AP Environmental Science : Biochemical Cycles

Study concepts, example questions & explanations for AP Environmental Science

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Example Questions

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Example Question #21 : Energy And Biochemical Cycles

Which answer choice a pair of terms that are the most similar in reference to the water cycle? 

Possible Answers:

Precipitation and percolation

Condensation and percolation

Transpiration and evaporation

Precipitation and runoff

Correct answer:

Transpiration and evaporation


Transpiration is the evaporation of water from plants. Both terms can be defined as the conversion of liquid water on Earth into atmospheric water vapor. Condensation is the formation of clouds from water vapor. Precipitation is the release of water from clouds down towards the earth in the form of rain, hail, sleet or snow. Percolation is the seeping of water through the ground into groundwater sources like aquifers. Runoff is excess water on the superficial soil layers that cannot percolate into the ground. 

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