Environmental Science Toughest Questions! Trivia Quiz

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  • 1/90 Questions

    Public lands (parks, zoos, national forests, national seashores, etc.) help sustain biodiversity.

    • True.
    • False.
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About This Quiz


Are you prepared for this environmental science most challenging questions quiz? You should be mindful of inland wetlands being valuable, the tragedy of the commons, what percentage of urban transportation is by car, which type of forest soil works in which areas of land, what would Good Wilderness Management do, by what is hydrologic cycle driven. If you want to understand more about environmental science, this is the quiz for you.

Environmental Science Toughest Questions! Trivia Quiz - Quiz

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  • 2. 

    As in a human body, the Earth's capacity to repair itself is critical to its survival.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    The statement suggests that the Earth's ability to heal and regenerate is crucial for its continued existence, similar to how the human body relies on its capacity to repair itself. This implies that if the Earth's natural systems and processes are disrupted or damaged beyond repair, it could have severe consequences for the planet's survival. Therefore, the answer is true.

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  • 3. 

    The declining economic health of cities often reduces services to their residents: water, electricity, open spaces, timely garbage collection, etc.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    The explanation for the correct answer, which is True, is that when cities experience a decline in their economic health, it often leads to a reduction in essential services provided to their residents. This can include services such as water, electricity, open spaces, and timely garbage collection. The decline in economic health can result in budget cuts and a lack of resources, making it difficult for cities to maintain and provide these services effectively. As a result, residents may experience a decrease in the quality and availability of these essential services.

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  • 4. 

    Man's ability to expand into new habitats increases man's population growth but does so at the expense of the environment. 

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    The statement suggests that when humans expand into new habitats, it leads to an increase in their population growth. However, this expansion comes at the cost of the environment. This means that as humans occupy new areas, they may disrupt ecosystems, deplete natural resources, and contribute to pollution and habitat destruction. Consequently, while human population may grow, it can have negative impacts on the environment.

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  • 5. 

    The size of a species' population, be that animal or human, is influenced by births, deaths, immigration, and emigration.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    The statement correctly explains that the size of a species' population is influenced by births, deaths, immigration, and emigration. This means that the number of individuals in a population can increase through births and immigration, while it can decrease through deaths and emigration. Therefore, the statement is true.

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  • 6. 

    Urban areas are attracting more and more residents, partly because of the hope for employment.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    The statement suggests that urban areas are becoming increasingly attractive to residents due to the potential for employment opportunities. This implies that people are moving to urban areas in search of better job prospects, which supports the statement being true.

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  • 7. 

    Home gardeners customarily use organic fertilizers more than commercial farmers do because of their high cost per pound of actual nutrient element.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    Home gardeners typically use organic fertilizers more than commercial farmers because organic fertilizers are generally more expensive per pound of actual nutrient element. This is because organic fertilizers are derived from natural sources, such as compost or animal manure, which require more time and resources to produce compared to synthetic fertilizers used by commercial farmers. Additionally, commercial farmers often have larger-scale operations and may prioritize efficiency and cost-effectiveness, leading them to opt for synthetic fertilizers that provide nutrients in a more concentrated form.

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  • 8. 

    In the stratosphere, temperature increases with altitude, due to absorption of UV light by oxygen and ozone.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    The stratosphere is a layer of the Earth's atmosphere that is located above the troposphere. In this layer, the temperature actually increases with altitude. This is primarily because of the absorption of ultraviolet (UV) light by oxygen and ozone molecules. As UV light is absorbed, it causes a heating effect, leading to an increase in temperature. Therefore, the statement that temperature increases with altitude in the stratosphere is true.

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  • 9. 

    Biomes are affected by ocean currents and water flow.

    • True.

    • False

    Correct Answer
    A. True.
    Explanation
    Ocean currents and water flow play a significant role in shaping and influencing biomes. These currents transport heat, nutrients, and organisms, which in turn affect the temperature, salinity, and productivity of the water. The movement of water also helps distribute nutrients and oxygen, which are essential for the survival of marine organisms. Additionally, ocean currents can impact weather patterns and climate, further influencing the characteristics and distribution of biomes on land. Therefore, it is true that biomes are affected by ocean currents and water flow.

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  • 10. 

    The effect of a population increase or environmental resistance is not felt instantly in most cases.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    The statement suggests that when there is a population increase or environmental resistance, the effects are not immediately noticeable. This is because population dynamics and environmental changes take time to manifest and have an impact on the ecosystem. Therefore, it is true that the effects are not felt instantly in most cases.

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  • 11. 

    A relationship in which both speicies benefit is best labeled

    • Competion.

    • Predation.

    • Mutualism.

    • Parasitism.

    • Commensalism.

    Correct Answer
    A. Mutualism.
    Explanation
    Mutualism refers to a relationship in which both species involved benefit from the interaction. This type of relationship is characterized by cooperation and mutual dependence, where both species gain advantages such as food, protection, or reproduction. In mutualistic interactions, both species have evolved to rely on each other for survival and reproductive success. This differs from competition, predation, parasitism, and commensalism, where one or both species involved are harmed or do not benefit equally.

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  • 12. 

    The world's economies are not affected by climate change.

    • True.

    • False.

    Correct Answer
    A. False.
    Explanation
    The statement that "The world's economies are not affected by climate change" is false. Climate change has significant impacts on economies worldwide. It affects various sectors such as agriculture, tourism, energy, and infrastructure. Extreme weather events, rising sea levels, and temperature changes can lead to crop failures, damage to infrastructure, increased healthcare costs, and displacement of populations. These effects can have severe economic consequences, including loss of productivity, increased costs, and reduced economic growth. Therefore, it is incorrect to say that the world's economies are not affected by climate change.

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  • 13. 

     Since 1920, urban areas in the United States have seen improvements in

    • Housing conditions.

    • Medical care.

    • Air and water quality.

    • Sanitation.

    • All of these answers.

    Correct Answer
    A. All of these answers.
    Explanation
    The correct answer is "all of these answers." Since 1920, urban areas in the United States have indeed seen improvements in housing conditions, medical care, air and water quality, and sanitation. These improvements have been made over time to enhance the overall living conditions and well-being of urban residents.

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  • 14. 

     Inland wetlands are valuable for providing

    • Wildlife habitat.

    • Improved water quality.

    • Regulated stream flow.

    • All of these answers

    • None of these answers

    Correct Answer
    A. All of these answers
    Explanation
    Inland wetlands are valuable for providing wildlife habitat because they offer a diverse range of ecosystems that support a variety of plant and animal species. They also help improve water quality by filtering and purifying water as it passes through wetland vegetation. Additionally, inland wetlands play a crucial role in regulating stream flow by absorbing and storing excess water during periods of heavy rainfall and slowly releasing it during dry periods, thereby preventing floods and droughts. Therefore, all of these answers are correct as they highlight the various benefits that inland wetlands provide.

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  • 15. 

     Today's cities are not self-sustaining because they import

    • Minerals.

    • Energy.

    • Food.

    • Manufactured goods.

    • All of these answers.

    Correct Answer
    A. All of these answers.
    Explanation
    Today's cities are not self-sustaining because they rely on imports for various essential resources. They import minerals for construction and manufacturing, energy for power and transportation, food for sustenance, and manufactured goods for consumption. Without these imports, cities would struggle to meet their basic needs and maintain their infrastructure. Therefore, the correct answer is that cities are not self-sustaining because they import all of these resources.

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  • 16. 

    Energy can be formally defined as

    • The random motion of molecules.

    • The ability to do work or produce heat transfer.

    • A force that is exerted over some distance.

    • The movement of molecules.

    • The loss of matter.

    Correct Answer
    A. The ability to do work or produce heat transfer.
    Explanation
    The correct answer is "the ability to do work or produce heat transfer." This definition of energy encompasses its two main forms: the capacity to perform work and the ability to transfer heat. Energy is not specifically related to the random motion of molecules, the exertion of force over a distance, the movement of molecules, or the loss of matter.

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  • 17. 

    Reducing illegal immigration into the United States would increase the rate of economic growth.

    • True.

    • False.

    Correct Answer
    A. True.
    Explanation
    Reducing illegal immigration into the United States would increase the rate of economic growth because it would lead to a decrease in the supply of low-skilled workers, which in turn would result in higher wages for American workers in similar industries. Additionally, reducing illegal immigration would also decrease the strain on public resources such as healthcare and education, allowing for more investment in other areas of the economy. Overall, this would contribute to higher economic productivity and growth.

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  • 18. 

    All of the following are abiotic factors except

    • Light.

    • Bacteria.

    • PH.

    • Size of soil particles.

    • Water.

    Correct Answer
    A. Bacteria.
    Explanation
    Abiotic factors refer to non-living components of an ecosystem that can influence living organisms. Light, pH, size of soil particles, and water are all abiotic factors as they do not possess life. Bacteria, on the other hand, are living organisms and therefore cannot be considered as abiotic factors.

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  • 19. 

     Cities established on barrier islands are subject to 

    • Beach erosion.

    • Hurricanes.

    • Flooding.

    • All of these answers.

    • None of these answers.

    Correct Answer
    A. All of these answers.
    Explanation
    Cities established on barrier islands are subject to beach erosion, hurricanes, and flooding. Barrier islands are naturally prone to erosion due to the constant action of waves and currents. Additionally, barrier islands are often located in coastal areas that are susceptible to hurricanes, which can cause extensive damage. Furthermore, the low-lying nature of barrier islands makes them vulnerable to flooding, especially during storms and high tides. Therefore, cities established on barrier islands are at risk of experiencing all of these issues.

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  • 20. 

    Advantages of automobiles include all of the following except

    • Freedom to go where you want when you want.

    • Adventure.

    • Energy efficiency.

    • Provisions of jobs.

    • Convenience of use.

    Correct Answer
    A. Energy efficiency.
    Explanation
    Automobiles offer various advantages such as the freedom to travel wherever and whenever desired, the opportunity for adventure, the provision of jobs, and the convenience they provide. However, energy efficiency is not one of these advantages. Automobiles are known to consume significant amounts of energy, particularly in terms of fuel consumption, making them less efficient compared to other modes of transportation.

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  • 21. 

    The organisms that are classified as primary consumers are the 

    • Detritivores.

    • Omnivores.

    • Carnivores.

    • Decomposers.

    • Herbivores.

    Correct Answer
    A. Herbivores.
    Explanation
    The organisms that are classified as primary consumers are herbivores. Herbivores are organisms that primarily feed on plants or plant material. They obtain their energy by consuming producers, such as plants, and are considered the first level of consumers in a food chain or food web. They play a crucial role in transferring energy from plants to higher trophic levels in an ecosystem. Detritivores, omnivores, carnivores, and decomposers are not classified as primary consumers as they have different feeding habits and occupy different trophic levels in the food chain.

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  • 22. 

    Characteristics that make amphibians particularly sensitive to pollution include

    • Living part of their life cycle in water and part on land.

    • Soft, permeable skin.

    • Sensitivity to ultraviolet radiation.

    • All of these answers.

    • None of these answers.

    Correct Answer
    A. All of these answers.
    Explanation
    Amphibians are particularly sensitive to pollution due to a combination of factors. Firstly, they have a life cycle that involves living in both water and on land, making them vulnerable to pollutants in both environments. Additionally, amphibians have soft and permeable skin, which allows for the absorption of pollutants from the surrounding water or soil. Lastly, they are also sensitive to ultraviolet radiation, which can be intensified by pollution. Therefore, all of these characteristics contribute to the heightened sensitivity of amphibians to pollution.

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  • 23. 

     Developed countries

    • A highly industrialized.

    • Have a low GNP per person.

    • Are generally located in Asia.

    • Make up about 80% of the world's population.

    • Use about 12% of the world's natural resources.

    Correct Answer
    A. A highly industrialized.
    Explanation
    The correct answer is "a highly industrialized." This is because developed countries are characterized by having advanced industrial sectors and economies that rely heavily on manufacturing and technology. They typically have high levels of infrastructure, technology, and skilled labor, which contribute to their industrialization. This industrialization allows them to have higher standards of living, better healthcare, and more advanced education systems compared to developing countries.

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  • 24. 

    According to pesticide proponents, pesticides

    • Work faster than alternate controls.

    • Increase profit for farmers.

    • Save lives and money.

    • Increase food supplies and lower costs.

    • All of these answers.

    Correct Answer
    A. All of these answers.
    Explanation
    The correct answer is "all of these answers." Pesticide proponents argue that pesticides work faster than alternative controls, increase profit for farmers, save lives and money, and increase food supplies while lowering costs. This suggests that the use of pesticides has multiple benefits and can address various issues related to agriculture and public health.

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  • 25. 

    About _____ of the world fish harvest is used primarily as animal feed, fish meal, and oils.

    • One-half

    • One-third

    • One-fourth

    • One-fifth

    • One-sixth

    Correct Answer
    A. One-third
    Explanation
    Approximately one-third of the world fish harvest is used primarily as animal feed, fish meal, and oils. This means that out of the total fish harvested worldwide, around one-third of it is not directly consumed by humans but rather utilized for other purposes such as feeding livestock or extracting oils.

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  • 26. 

     The UNICEF program to sharply reduce childhood deaths from improper nutrition would include all of the following except

    • Discouraging breastfeeding.

    • Preventing dehydration by giving infants sugar and salt in water.

    • Giving vitamin A supplements.

    • Providing family planning services.

    • Giving iron supplements.

    Correct Answer
    A. Discouraging breastfeeding.
    Explanation
    The UNICEF program aims to reduce childhood deaths from improper nutrition. Breastfeeding is a crucial component of proper nutrition for infants, providing them with essential nutrients and antibodies. Therefore, it would not be included in a program that aims to reduce childhood deaths from improper nutrition. The other options, such as preventing dehydration, providing vitamin A and iron supplements, and offering family planning services, are all strategies that can contribute to improving nutrition and reducing childhood deaths.

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  • 27. 

    Autotrophs

    • Can live without heterotrophs.

    • Are know as producers.

    • Carry on photosynthesis.

    • All of these answers.

    • None of these answers.

    Correct Answer
    A. All of these answers.
    Explanation
    The correct answer is "all of these answers." Autotrophs are organisms that can produce their own food through photosynthesis, allowing them to live without relying on heterotrophs for nutrition. They are also known as producers because they are capable of synthesizing organic molecules from inorganic substances. Therefore, all of the given statements are true for autotrophs.

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  • 28. 

    Climate and vegetation vary with

    • Latitude only.

    • Altitude only.

    • Latitude and altitude.

    • Latitude and longitude.

    • Altitude and longitude.

    Correct Answer
    A. Latitude and altitude.
    Explanation
    The correct answer is latitude and altitude. Climate and vegetation are influenced by both latitude and altitude. Latitude affects climate by determining the amount of solar radiation received, while altitude affects climate by influencing temperature and air pressure. Vegetation is also influenced by both factors, as different plants have different temperature and moisture requirements. Therefore, both latitude and altitude play a significant role in determining the climate and vegetation patterns of a particular region.

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  • 29. 

    Sustainable agriculture

    • Uses pesticides.

    • Minimizes erosion.

    • Requires high inputs of fossil fuel.

    • Employs massive fertilization programs.

    • Wastes water.

    Correct Answer
    A. Minimizes erosion.
    Explanation
    Sustainable agriculture focuses on practices that minimize erosion, which refers to the process of soil being washed away by water or blown away by wind. By implementing erosion control measures such as contour plowing, terracing, and cover cropping, sustainable agriculture aims to protect the soil from erosion and maintain its fertility for long-term agricultural productivity. This practice helps to conserve the soil, prevent nutrient runoff into water bodies, and promote environmental sustainability.

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  • 30. 

    Weather occurs

    • In the troposphere.

    • At a particular place.

    • At a particular time.

    • All of these answers.

    • None of these answers.

    Correct Answer
    A. All of these answers.
    Explanation
    The statement "Weather occurs in the troposphere" is correct because the troposphere is the lowest layer of the Earth's atmosphere where weather phenomena such as clouds, precipitation, and storms take place. Additionally, weather occurs at a particular place because different regions experience different weather conditions. Furthermore, weather occurs at a particular time as it constantly changes throughout the day and seasons. Therefore, the correct answer is all of these answers.

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  • 31. 

    In alley cropping,

    • Crops are planted between hedgerows of trees or shrubs that are used for fruits or fuelwood.

    • Terrace are built to prevent swift water runoff.

    • Plowing runs across slopes.

    • Special tillers are used so the topsoil is not disturbed.

    • A row crops alternates in strips with another row crop.

    Correct Answer
    A. Crops are planted between hedgerows of trees or shrubs that are used for fruits or fuelwood.
    Explanation
    In alley cropping, crops are planted between hedgerows of trees or shrubs that are used for fruits or fuelwood. This practice allows for the simultaneous cultivation of annual crops and the production of trees or shrubs for additional benefits such as providing fruits or fuelwood. The trees or shrubs act as windbreaks, provide shade, and help in reducing soil erosion. This system promotes sustainable agriculture by maximizing land use efficiency and diversifying income sources for farmers.

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  • 32. 

    A tree grower using uneven-aged management most likely has the goal of 

    • Decreasing biological diversity.

    • Maintaining long-term production of high-quality timber.

    • Producing quick economic return.

    • Producing fiber for paper mills.

    • Increasing erosion.

    Correct Answer
    A. Maintaining long-term production of high-quality timber.
    Explanation
    A tree grower using uneven-aged management aims to maintain long-term production of high-quality timber. Uneven-aged management involves selectively cutting trees of different ages and sizes, allowing for a diverse range of tree species and age classes within the forest. This method promotes the growth and development of high-quality timber over time, as it allows for the natural regeneration of trees and ensures a continuous supply of mature trees for harvesting. It also helps to maintain the overall health and productivity of the forest ecosystem.

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  • 33. 

     Leaf mold, a humus-mineral mixture, and silty loam are indicative of

    • Coniferous forest soil.

    • Deciduous forest soil.

    • Tropical forest soil.

    • Grassland soil.

    • Desert soil.

    Correct Answer
    A. Deciduous forest soil.
    Explanation
    Leaf mold, a humus-mineral mixture, and silty loam are characteristics commonly found in deciduous forest soil. Leaf mold refers to decomposed leaves that provide organic matter, while a humus-mineral mixture indicates a balance of organic and inorganic materials. Silty loam refers to the soil texture, which is a combination of silt and sand particles. These characteristics are typical of deciduous forests, where the leaf litter from deciduous trees contributes to the formation of leaf mold and the overall composition of the soil.

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  • 34. 

    Good wilderness management would do all of the following except

    • Extensively patrol the accessible popular areas.

    • Offer permits to selected area for those who have demonstrated wilderness skills.

    • Leave some areas undisturbed by humans

    • Allow citizens to camp anywhere at their own risk.

    • Limit number of people using sites at any one time.

    Correct Answer
    A. Allow citizens to camp anywhere at their own risk.
    Explanation
    Good wilderness management aims to protect and preserve natural areas while minimizing human impact. This includes limiting the number of people using sites at any one time to prevent overcrowding and damage to the environment. It also involves leaving some areas undisturbed by humans to maintain biodiversity and ecological balance. Additionally, offering permits to selected areas for those with demonstrated wilderness skills helps ensure that visitors are knowledgeable and responsible. Extensively patrolling accessible popular areas helps enforce regulations and prevent illegal activities. However, allowing citizens to camp anywhere at their own risk would not be a responsible approach as it could lead to environmental damage and safety hazards.

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  • 35. 

    The actual average replacement-level fertility for the whole world is slightly higher than

    • 1 child per couple.

    • 2 children per couple.

    • 3 children per couple.

    • 4 children per couple.

    • 6 children per couple.

    Correct Answer
    A. 2 children per couple.
    Explanation
    The actual average replacement-level fertility for the whole world is slightly higher than 2 children per couple. Replacement-level fertility refers to the number of children a couple needs to have in order to replace themselves in the population. In order to account for mortality and individuals who do not have children, the replacement-level fertility is slightly higher than 2. This means that on average, each couple needs to have slightly more than 2 children in order to maintain a stable population size.

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  • 36. 

    Species that migrate or are accidentally introduced into an ecosystem are called

    • Indicator species.

    • Native species.

    • Keystone species.

    • Specialist species.

    • Nonnative species.

    Correct Answer
    A. Nonnative species.
    Explanation
    The correct answer is "nonnative species" because species that migrate or are accidentally introduced into an ecosystem are referred to as nonnative species. These species are not naturally found in the ecosystem and can have significant impacts on the native species and the overall balance of the ecosystem.

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  • 37. 

     Which of the following is an example of low-quality energy?

    • Electricity

    • Heat in the ocean

    • Nuclei of uranium-235

    • Coal

    • Oil

    Correct Answer
    A. Heat in the ocean
    Explanation
    Heat in the ocean is an example of low-quality energy because it is dispersed and difficult to harness for useful work. Unlike electricity, which can be easily converted into other forms of energy, or the nuclei of uranium-235, which can be used in nuclear reactions, heat in the ocean is not easily converted into a more concentrated or usable form of energy. Therefore, it is considered low-quality energy.

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  • 38. 

     Which of the following types of agriculture is most characteristic of developing countries?

    • Plantation agriculture

    • Traditional agriculture

    • Industrialized agriculture

    • Minimum-tillage agriculture

    • High-input agriculture

    Correct Answer
    A. Traditional agriculture
    Explanation
    Traditional agriculture is most characteristic of developing countries because it is a subsistence-based form of farming that relies on traditional methods and tools, such as manual labor and simple tools. It is typically practiced by small-scale farmers who grow a variety of crops for their own consumption and local markets. This type of agriculture is often influenced by cultural and traditional practices, and it is less mechanized and reliant on external inputs compared to industrialized agriculture. Traditional agriculture is prevalent in developing countries where access to modern technology, capital, and resources is limited.

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  • 39. 

    Logging in the United States National Forests has no clear advantages because it provides only 3% of our lumber needs and has little impact on lubmer prices.

    • True.

    • False.

    Correct Answer
    A. False.
    Explanation
    Logging in the United States National Forests does have clear advantages. While it may only provide 3% of our lumber needs, it plays a crucial role in maintaining the health and biodiversity of these forests. Logging helps manage the forest ecosystem, reduces the risk of wildfires, and supports the local economy by providing jobs. Additionally, the impact on lumber prices may not be significant, but the environmental benefits and sustainable management of these forests outweigh the minimal impact on prices.

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  • 40. 

     Which of the following statements best illustrates the tragedy of the commons?

    • A factory pollutes a river as much as the law allows.

    • Some levels of pollution are life threatening.

    • Some activities harm the environment, but others do not.

    • Irrigated cropland can be ruined by salinization.

    • Cropland can decrease biodiversity.

    Correct Answer
    A. A factory pollutes a river as much as the law allows.
    Explanation
    This statement best illustrates the tragedy of the commons because it shows how a factory is exploiting a shared resource, the river, to its maximum extent without considering the negative consequences on the environment or other users of the resource. The factory is polluting the river up to the legal limit, indicating a lack of concern for the long-term sustainability of the resource and the well-being of other stakeholders. This scenario highlights the tragedy of the commons, where individual self-interest leads to the degradation of a commonly shared resource.

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  • 41. 

    Based on the theory of island biogeography, you would predict that large islands near the mainland would have relatively

    • High immigration and low extinction rates.

    • High immigration and high extinction rates.

    • Low immigration and low extinction rates.

    • Low immigration and high extinction rates.

    • Not enough information to predict.

    Correct Answer
    A. High immigration and low extinction rates.
    Explanation
    According to the theory of island biogeography, large islands near the mainland would have high immigration rates because they are closer to the source population on the mainland. This means that there would be a higher likelihood of individuals from the mainland colonizing the large island. On the other hand, large islands near the mainland would have low extinction rates because they offer a larger and more diverse habitat, which can support larger populations and reduce the risk of extinction. Therefore, the correct answer is high immigration and low extinction rates.

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  • 42. 

    The fragility of the desert ecosystem is indicated by 

    • The high growth rate of plants.

    • Moderate species diversity.

    • Abundant groundwater.

    • Long regeneration time from vegetation destruction.

    • Having shallow roots.

    Correct Answer
    A. Long regeneration time from vegetation destruction.
    Explanation
    The fragility of the desert ecosystem is indicated by the long regeneration time from vegetation destruction. This means that when plants in the desert are destroyed, it takes a significant amount of time for them to grow back. This suggests that the ecosystem is not resilient and is easily disrupted by disturbances. The other options, such as high growth rate of plants, moderate species diversity, abundant groundwater, and having shallow roots, do not necessarily indicate fragility as they can be present in a healthy and robust ecosystem.

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  • 43. 

    A shark is least likely to be killed

    • By a predator.

    • For sport.

    • Out of fear.

    • For food.

    • For their jaws.

    Correct Answer
    A. By a predator.
    Explanation
    Sharks are apex predators and are at the top of the food chain, meaning they have few natural predators. They are highly adapted for hunting and have few threats in their natural environment. Therefore, it is unlikely for a shark to be killed by another predator.

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  • 44. 

    The crude birth rate is the number of live births per _____ persons in a given year.

    • 50

    • 100

    • 500

    • 1,000

    • 10,000

    Correct Answer
    A. 1,000
    Explanation
    The crude birth rate is the number of live births per 1,000 persons in a given year. This means that for every 1,000 people in a population, a certain number of live births occur in a year. It is a measure used to understand the fertility level of a population and is often used in demographic studies and policy-making decisions.

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  • 45. 

     To decay to what is considered to be a safe level a sample of radioisotope should be stored in a safe enclosure for approximately _____ half lives.

    • 2

    • 5

    • 10

    • 20

    • 30

    Correct Answer
    A. 10
    Explanation
    To decay to what is considered to be a safe level, a sample of radioisotope should be stored in a safe enclosure for approximately 10 half-lives. This is because during each half-life, half of the radioactive material decays, reducing the amount of radiation emitted. By storing the sample for 10 half-lives, the radiation level decreases significantly, making it safe for handling or disposal.

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  • 46. 

    All of the following harmful effects have been linked to prolonged exposure to excessive noise except

    • Gastric ulcers.

    • Psychological disorders and irritability.

    • High blood pressure and higher cholesterol levels.

    • Skin cancer.

    • Hearing loss.

    Correct Answer
    A. Skin cancer.
    Explanation
    Prolonged exposure to excessive noise has been linked to various harmful effects such as gastric ulcers, psychological disorders and irritability, high blood pressure and higher cholesterol levels, and hearing loss. However, there is no established link between excessive noise exposure and the development of skin cancer. Therefore, skin cancer is the exception among the given options.

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  • 47. 

     Of the following forms of birth control, the least effective is 

    • IUD plus spermicide.

    • An oral contraceptive.

    • A hormonal implant.

    • A condom (good brand).

    • The rhythm method.

    Correct Answer
    A. The rhythm method.
    Explanation
    The rhythm method is considered the least effective form of birth control because it relies on tracking a woman's menstrual cycle to determine when she is most fertile and avoiding intercourse during that time. However, this method is highly dependent on the regularity of a woman's cycle and can be easily disrupted by factors such as stress or illness. Additionally, it does not provide any protection against sexually transmitted infections. In contrast, the other options listed (IUD plus spermicide, oral contraceptive, hormonal implant, condom) are all more effective at preventing pregnancy when used correctly.

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  • 48. 

    To qualify as a metropolitan area, a city must have a population of _______ people.

    • 25,000

    • 50,000

    • 75,000

    • 100,000

    • 500,000

    Correct Answer
    A. 50,000
    Explanation
    To qualify as a metropolitan area, a city must have a population of at least 50,000 people. This population threshold is typically used to distinguish between smaller urban areas and larger metropolitan areas. Metropolitan areas are characterized by higher population densities, economic activity, and social infrastructure compared to smaller cities or towns. The 50,000 population requirement ensures that a city has a sufficient size and scale to support the necessary infrastructure, services, and resources typically associated with metropolitan areas.

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  • 49. 

     The surface litter horizon is described by the letter

    • A.

    • B.

    • C.

    • O.

    • D.

    Correct Answer
    A. O.

Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Mar 22, 2023
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