Monoculture means that all of a certain crop or species of plant are made up of the exact same DNA. This can be beneficial to farmers, since it means that their crops will all likely be ready to be harvested at about the same time, or it can be terrible for farmers, since a bacteria or other substance that is bad for one plant can instead kill an entire field of crops.
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Asteroids offer a source of volatiles and an extraordinarily rich supply of minerals that can be exploited for the exploration and colonization of our solar system in the twenty-first century. Asteroids represent the bits and pieces left over from the process that formed the inner planets, including Earth.