Choice OnlineTest9(ch8)
Multiple Identify the choice that best completes the statement or answers the question.
B
1. Since 1970, the number of people suffering from malnutrition worldwide a. fell from about 1 billion to about 500 million. b. fell from about 920 million to about 850 million. c. stayed the same. d. rose from 900 million to 1 billion. e. varied by only a few millions. 2. Anemia can be the result of a deficiency in a. cobalt. b. iodine. c. iron. d. calcium. e. potassium. 3. About ____ of the world's people eat meat, and one-half of the world's cropland is used to produce livestock feed. a. one-fifth b. one-fourth c. one-third d. one-half e. three-fourths 4. Which of the following is characteristic of subsistence farming? a. human labor and draft animals b. monoculture c. feedlots to raise many animals in a small space d. massive amounts of fossil fuel during cultivation and harvesting e. industrialized agriculture 5. Intercropping involves growing a. several varieties of one crop on a plot of land. b. two or more different crops on a plot of land. c. trees and crops together. d. crops in alternate rows. e. crops in rotations each year. 6. The United States has already lost about ____ of the original topsoil of the cropland in the Great Plains. a. one-tenth b. one-sixth c. one-fifth
C
C
A
B
D
d. one-third e. two-thirds
D
7. Irrigation may lead to a. increased yield. b. decreased yield. c. salinization. d. all of these answers. e. a and c only. 8. Conservation tillage reduces a. labor costs. b. amount of erosion. c. water loss from the soil. d. all of these answers. e. none of these answers. 9. The first green revolution included a. increasing the intensity and frequency of cropping. b. increasing the use of fertilizer and pesticides. c. developing and planting high-yield crop varieties. d. all of these answers. e. none of these answers. 10. Genetic research of the second green revolution produced ____ specially bred for tropical and subtropical climates. a. sugarcane and pineapples b. rice and wheat c. corn and potatoes d. bananas and coconuts e. tomatoes and olives 11. Much of the grain we produce is used to feed livestock. of Which the following types of animals needs the least amount of grain per kilogram of body weight and is thus more efficient? a. beef cattle b. pigs c. chicken d. fish e. they are all about the same 12. Cattle and dairy cows are responsible for producing around 16% of the world's annual emissions of which greenhouse gas? a. carbon dioxide b. nitrogen dioxide c. carbon monoxide
B
D
B
D
E
d. chlorofluorocarbon e. methane
C
13. Aquaculture supplies ____ of the world's commercial fish harvest. a. 13% b. 23% c. 33% d. 43% e. 53% 14. Problems with aquaculture include a. destruction of mangrove forests. b. loss of fish through pesticide poisoning. c. waste contamination of nearby surface water and groundwater. d. dense populations being prone to disease. e. all of these answers. 15. Governments often provide assistance to farmers because farmers have little control over a. weather. b. crop prices. c. crop pests. d. disease. e. all of these answers. 16. An important source of protein in South Africa is Mopani, which is what type of insect? a. black ant b. emperor moth caterpillar c. giant waterbug d. butterfly e. dung beetle 17. According to the U.S. Department of Agriculture (USDA), no more than ____ of the insecticides applied to crops by aerial spraying reach the target pests. a. 2% b. 12% c. 22% d. 32% e. 42% 18. Biological control a. is faster acting than pesticides. b. has saved farmers an average of $25 for each $1 invested. c. maximizes development of genetic resistance by pest species. d. is easier to apply than pesticides.
E
E
B
A
B
e. is expensive and easy.
C
19. A pheromone is a. a new form of chemical insecticide waiting approval by FIFRA. b. a strong herbicide. c. a species-specific chemical sex attractant. d. a chemical that travels in the bloodstream and controls an organism's growth and development. e. a safe, natural pesticide. 20. Sustainable agriculture is characterized by all of the following except a. promoting monoculture. b. lack of need of massive amounts of fossil fuels. c. conserving and building topsoil. d. increasing use of organic fertilizers. e. all of these answers apply to sustainable agriculture.
A