NUTRITION ALC+MASTW/MDA W/ET AC PKG
4th Edition
ISBN: 9780135158999
Author: Blake
Publisher: PEARSON
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Chapter 12, Problem 4TF
Summary Introduction
To examine: Whether the statement “Most of the corn grown in the United States is used to feed animals, not humans” is true or false.
Introduction: A farm is an area of land where foods and crops are produced. Animal farming is used to raise animals for food. In the United States, the dominant food animals are cows, pigs, and chickens.
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NUTRITION ALC+MASTW/MDA W/ET AC PKG
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- Figure 31.10 Farmers often rotate corn (a cereal crop) and soy beans (a legume) planting a field with each crop in alternate seasons. What advantage might this crop rotation confer?arrow_forwardFigure 46.8 Why do you think the value for gross productivity of the primary producers is the same as the value for totall heat and respiration (20,810 kcal/ m2/yr)?arrow_forwardPlants use carbon dioxide from the air and are therefore called _____________. consumers producers decomposer carbon fixersarrow_forward
- The movement of mineral nutrients through organisms and their environment is called a __________cycle. biological bioaccumulation biogeochemical biochemicalarrow_forwardWhy are drinking water supplies still a major concern for many countries?arrow_forwardEnergy Efficiency of Biofuel Production Most of the plant material currently used for biofuel production consists of food cropsmainly corn, soybeans, and sugarcane. In 2006, David Tilman and his colleagues published the results of a 10-year study comparing the net energy output of various biofuels. The researchers grew a mixture of native perennial grasses without irrigation, fertilizer, pesticides, or herbicides, in sandy soil that was so depleted by intensive agriculture that it had been abandoned. They measured the usable energy in biofuels made from the grasses, and also from com and soy, then measured the energy it look to grow and produce biofuel from each kind of crop (Figure 6.1). FIGURE 6.1 Energy input and output of biofuels made from three different crops. One hectare is about 2.5 acres. About how much energy did ethanol produced from one hectare of corn yield? How much energy did it take to grow the corn to make that ethanol?arrow_forward
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