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Earth System Science

Unit 7 study guide

QuestionAnswer
Integrated pest management (IPM), is an approach under which farmers consider each crop and pest problem as a whole and design a targeted program drawing on multiple control technologies True
One-third of global food harvests come from irrigated areas. True
Biofuels produce fewer atmospheric pollutants and greenhouse gases than fossil-based fuels when they are combusted. True
The Green Revolution was a 30-year transformation of agriculture in developing regions True
Rachel Carson’s 1962 book Silent Spring drew wide-scale public attention to the environmental effects of pesticides. True
__________ is defined as the ratio of harvested biomass to total biomass. Harvest index
Which of the following are examples of organochlorine pesticides? DDT, Aldrin, Dieldrin, Heptachlor
Planting large holdings of one or a few crop varieties that have been developed for high yields is referred to as _________. Monoculture
Which of the following are some possible environmental damages caused by irrigation? all of these answers
The product that can be harvested from an agricultural system, which is called its ______, represents a loss of materials such as water and nutrients from the system. Yield
Agriculture is the primary livelihood for 40 percent of the human population. True
World food production has kept up with rapid population growth and dramatic gains have occurred especially in the past 50 years. True
Most of the plant's water intake passes upward through the plant from roots to leaves and is lost to the atmosphere as water vapor through pores in the leaf surface called _________. Stomata
During photosynthesis, plants use energy from sunlight to convert carbon dioxide (CO2) and water into __________. Carbohydrates
__________ is the biggest limit on agricultural productivity. Drought
Transpiration is the movement of ________ from soil to the atmosphere through the bodies of plants. Water
Artificial agricultural ecosystems such as Monocultures are vulnerable to outbreaks of pests and pathogens and are typically nutrient-rich. True
Large-scale agriculture has increased global biodiversity. False
World food production has kept up with rapid population growth and dramatic gains have occurred especially in the past 50 years. True
On average, only about 3.5 percent of Earth’s surface is suitable for agriculture without any physical constraints. True
Which of the following are basic limits to how much of Earth’s surface can be used for agriculture? All of these answers
Created by: 1385962727
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