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Chapter 8
Changes in an Ecosystem
29
Science
5th Grade
01/23/2013

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Term
problems that invasive species can bring to an ecosystem
Definition
1. increased number of predators of a native species
2. diseases
3. increased competition for food and water
Term
2 parts of the carbon cycle
Definition
1. photosynthesis
2. respiration
Term
four parts of the Water Cycle
Definition
1. precipitation
2. transpiration
3. evaporation
4. condensation
Term
seasons
Definition
Some areas of the earth have four, but
other areas have only two.
Term
cycle
Definition
a regular pattern of change
Term
stress
Definition
any physical hazard to life caused by having too much or too little of things needed for life
Term
temperature
Definition
changes as the seasons change in many parts of the earth
Term
drought
Definition
does not have a definite beginning or ending
Term
3 natural stresses
Definition
fires
floods
droughts
Term
consumers
Definition
get nitrogen compounds by eating other animals and plants
Term
nitrogen
Definition
has to be combined with other elements before it can be used
Term
Nitrogen
Definition
most often changed into usable compunds by bacteria
Term
water
Definition
needed for the water cycle and for the carbon cycle during photosynthesis
Term
floods
Definition
occur whenever an ecosystem receives more water than it can store or use
Term
drought
Definition
occurs whenever an ecosystem receives less water than it needs
Term
precipitation
Definition
part of the water cycle and also carries nitrogen compounds down to earth
Term
native species
Definition
plant and animal species that originally live in an ecosystem
Term
3 man-made stresses
Definition
pollution
habitat destruction
excessive hunting and fishing
Term
ground water
Definition
precipitation that has soaked into the ground and is stored there
Term
habitat destruction
Definition
probably the largest man-made stress
Term
seasons
Definition
regular divisions of the year
Term
invasive
Definition
species that are not native to an ecosystem and can cause harm
Term
succession
Definition
the gradual changes in the populations of organisms in an ecosystem
Term
threatened
Definition
when a species' population could become endangered in the near future
Term
endangered
Definition
when a species' population is so small that the species may soon become extinct
Term
respiration
Definition
when people and animals breathe in oxygen and breath out carbon dioxide
Term
transpiration
Definition
when plants release water vapor into the air
Term
photosynthesis
Definition
when plants take in carbon dioxide and release oxygen
Term
extinct
Definition
when the last known member of a species dies
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