49. Chronic patchiness commonly occurs in which of the following cases of secondary succession? A. saguaro cactuses randomly distributed wherever nutrients happen to be (in the desert soil) B. pioneer shrubs producing aromatic chemicals to inhibit other plants (in the chaparral) C. pioneer species forming dense stands to stop seed germination by other plants (in forests) D. dune grass stabilizing sandy soils so that other species can grow there (in sand dunes) E. pioneer grasses forming thick mats to prevent other plants from germinating (in prairies)

49. Chronic patchiness commonly occurs in which of the following cases of secondary succession? A. saguaro cactuses randomly distributed wherever nutrients happen to be (in the desert soil) B. pioneer shrubs producing aromatic chemicals to inhibit other plants (in the chaparral) C. pioneer species forming dense stands to stop seed germination by other plants (in forests) D. dune grass stabilizing sandy soils so that other species can grow there (in sand dunes) E. pioneer grasses forming thick mats to prevent other plants from germinating (in prairies)

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter53: Population Interactions And Community Ecology

Section: Chapter Questions

Problem 7TYK: The change in the species composition of a terrestrial community from bare and lifeless rock to...

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In a tropical rainforest, an open gap lacking vegetation has been created by the fall of a large tree. Which of the following statements describes the characteristics of the plant species that are last to colonize this disturbed habitat? a. they have low reproductive rates and are good competitors b. they are good colonizers c. they have high reproductive rates and are poor competitors d. they are dominated by r-selected species e. they have high species diversity
Which of the following locations would NOT represent a site for primary succession? A. A forest that was recently destroyed by a fire. B. A volcanic island. C. A retreating glacier. D. All of the above represent sites of primary succession.
Primary”succession is succession that:a.involves establishment of primary producers where there were none.b.leads to establishment of a climax community dominated by primaryproducers.c.occurs on newly exposed geologic substrates, not organic soil.d.occurs where organic soils have been exposed but not destroyed bydisturbance.e.occurs after fire or agricultural abandonment.
1.Modern agroecosystems differ from natural ecosystems in all of the following ways except: A. they attempt to suppress ecological succession by allowing only pioneer species to thrive B. they tend to raise crops in multiculture rather than monoculture (a single species) C. they tend to plant crops in neat, orderly rows rather than complex spatial arrangements D. they make the food chain less complex, so that lower species diversity results E. they (the artificial ecosystems) tend to be less complex than the natural ecosystems
Duringprimary succession at Glacier Bay, overall plant species diversity:a.first increases rapidly, then levels off.b.increases steadily throughout succession.c.increases slowly at first, then more rapidly after a few hundred years.d.peaks at intermediate successional stages.e.decreases steadily throughout succession.
Through succession, a field becomes a forest as hardwood trees become the dominant species in the ecosystem. Grasses are no longer able to compete as well in the forested environment. grasses → shrubs → softwood trees → hardwood trees Which is most likely the limiting factor that inhibits the growth of the grasses in the forest? a slow rates of decomposition on the forest floor b low levels of sunlight reaching the forest floor c thin layers of topsoil on the forest floor d low levels of humidity near the forest floor
A rancher grazes cattle in a forest reserve. The cattle selectively graze grasses, herbs, and small shrubs. After 10 years, the cattle are removed from the forest and the forest begins to change back the way it was before the cattle were introduced. The changes in the forest would be an example of a. a climax community b. a pioneer community c. primary succession d. secondary succession
A mountainous volcano has erupted and destroyed all evidence of the previous ecosystem. The lava has cooled, leaving no trace of previous inhabitants. Years go by with no apparent change in the affected region. What evidence would first signal the succession of the community? A. Appearance of pioneer species B. Appearance of flowering plants in springtime C. Splitting of lava from regrowth of trees D. Saturation of lava with moisture for plant growth
All of the statements are correct regarding ecological succession EXCEPT Select one: a. there is less competition earlier in the succession process b. it is a random process c. initial pioneer species are plants d. species diversity increases as succession proceeds
Howdoes canopy shading influence succession of pines and deciduous trees in the Piedmontof North Carolina?a.Canopy shading by deciduous trees is required for growth of pines.b.Canopy shading by deciduous trees prevents establishment of pines untillate in succession.c.Canopy shading by deciduous trees prevents persistence of pines in latesuccessional stages.d.Canopy shading by pines prevents establishment of deciduous trees.e.Canopy shading by pines kills deciduous trees that were establishedearly in succession.
Primary Succession... A. is very uncommon B. must happen before secondary succession C. depends on forest fire
Which of the following disturbance would likely result in primary succession? Select one: a. Seafloor habitat is disturbed by trawlers that are being dragged along the seabed. b. Shenandoah National Park floods, resulting in destruction of plant life in the area. c. Some areas in the direct blast zone of Mount St. Helens’ volcanic eruption are covered with pyroclastic flow deposits. d. Receding Kaskawulsh Glacier diverts Slims River, exposing the sediments in the riverbed.