Ecology Unit Review

Bears and coyotes both consume large plant-eating mammals such as deer. When the deer are in short supply, bears and coyotes may fight over the prey. This type of biological interaction is called

• Commensalism

• Competition

• Rumination

• Mutualism

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If the snow leopard becomes extinct by the year 2018, what will MOST LIKELY happen to the prey populations in the areas in which it lived?

• They will migrate

• They will increase

• They will decrease.

• They will stay the same

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The graph shows the changes in population of black bears in rural Michigan during a single year. Competition for food among the black bear population was most likely the greatest during the

• winter
• late summer
• late spring
• month of June

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Impala share the African plains with other grazing animals and predators. Which change would lead to a DECREASE in the impala population?

• a reduction in the lion population
• an increase in the number of other grazing animals
• an increase in restrictions on the hunting of impala
• a reduction in populations of other impala predators

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Population density is found by dividing the number of organisms in an ecosystem by the total area of the ecosystem. If 50 square meters of an ecosystem are surveyed and 5 rabbits are sighted, what is the estimated population density of the rabbits?

• 1 rabbit per 5 square meters
• 1 rabbit per 10 square meters
• 0.5 rabbit per square meter
• 0.1 rabbit per 5 square meters

Which of the following processes removes oxygen from the atmosphere?

• condensation
• photosynthesis
• respiration
• transpiration

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If the producers in a food web were removed, which of the following changes would most likely occur?

• The entire food web would collapse over time.
• The food web would depend on the decomposers for energy.
• The consumers would begin making energy for the food web.
• The populations of the remaining organisms in the food web would increase

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What is an explanation of why producers are always found at the lowest trophic level?

• Producers are larger than consumers
• Consumers are eaten by a variety of producers
• Producers convert light energy into chemical energy
• Producers are found in fewer numbers than consumers

Beginning with the producer, which represents the correct order in a typical food chain?

• grass- rabbit- fox- mountain lion
• mountain lion- fox- rabbit- grass
• grass- fox- rabbit- mountain lion
• rabbit- fox- mountain lion- grass

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The human body contains nitrogen (N₂) as part of amino acids, ATP, DNA, and RNA. The atmosphere is about 79% nitrogen, but humans cannot use nitrogen in its atmospheric form. How is atmospheric nitrogen made available for use in the human body?

• Plants absorb nitrogen after it is changed to useable compounds by the radiant energy of the Sun.
• Rainwater dissolves the nitrogen gas in the air and makes it available to plants and animals.
• Humans have special enzymes in their lungs to make nitrogen gas useable.
• Bacteria change nitrogen gas to useable compounds that can be absorbed by plants.

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