Since 2008, GMO crops have accounted for more than 80% of the corn and soybean crops planted in the U.S. Corn (maize)seeds are modified with two genes: one kills insects that eat the seed and one allows the seed to tolerate glyphosate,a herbicide commonly used in weed killers like Roundup.Soybeans are modified with just one glyphosate-resistant gene.Since 2008, scientists at the University of Virginia have been monitoring the effects of planting GMO corn and soybeans within farm ecosystems. The UVA study found evidence that both corn and soybean farmers have increased herbicide use during the last five years, and the scientists concluded that planting these GMO crops is having a negative impact on the local environment Why? Which choice does NOT provide a valid reason? A Increased herbicide use results in increased contamination of aquatic ecosystems. B Farmers resort to using additional chemicals as glyphosate-resistant weeds evolve. C The cultivation of GMO's led to a significant increase of yield compared to the non-GMO varieties. D Herbicides can have unintended consequences for nontarget plant species, thereby reducing plant biodiversity.

Question

Since 2008, GMO crops have accounted for more than 80% of the corn and soybean crops planted in the U.S. Corn (maize)seeds are modified with two genes: one kills insects that eat the seed and one allows the seed to tolerate glyphosate,a herbicide commonly used in weed killers like Roundup.Soybeans are modified with just one glyphosate-resistant gene.Since 2008, scientists at the University of Virginia have been monitoring the effects of planting GMO corn and soybeans within farm ecosystems. The UVA study found evidence that both corn and soybean farmers have increased herbicide use during the last five years, and the scientists concluded that planting these GMO crops is having a negative impact on the local environment Why? Which choice does NOT provide a valid reason? A Increased herbicide use results in increased contamination of aquatic ecosystems. B Farmers resort to using additional chemicals as glyphosate-resistant weeds evolve. C The cultivation of GMO's led to a significant increase of yield compared to the non-GMO varieties. D Herbicides can have unintended consequences for nontarget plant species, thereby reducing plant biodiversity.

Answer 1

The question asks for the choice that does NOT provide a valid reason for the negative impact of GMO crops on the local environment.Option A states that increased herbicide use results in increased contamination of aquatic ecosystems. This is a valid reason as it highlights the negative impact of GMO crops on the environment.Option B mentions that farmers resort to using additional chemicals as glyphosate-resistant weeds evolve. This is also a valid reason as it explains the negative impact of GMO crops on the environment.Option C claims that the cultivation of GMO's led to a significant increase of yield compared to the non-GMO varieties. This statement does not provide a reason for the negative impact of GMO crops on the local environment. Instead, it highlights a positive aspect of GMO crops, which is increased yield.Option D states that herbicides can have unintended consequences for nontarget plant species, thereby reducing plant biodiversity. This is a valid reason as it explains the negative impact of GMO crops on the environment.Therefore, the correct answer is option C, as it does not provide a valid reason for the negative impact of GMO crops on the local environment.

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