WorksheetsGR 5 U1-L 6 What Makes an Ecosystem Healthy or Unhealthy?
Total questions: 14
Worksheet time: 7mins
When there are fewer predators in an ecosystem the number of prey -
decrease slowly
stay the same
increase quickly
If just one species in a food chain disappears -
the ecosystem will remain balanced
all of the other organisms will have more food
other organisms that depend on that species will not have their needs met
In a healthy ecosystem -
many different kinds of organisms can meet their needs
there is only one large group of a single type of organism
producers are not needed
When too much algae grows in a pond -
the tadpoles and fish are happy
the algae in the pond starts to die and then there is more oxygen in the pond
the decomposers break down the dead algae which causes the oxygen levels to go down
In all ecosystems -
there is always plenty of food
all parts affect each other
the needs of all species are met
An organism that is captured and eaten is -
a producer
the prey
the predator
If an ecosystem is healthy, the number of
prey is greater than predators
predators is greater than prey
predators and prey are balanced
______________ can cause an environment to be unhealthy.
Too many of one type of organism
Too few of one type of organism
Death of one type of organism
all of the above
A nonliving part of an ecosystem that can change the living parts is -
increase in birds
death of plant life
change in weather
In a HEALTHY ecosystem, the predator-prey relationship is:
not important
always changing
balanced
What do the arrows in a food chain represent?
nothing
what arrows?
the flow of energy from the prey to the predator
How would the death of a first level consumer change an ecosystem?
the ecosystem would not change
the second level consumer would decrease
the plants would decrease
What would happen if the number of moose on Isle Royale decreased?
The wolves begin to raise offspring.
The number of wolves increases.
The number of wolves decreases.
The amount of fir trees decreases.
Which of the following NONLIVING parts of an ecosystem can change the living parts?
increase in insects
change in weather
death of plant life
decrease in prey
