APES Unit 1 :Ecology: 1.4-1.11 Ecosystems& Cycles

 Which step of the nitrogen cycle does NOT involve bacteria?

• Nitrogen fixation 
• Denitrification 
• Nitrification 
• Assimilation

Of the following, which occupies the lowest trophic level?

• Spider
• Bat
• Rabbit
• Tiger

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In this Food Web Pyramid Which type of consumer gets only 10% of the energy stored in plants?

• Herbivore
• Carnivore
• Omnivore
• Top carnivore

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In the energy pyramid shown, which organism has the least amount of biomass?

• Producers
• Herbivores
• Carnivores
• Top Predator

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Humans impose the largest negative impact on the carbon cycle by ________________

• cultivating crops
• burning fossil fuels
• harnessing solar power
• mining

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1.  Eutrophication in lakes results from

• 1.  Eutrophication in lakes results from
• a.  A decrease in temperatures
• a.  An increase in carbon dioxide in the air
• a.  An increase in nutrients in the lake

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Nitrogen becomes available to plants by all of the following processes EXCEPT

• ammonification 
• denitrification by denitrifiying bacteria
• nitrification by nitrifying bacteria
• nitrogen fixation in plant nodules

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In which trophic level would the biological magnification of the pesticide DDT be most evident?

• oak tree
• caterpillar 
• bluetit
• sparrowhawk

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As it moves through the various food web, energy

• is lost
• is gained
• stays the same
• none of these

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Which of the following best explains why there are usually no more than five trophic levels in a food chain?

• there are not enough organisms to fill more than five levels
• there is too much competition among the organisms at the lower levels to support more animals at higher levels
• the statement is not true; there can be unlimited amount of trophic levels
• energy is lost at each trophic level

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