Which of the following findings, if true, would support an argument in favor of gm foods? a. farmers using herbicide-resistant crops pollute groundwater more than farmers growing non-gm crops. b. farmers who grow gm crops have much higher yields that farmers growing unmodified crops. c. the cost of using gm crops is prohibitively expensive for 75 percent of all farmers. d. the populations of bees on farms growing insect-resistant crops are half as large as bee populations on other farms.

Option B, Farmers who grow GM crops have much higher yields that farmers growing unmodified crops.

Explanation:

An arguments in support of GM crops must show the positive effect of the genetic modification for any of the parameter involved in crop production such as yield, dependency on artificial fertilizer, attack of insecticide or pesticide, genetic diversity , etc. Here all except option B are outlining the negativities associated with GM crops.

Genetically modified crops are less resistant to diseases and also the hybrid seeds have high productivity rate due to which the annual yield escalates.

Hence, option B

"do a testcross with a homozygous recessive plant."

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