This is the last ecology homework. Next week we will go on to our next topic: Evolution. Our ecology unit test will be on Thursday of this week. I know a few are going on a class trip. You that do should plan on doing the test on Friday. Before you send your homework to me feel free to ask me questions if you are not clear on any question. The textbook should lead you to all the right answers...so use it.
Question #1:When Mount St. Helens erupted in 1980, a portion of the surrounding area ws covered by lava, which buried all of the vegetation. Four months later, Anaphalis margaritacea plants were found growing out of lava rock crevices, The beginning of plant regrowth in this area is a part of the process known as
(1)species preervation
(2) evolution
(3) biotic competition
(4) succession
Question #2: The graph below shows that changes in two populations of herbivores in a grassy field. A possible reason for these changes is that
(1) all of the plant populations in this habitat decreased
(2) population B competed more successfully for food than population A did
(3)population A produced more offspring than population B did
(4)population A consumed the members of population B
Question #3:Base your answer on the diagram below and on your knowledge of biology. The diagram illustrates the relationships between the organisms in a certain pond. In addition to sunlight, another factor needed to make this a self-sustaining ecosystem would be the presence of
(1) producers
(2)primary consumers
(3)decomposers
(4)higher order consumers
Question #4:Base your answer on the diagram above (question #3) and on your knowledge of biology. The diagram illustrates the relationships between the organisms in a certain pond. In this pond community, which organisms are secondary consumers?
(1)aquatic crustaceans and racoons
(2)carnivorous fish and aquatic crustaceans
(3)ducks and minnows
(4)ducks and carnivorous fish
Question #5:The dotted line on the graph below represents the potential size of a
population based on its reproductive capacity. The solid line on this graph
represents the actual size of the population.
Which statement best explains why the actual population growth is less
than the potential population growth?
(1) Resources in the environment are limited.
(2) More organisms migrated into the population than out of the population.
(3) The birthrate gradually became greater than the death rate.
(4) The final population size is greater than the carrying capacity.
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