According to the passage, why do scientists value the variety of potatoes?
The potato was first domesticated in the Andes thousands of years ago, and farmers there still grow thousands of different varieties. They come in many shapes and colours, and each is suited to a particular altitude, soil or use. Some resist frost, others tolerate drought, and a few are kept only for special dishes. Scientists value this variety because a single disease can destroy a crop made of one type, while a mixed field is more likely to survive. In Lima, the International Potato Center stores and studies these varieties so that their useful traits are not lost.
Answer and explanation
Correct answer: A. A mixed crop is more likely to survive a single disease
- Step 1: The text says a disease can destroy a one-type crop while a mixed field is more likely to survive.
- Step 2: That is the stated reason.
Answer
A mixed crop is more likely to survive a single disease.
Why not the others: The passage says varieties differ in use and altitude, and says nothing about farmer numbers.
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