Chapter 10 study guide - Corn staple grain of world food...

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Corn - staple grain of world food supply - many varieties exist today because of early selective crop breeding Oaxaco, Mexico -noted for its many varieties of corn (maize). Important to preserve these varieties for future of agriculture. Genetically engineered crops - to grow crops that have desirable traits such as fast growth and disease resistance. Genes are extracted from one organism andinjected into DNA of the other. US grows many genetically modified crops. Advantage - improved crop performance, more food to reduce starvation Controversy - many believe that transgenes from these crops could contaminate native crops. In Mexico - do not grow genetically modified corn, but have found some native cornhad traces of DNA from gentically modified corn. Probably from corn brought in from US Food production has increased faster than world population by: devoting more energy (fuels) to agriculture planting and harvesting more frequently, increasing use of pesticides, fertilizer and irrigation increasing amount of cultivated land developing better crops and livestock through crossbreeding and genetic engineering Reasons why many in the world do not get food is because of political obstacles rather than lack of supply. Food production increased - but grain crops have decreased grain crops are staple foods in the world We may eventually see a decline in agriculture because land is being used up and soil is declining Green revolution - 20 th century desire to increase worldwide food production led to advances in agriculture to grow more crops on less land Norman Borlaug - Nobel Prize winner - developed strain of wheat that grew fast and resisted disease. Led to selective breeding of other crops. New grains and improved agriculture methods were brought to developing parts of the world
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Chapter 10 study guide - Corn staple grain of world food...

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