2017, global area of biotech crops was ________ million hectares.
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