Ecology Exam

The table shows the various levels of organisms on Earth. If each level is represented by a circle, which figure represent the relationship among these levels of organization?

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Which scenario describes a population?

• a log providing shelter for beetles, spiders, and snakes

• all of the sunfish, bass, and catfish living in a lake

• all the mice living in a barn

• a squirrel eating acorns

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• W

• X

• Y

• Z

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Rice is a high water demanding wetland crop. Thus, rice will grow best on in soils with low permeability. Examine the chart. Which soil is best for rice cultivation.?

• Type I

• Type II

• Type III

• Type IV

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What is the overall composition of topsoil?

• bacteria, water, and rock particles

• minerals, water, humus, rock particles, and air

• water, sand, and mud

• broken down plant materials, minerals, and air

The graph shows the population of wolves and hare in a grassland. In which year were the habitat of both the wolf and hare MOST LIKELY destroyed by fire?

• 2004

• 2005

• 2008

• 2009

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The diagram shows a forest environment and several organisms that live there. If the rainfall in the area is less than expected what is the most likely impact on the ecosystem?

• More deer and rabbit will immigrate into the area.

• Water will become a limiting factor for all organisms

• The birth rate will increase for rabbit and bird population.

• The organisms will adapt in order to survive with less water.

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A population of bacteria is growing in a small plastic container for a 48 hour period. They were given unlimited food and water, the lid was put on the container to keep other things out of the environment. Which of the following limiting factors most likely stopped the growth of the bacteria population after 28 hours?

• Amount of Space

• Amount of Food

• Amount of Water

• Predator Species

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Would the carrying capacity of an area for a species be affected by the other species that live in the same area?

• No, each species is separate.

• Only if the species in question and the second species eat the same food.

• Only in the winter when food and shelter are more scarce.

• Yes, all the populations in a community affect each other.

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The American alligator and the freshwater crocodile are similar species that feed on fish, amphibians, mammals, and birds. The alligator is found in America. The crocodile is found in Austrailia. Which statement best describes the MOST LIKELY interaction between these two species if they were suddenly living in the same ecosystem?

• The alligator would act as a predator to the crocodile.

• The crocodile would act as a predator to the alligator.

• Both would compete for food resources.

• Both would form a mutualistic relationship.

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