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Which of the following is NOT a threat to crop diversity?
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The Cartagena Protocol |
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Consumer preferences |
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Climate change |
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Population growth |
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Which of the following is likely to happen as a result of climate change?
Temperatures will likely stabilize by 2100.
Water scarcity will be intensified in many regions.
It is not possible to project changes since they will occur in the future.
Agricultural production will be negatively impacted in all places around the globe.
Increased heavy rainfall events in the springtime has caused soil erosion on a farmer’s land. Which strategy would you recommend to address this issue?
Access inputs from alternative sources
Increase application of synthetic fertilizers
Plant cover crops
Let the land rest unplanted
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- Which of the following is not true about Roundup Ready crops? - Genetic material from roundup ready crops has made it into other crops - The use of Roundup Ready crops has facilitated the evolution of herbicide resistance in weeds - The use of Roundup Ready crops leads to a higher concentration of chemicals in ecosystems -Roundup Ready crops always increase yieldAs scientists have developed more productive crop varieties, farmers have switched from growing many traditional varieties to new high-yield varieties. For example, in India, the 10,000 varieties of rice once grown have been reduced to 10 major ones for most of the rice crop. Why is this practice of reducing the varieties of a crop dangerous? Question options: It makes the overall crop more susceptible to pests and/or disease. It reduces the variety of crops available for human diets. it requires a larger investment than small farmers can make it could reduce or cause the extinction of some predatory insectsHow can soil erosion lead to desertification? It reduces the level of organic matter It promotes flooding that destroys vegetation It promotes salinization that destroys soil structure Which of the following is not a factor that may lead to urban sprawl? Pollution Immigration Overpopulation Which statement is NOT true about soil salinization? Soil dehydrates due to decrease in accumulation of water underground. Starts by attempting to wash the salts out of the topsoil by pumping more water. Results to the damage and killing of plants as saline water surrounds its deep roots. Which would most likely happen if too much nutrient entered a freshwater ecosystem? Algae will decrease, leaving few food resources, for fish. Nutrients would sink to the bottom, increasing soil deposition. Algae breakdown lowers dissolved oxygen, causing fish to suffocate.
- All of the following are reasons why tropical rain forests less likely to grow back as secondary growth forests after widespread deforestation (when compared to temperate forests) EXCEPT: Question 25 options: - All of the above are significant reasons why tropical rain forests may not grow back after widespread deforestation. The soil of tropical rain forests contains much less organic matter and nutrients compared to the soil of temperate forests. - The trees in tropical rain forests are largely responsible for returning water vapor back to the atmosphere through evapotranspiration, so when they are gone, the rains come less frequently. - A larger percentage of the nutrients in a tropical rain forest system are stored in the trees themselves than in temperate forests. - Almost all tropical rain forest species are wind-pollinated, which is less reliable than insect-pollination so tree reproduction is affected more by “chance.”Social inequality, violence, warfare, disease, overpopulation, environmental degradation, lower health and nutritional quality. These are some of the direct impacts of the development of agriculture. Given all the social and biological ills associated with the shift from being hunter-gatherers to agriculture, it has been said that agriculture is the “worst mistake in the history of the human race?” (https://www.discovermagazine.com/planet-earth/the-worst-mistake-in-the-history-of-the-human-race). Do you agree with this statement? Why or why not?Farming is often done on the large-scale to allow for high-volume production. For example, tomatoes can be grown in large open fields and harvested by machinery instead of by hand. The harvester machine not only collects (nearly) all the tomatoes, it also removes the green unripe fruits! Harvesters like this one greatly reduce the time needed to obtain crops but challenges remain. What is one biotic factor that could limit the tomato yield? List and briefly explain how this factor causes a yield decrease What is one strategy you could use to try and reduce losses from this biotic factor?
- What are the economic, environmental and/or biological implications of the following scenarios? Give specific examples. Plants are unable to produce secondary metabolites Loss of biodiversity Absence of government agencies responsible for conservation and sustainabilityYou are the head of an internationalgranting agency that assists farmers with soil conservationand sustainable agriculture. You have $10 million todisburse. Your agency’s staff has decided that the fundingshould go to:(1) farmers in an arid area of Africa prone to salinization,(2) farmers in a fast-growing area of Indonesia whereswidden agriculture is practiced,(3) farmers in Argentinapracticing no-till agriculture, and(4) farmers in a dryland area of Mongolia undergoing desertification.What types of projects would you recommend funding ineach of these areas, how would you apportionyour fundingamong them, and why?Purple loosestrife (Lythrum salicaria) and musk thistle (Carduus nutans) are ruderal plants that are invasive to Colorado. Both species can inhabit a range of habitats, but they grow especially well in high temperatures and moist soils. L. salicaria also harbors nitrogen-fixing bacteria in its roots. Suppose a researcher investigated the type of community interaction that these species have with each other, in nitrogen-poor and nitrogen-rich soils. The researcher grew the two species of plants in artificially constructed plots, as follows:• Treatment 1: L. salicaria in nitrogen-rich soil• Treatment 2: L. salicaria in nitrogen-poor soil• Treatment 3: C. nutans in nitrogen-rich soil• Treatment 4: C. nutans in nitrogen-poor soil• Treatment 5: L. salicaria and C. nutans in nitrogen-rich soil• Treatment 6: L. salicaria and C. nutans in nitrogen-poor soil Plots contained a total of 10 plants (either all 10 of one species, or five of one species and five of…
- Purple loosestrife (Lythrum salicaria) and musk thistle (Carduus nutans) are ruderal plants that are invasive to Colorado. Both species can inhabit a range of habitats, but they grow especially well in high temperatures and moist soils. L. salicaria also harbors nitrogen-fixing bacteria in its roots. Suppose a researcher investigated the type of community interaction that these species have with each other, in nitrogen-poor and nitrogen-rich soils. The researcher grew the two species of plants in artificially constructed plots, as follows:• Treatment 1: L. salicaria in nitrogen-rich soil• Treatment 2: L. salicaria in nitrogen-poor soil• Treatment 3: C. nutans in nitrogen-rich soil• Treatment 4: C. nutans in nitrogen-poor soil• Treatment 5: L. salicaria and C. nutans in nitrogen-rich soil• Treatment 6: L. salicaria and C. nutans in nitrogen-poor soil Plots contained a total of 10 plants (either all 10 of one species, or five of one species and five of…Purple loosestrife (Lythrum salicaria) and musk thistle (Carduus nutans) are ruderal plants that are invasive to Colorado. Both species can inhabit a range of habitats, but they grow especially well in high temperatures and moist soils. L. salicaria also harbors nitrogen-fixing bacteria in its roots. Suppose a researcher investigated the type of community interaction that these species have with each other, in nitrogen-poor and nitrogen-rich soils. The researcher grew the two species of plants in artificially constructed plots, as follows:• Treatment 1: L. salicaria in nitrogen-rich soil• Treatment 2: L. salicaria in nitrogen-poor soil• Treatment 3: C. nutans in nitrogen-rich soil• Treatment 4: C. nutans in nitrogen-poor soil• Treatment 5: L. salicaria and C. nutans in nitrogen-rich soil• Treatment 6: L. salicaria and C. nutans in nitrogen-poor soil Plots contained a total of 10 plants (either all 10 of one species, or five of one species and five of…Purple loosestrife (Lythrum salicaria) and musk thistle (Carduus nutans) are ruderal plants that are invasive to Colorado. Both species can inhabit a range of habitats, but they grow especially well in high temperatures and moist soils. L. salicaria also harbors nitrogen-fixing bacteria in its roots. Suppose a researcher investigated the type of community interaction that these species have with each other, in nitrogen-poor and nitrogen-rich soils. The researcher grew the two species of plants in artificially constructed plots, as follows:• Treatment 1: L. salicaria in nitrogen-rich soil• Treatment 2: L. salicaria in nitrogen-poor soil• Treatment 3: C. nutans in nitrogen-rich soil• Treatment 4: C. nutans in nitrogen-poor soil• Treatment 5: L. salicaria and C. nutans in nitrogen-rich soil• Treatment 6: L. salicaria and C. nutans in nitrogen-poor soil Plots contained a total of 10 plants (either all 10 of one species, or five of one species and five of…
