Chemical Cycle Flashcards Preview

AP Biology 2014 > Chemical Cycle > Flashcards

Flashcards in Chemical Cycle Deck (10):

Plants cannot take nitrogen from the air, first it must be converted into a certain form. What form is this? What steps are necessary to converted into this form?

Plants can only use nitrates or ammonium ions. 

Nitrates: nitrogen fixation, ammonification, nitrification

Ammonium ions: nitrogen fixation, ammonification 


Why are nitrogen fixing bacteria important in the nitrogen cycle? Give some examples of these bacteria? 

The nitrogen fixing bacteria combine nitrogen with oxygen or hydrogen to convert the nitrogen into a useful substance for plants such as ammonia or nitrates. 

Ex: Legume, cyanobacteria ect. 

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Where is nitrogen's major reservoir? 

80% of nitrogen is stored in the atmosphere


Describe the process of transpiration? What chemical cycle does this process belong to? 

Transpiration is the movement of water through plant and eventual evaporation of water from plants. Water leaves through pores on leaves called the stoma. This is part of the water cycle. 

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What is the biological importance of water? 

The Water Cycle affects the rate of ecosystem process particularly primary production and decomposition.  


True or False: Water's main reservoir are glaciers and icecaps. 


Only 2% of water if found in ice caps and glaciers. The majority of 


Give an example of a process that adds COto the environment? 

cellular respiration by animals, bacterial decomposers, burning of fossil fuels. 


True or False: Photosynethsis adds COto the air.


Photosynthesis removes CO2 from air and adds O2.

(CO2 is necessary for the Calvin Cycle. )

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What are key 2 processes in the Carbon Cycle? 

Respiration: Releases more CO2 into the air 

Photosynthesis: removes CO from atmosphere


Largest carbon reservior? 

sedimentary rock although it takes many years.