4th Grade Science - Chapter 4 Changes in Ecosystems

21 cards

Book: Science by Scott Foresman\nChanges in Ecosystems\nVocabulary and Test Review


 
  
Created Oct 21, 2012
by
makklynn

 

 
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1
What are 3 key things about Ecosystems?
 
They are healthy when their parts are in balance.

All living things are interrelated...
2
What happens when the number of organisims in a population increases?
 
All of the other living things population in the ecosystem will increase.
3
What are two things that might prevent a plant population from growing in size?
 
There are too many plant eating animals in the ecosystem.

There hasn't been...
4
Competition
 
When two or more species must use the same limited resources.
5
What are two behaviors that help animals avoid or reduce competition?
 
Living in groups

Hunting in the morning or evening.

Two different...
6
Parasite
 
The organism in a relationship that is helped by the other.
7
Host
 
The organism in a relationship that is harmed by the other.
8
What might happen to a parasite if its host were to die?
 
The parasite may die because it does not have any food from the host.
9
Succession
 
Gradual Change from one community of organisms to another.
10
Give an example of succession. 
 

Usually occurs in stages.

Example: Bare land becomes grassland, grassland...
11
Extinct
 
When a species dies out and is gone forever.
12
What are 3 reasons that an animal may become extinct?
 
Changes in the earth's environment:
Climate changes
volcanoes
hurricanes
13
Endangered Species
 
Populations of a species that have been reduced so much that they are in danger of becoming...
14
Can endangered and threatened species sometimes lave an area to search for a more suitable...
 
YES
15
What are some examples where rapid change can help an ecosystem?
 
A forest fire - clears away dead plant matter and assists trees to creat a new forest by forcing...
16
Name two processes that change an environment over a very long period of time.
 
Erosion
Forest regrowth
canyons being created
lakes being created
17
Name two processes that change an environment rapidly.
 
Forest Fires
Hurricanes
Floods
Volcanic Eruptions
18
What are some of the examples of ways that people disturb the balance in the ecosystem?
 
Cutting down trees to make houses and paper.
Clearing prairies to plant crops or build...
19
What are some examples of air pollution?
 
Automobile fumes
Large factories that produce smoke
Chemicals that farmers spray...
20
What are some examples of water pollution?
 
Chemicals that get into the rivers, lakes and oceans.
Sewage
Oil Spills
21
Hazardous Waste
 
Substances that are harmful to humans and other organisms.

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