Unit 2 Review Semester Exam

Unit 2: Biodiversity

SEMESTER EXAM REVIEW

Fill in the Blanks

Describe an ecosystem service that PROVIDES natural resources to humans.

Water Cycle

Overview

Ex: precipitation = atm. (gas) → land or
surface water (liquid)

Energy from sun drives the H2O cycle

State of matter (solid/liquid/gas) as well as
where water is moving are key in H2O cycle

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Ex: heat from sun causes liquid water in
ocean to become a gas (evaporation) in atm.

Ocean = largest water reservoir
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Ice caps & groundwater
are smaller reservoirs,
but contain fresh,
useable water for
humans

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Fill in the Blanks

Describe one of the three levels of biodiversity.

Nitrogen Cycle Overview

N = critical plant & animal nutrient

Atmosphere = main N reservoir

Mvmnt of N containing molecules
between sources & sinks/reservoirs

Sources release N into atmosphere; sinks take N
out of the atmosphere in increasing amounts

N in atm. exists mostly as N2 gas, not useable
by plants or animals

All living things need N for DNA & amino acids
to make proteins

N reservoirs hold N for relatively short period
of time compared to C cycle

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-Ex: plants, soil, atmosphere

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