32. How long have we had transgenic food crops?

Question

BlackTom AI · Accepted Answer

Question restatement: 32. How long have we had transgenic food crops?

Option-by-option analysis:

Option 1: "50 years". This is the best-supported choice among the options. The development of transgenic (GM) crops began in the 1970s–1980s, with the first commercialized GM crop appearing in the mid-1990s. Roughly five decades ago aligns reasonably with the timeline from foundational genetic engineering work to commercialization, making ~50 years a plausible duration for having transgenic food crops.

Option 2: "500 years". This is inaccurate because genetic engineering techniques used to create transgenic crops are modern developments that did not exist 500 years ago. Agricultural crops with wild-type genetics have existed for millennia, but transgenic modification itself is a 20th–21st century capability.

Option 3: "> 5000 years". This is clearly incorrect for the same reason as above: transgenic modification is not something that began thousands of years ago; the concept of modifying genes with targeted techniques is a modern scientific advancement.

Option 4: "5 years". This underestimates the timeline dramatically. The first transgenic crops were developed and approved for commercial cultivation in the 1990s, which is about 25–30 years ago, not 5. While some lab work occurred within a few decades, 5 years would be far too short to establish multiples of crops worldwide.

Overall, the reasoning hinges on distinguishing modern genetic engineering timelines from historical agriculture. Options 2 and 3 misplace the era entirely by centuries, option 4 underestimates by a large margin, and option 1 best matches the commonly accepted timeline for when transgenic food crops have existed in agriculture.

32. How long have we had transgenic food crops?单项选择题

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