ESFINALQ7 – Flashcard
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________% of the food we consume comes from ________ crop species.
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90; 15
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Factors involved in soil formation are ________.
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weathering of parent material, freezing/thawing, tree roots
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Which process not only controls erosion, but can also help to replenish soil nutrients?
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crop rotation
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Industrial agriculture ________.
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increased our ability to obtain more food from the same area
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Over time, pesticides become less effective. This is because __________.
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pests can evolve defenses against pesticides
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Leaching ________.
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removes water-soluble nutrients from soils
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Based on the information in the figure, you decide to make changes in your diet to diminish your ecological footprint (the environmental impact of your food choices) by ________.
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shifting your protein intake from beef and pork to eggs and dairy products
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Relative to sustainable agriculture, insects' roles are as ________.
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essential pollinators and predators
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Swidden agriculture is necessary in rainforests for all of the following reasons EXCEPT __________.
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the soil of rainforests is not suitable for forest growth
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To make organic fertilizer by composting, you do not include ________.
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shredded plastic and metals, waste from animal butchering
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All of the following practices are used to control soil erosion EXCEPT __________.
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industrial monoculture agriculture
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Humus is ________.
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composed of organic matter and is necessary to fertility and holding soil moisture
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We lose 5 to 7 million ha of productive cropland per year to ________.
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erosion, over-irrigation, and overgrazing
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Erosion usually begins when __________.
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vegetation is removed either naturally or by humans
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Of the following, ________ best describes integrated pest management (IPM).
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biocontrol measures, crop rotation, and habitat diversification
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Seed banks (institutions that store and preserve seeds) are important for ________.
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protecting genetic diversity
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Monoculture ________.
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is an agricultural practice of growing large stands of a single species
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In regard to energy efficiency, aquaculture is __________.
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incredibly energy-efficient compared to harvesting fish from open waters
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During the past half-century, global food production has ________ world population growth.
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grown at a faster rate than
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Which of the following soil horizons is most severely affected by erosion?
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A
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The comparison shown in the figure is environmentally significant because ________.
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production of beef and pork is resource-intensive
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The O horizon of soils consists of ________.
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mostly organic material
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The consequences of over-fertilizing include ________.
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eutrophication and dead zones in nearby aquatic ecosystems
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The Conservation Reserve Program pays farmers to ________.
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stop cultivating highly erodible land
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The loss of more than 10% productivity in an arid area due to erosion, soil compaction, deforestation or overgrazing is ________.
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desertification
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Terracing, contour farming, intercropping, and crop rotation all ________.
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are techniques for conserving soil resources and fertility
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We will be able to support more people with the same amount of food supply if most people eat which of the following types of diet?
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a vegetarian diet
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Desertification of soil __________.
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can be caused by overgrazing
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The use of biocontrol runs the risk of __________.
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the control agent negatively impacting other species besides the species needing to be controlled
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Aquaculture ________.
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can bring economic benefits and food security to many developing regions
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Recombinant DNA ________.
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is the merging of DNA from unrelated organisms to create new genetic varieties
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Over-irrigation can result in ________.
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soil salinization and waterlogging
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Green Revolution techniques ________.
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have increased crop yields but may not be sustainable
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Which of the following are farms that concentrate on raising large numbers of animals of all the same type in a small area?
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feedlots
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Researchers have demonstrated that organic farming ________.
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decreased organic soil losses while giving yields comparable to conventional farming
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Until about 10,000 years ago, our species depended on ________.
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hunting and gathering
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Monoculture, the practice of planting large areas with a single crop ________.
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is a development of industrial agriculture
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Bt crops ________.
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have been given a bacterial gene that gives chemical protection against pests
