Exam 52: An Introduction to Ecology and the Biosphere

Imagine that a deep temperate zone lake did not "turn over" during the spring and fall seasons.Based on the physical and biological properties of limnetic ecosystems,what would be the difference from normal seasonal turnover?

Which level of ecological study focuses the most on abiotic factors?

Use this description to answer the following questions. A the human population keeps growing,severe human disturbances are altering many biomes.For example,tropical rainforests are being cut down or burned to create large expanses of agricultural land. -A variety of abiotic and biotic factors can limit species distribution.Plant biologists discovered a rare flowering plant in a small plot of undisturbed rainforest that is now surrounded by recently created agricultural land.The plant is growing and looks healthy,but after two years you see no signs of reproduction.What is (are)the most likely biotic factor(s)that could explain why this plant has not successfully reproduced?

The growing season would generally be shortest in which of the following biomes?

Which of the following might be an investigation of microclimate?

Trees are not usually found in the tundra biome because of

The eight climographs below show yearly temperature (line graph and left vertical axis)and precipitation (bar graph and right vertical axis)averages for each month for some locations on Earth.Choose the climograph that best answers the questions or completes the statement.Climographs may be used once,more than once,or not at all. -Which climograph shows the climate for location 1?

The diagram shows a generalized cross section of the marine environment with various zones labelled with letters.Choose the letter that best answers the question.Letters may be used once,more than once,or not at all. -Which zone is comprised largely of detritus-feeding organisms?

Which of the following statements best describes the effect of climate on biome distribution?

Deserts typically occur in a band at 20 degrees north and south latitude because

Oligotrophic lakes are characterized by

Use this description to answer the following question. In areas of permafrost,stands of black spruce are frequently observed in the landscape,while other tree species are noticeably absent.Often these stands are referred to as "drunken forests" because many of the black spruce are displaced from their normal vertical alignment. -Which of the following is true with respect to oligotrophic lakes and eutrophic lakes?

The distribution of species may be limited by many factors,with the exception of

When climbing a mountain,we can observe transitions in biological communities that are analogous to the changes

In the development of terrestrial biomes,which factor is most dependent on all the others?

Which statements about dispersal are correct? I.Dispersal is a common component of the life cycles of plants and animals. II.Colonization of devastated areas after floods or volcanic eruptions primarily depends upon climate. III.Seeds are important dispersal stages in the life cycles of most flowering plants. IV.Dispersal occurs only on an evolutionary time scale.

Which of the following is responsible for the differences in summer and winter temperature stratification of deep temperate zone lakes?

Which of the following environmental features might influence microclimates?

Which marine zone would have the lowest rates of primary productivity (photosynthesis)?

Which of the following statements best describes the interaction between fire and ecosystems?