ENV 101 Exam 2 pt 1 Essays

ENV 101 Exam 2 pt 1 Essays ENV 101 Exam 2 pt 1 Paper ENV 101 Exam 2 pt 1 Paper What is the difference in the adaptation of a sled dogs (such as a Husky) thick coat of hair to help it withstand the cold temperatures of Arctic winters and a dog that adapts to cold temperatures in the fall by growing a thickened coat? The adaptation of the sled dog best describes adaptation at the ____________ level while the dog exposed to seasonal colder temperatures has _____________. Population; physiological modifications at the individual level Evolution occurs as a result of Better survival or reproduction rates by individuals with a particular characteristic Which of the following is a physiological modification used to adapt to environmental conditions? Leaves becoming thick and leathery on a plant growing in a dry, hot climate Natural selection will ultimately make a species Better adapted to its environment Regular lawn mowing selects for short-headed rather than tall-headed dandelions because Short flowers have less competition when the lawn is mowed often Tolerance limits are _______ that limit a species survival. Any environmental conditions A species can withstand a wide range of pH as an adult but the juveniles can only withstand a narrow range of pH. The abiotic factor, pH, would best be described as a Stress factor Which of the following fish species would be the best indicator of clean, well-oxygenated water? Rainbow trout Populations are most critically limited by Any of these, depending on the system Indicator species, such as lichens, generally have a ___________ tolerance range for a ___________. Narrow; critical factor A species can withstand a narrow range of temperature. Above 100?F there are no species present. In the range from 97?F to 100?F and 90?F to 94?F there are a few species present. Below 90?F there are no species present. 11. What would you label the range of temperature from 90?F to 94?F for this particular species? Zone of physiological stress What would you label the range of temperature from 95?F to 96?F for this particular species in the scenario? Optimal range A generalist is a species that Occupies a variety of ecological niches Certain night-active moths and day-active birds are specialized nectar feeders. How do these species coexist if they are using the same resource for food? They do not compete for the nectar because they feed at different times of the day Humans can best be described as Generalists Resource partitioning leads species to All of these would be a result of resource partitioning Resource partitioning tends to lead to a high degree of _______ in species Specialization Intraspecific competition is competition among ________ for resources Members of a single species Which of the following is not a common strategy for successful interspecific competition? The life cycle of dragonflies (the larva live in the water) An especially effective strategy for reducing intraspecific competition is Different ecological niches for juveniles and adults Symbiosis means A relationship in which both species benefit In the partnership of a lichen, the fungus provides _________ and the relationship is best described as structure and moisture-holding ability; mutualism A keystone species is a species whose presence Influences the population size of many other species in its community In a commensal relationship, One species benefits while the other neither suffers nor benefits A biological communitys productivity is a measure of amount of biomass produced in the community Abundance describes the total number of _________ while diversity describes the number of _________. Organisms in a community; species in a community In a biological community where diversity is great, such as a tropical rainforest, the abundance of any one species is likely to be Small As a rule, near the Earths north and south poles, Neither abundance nor diversity is high Complexity in an ecological community has to do with the number of species at each trophic level A community with hundreds of different types of primary producers, a few herbivores and only one carnivore, has Little complexity A community that changes very little over time is said to have great Constancy In the coastal forest of Oregon an area was clear-cut for logging. Trees at the edge of the clearing and 200 meters into the forest died within a few months after the logging began. What is the best explanation for the death of the trees? increased sunlight, wind and temperature negatively affected the trees A closed community has a Narrow ecotone A climax community is one that Is relatively stable and long lasting Primary succession occurs when a community develops ____________ while secondary succession occurs when one ________. On unoccupied ground; biological community replaces another As ecological development proceeds, a biological community Becomes more diverse The most common reason that introduced species cause trouble is because they Disrupt pre-existing niches Which of the following migrations is likely to cause the extinction of a native species? The introduction of a predator onto an island originally free from predators A biome is described by Broadly similar environmental conditions Location of specific biomes can be predicted based on Precipitation and temperature In the graph of precipitation and temperature, desert biomes would fall in the area marked by the letter A Neo and Trinity are in a biome that has relatively stable temperatures and abundant rainfall. They have a graph of precipitation and temperature similar to the one shown. Which letter marks the biome they are located in? C Cloud forests are found in ________ areas in tropical regions. Cool mountainous Neo finds himself sweating in a moist forest but there arent many streams or wetlands. He is amazed by the tremendous amount of biodiversity including an abundance of biting mosquitoes. Has he inadvertently gotten closer to his goal of finding a boreal forest? No the description is that of a tropical rainforest A biome absent from North America is the Tropical rainforest Which of the following is an example of a specialization that plants in the desert may have? All of these are adaptations of plants living in desert conditions Tropical seasonal forests are specially adapted to tolerate Annual cycles of severe drought and heavy rain