STANDARD 2 review MODULE 7
Objective 3 a.) Describe specific examples of how humans have changed the capacity of an environment to support
specific life forms (e.g., people create wetlands and nesting boxes that increase the number and range of wood ducks,
acid rain damages amphibian eggs and reduces population of frogs, clear cutting forests affects squirrel populations,
suburban sprawl reduces mule deer winter range thus decreasing numbers of deer).
c.) Infer the potential effects of humans on a specific food web.
d.) Evaluate and present arguments for and against allowing a specific species of plant or animal to become extinct, and
relate the argument to the of energy flow in an ecosystem.
Learning Activity:
Differentiated Reading and Multimedia Activity
STANDARD 2 FORMATIVE 7 ESSENTIAL QUESTIONS
1. Using this foodweb describe what will happen to 3 other populations if the grasshopper population
goes extinct from pesticide poisoning?
2. This is kind of a trick question. Is extinction always bad? EXPLAIN your response.
3. Give at least one example of an organism going extinct. Then explain at least one other animal in the
same environment that might benefit by that organism going extinct. Then provide a drawing that will
illustrate this relationship.
STANDARD 2 FORMATIVE 7 CONTENT PRACTICE QUIZ
1. Study the food web below. Which of the following best describes an outcome if humans overuse DDT
and the owl population goes extinct?
A. more berries because more squirrels because no owls
B. less grasshoppers because more frogs because no owls
C. more grasshoppers because less frogs because no owls
D. less foxes because more frogs because no owls
2. What best describes how humans influence populations and foodwebs.
A. Humans are bad for populations
B. Humans are good for populations
C. Humans may cause increases or decreases in populations
D. Humans have no effect on populations
3. What best explains extinction of an organism relative to foodwebs and populations?
A. extinction is always bad for organisms in a food web
B. extinction does not have any effect on organisms in a food web web
C. extinction is always good for all organisms in a food
D. extinction may benefit some organisms and harmful to other organisms
4. Study the food web below. Scientists believe that some chemicals called retinoids are harming the
development of frog eyes. As a result the population has been drastically declining. If this continues it
is possible that certain frog species could go extinct. What best describes what could happen if frog
populations disappear?
A. more grasshopers because no frogs eating them
B. less grasshoppers because no frogs eating them
C. more snakes because less frogs for food
D. more owls because less frogs for food
STANDARD 2 FORMATIVE 7 ESSENTIAL QUESTIONS KEY
1. Using this foodweb describe what will happen to 3 other populations if the grasshopper population goes
extinct from pesticide poisoning?
1.) The frog population may decrease
because of less food in the form of
grasshoppers.
2.) with less frogs there may be less fox
because frogs are a food source for fox.
3.) with less fox there may actuall be more
rabbits because there would be less
predators (the fox) eating them
2. This is kind of a trick question. Is extinction always bad? EXPLAIN your response.
Not always for instance the extinction of the grasshopper above actually could help increase the population of
rabbits. So extinction is bad for some, but could be good for others because of food web relationships.
3. Give at least one example of an organism going extinct. Then explain at least one other animal in the same
environment that might benefit by that organism going extinct. Then provide a drawing that will illustrate this
relationship. If snakes when extinct the mice they feed on might actually get bigger because there are less
predators eating them.
STANDARD 2 FORMATIVE 7 CONTENT PRACTICE QUIZ KEY
1. Study the food web below. Which of the following best describes an outcome if humans overuse DDT and the
owl population goes extinct?
A. more berries because more squirrels because no owls
B. less grasshoppers because more frogs because no owls
C. more grasshoppers because less frogs because no owls
D. less foxes because more frogs because no owls
2. What best describes how humans influence populations and foodwebs.
A. Humans are bad for populations
B. Humans are good for populations
C. Humans may cause increases or decreases in populations
D. Humans have no effect on populations
3. What best explains extinction of an organism relative to foodwebs and populations?
A. extinction is always bad for organisms in a food web
B. extinction does not have any effect on organisms in a food web
C. extinction is always good for all organisms in a food
D. extinction may benefit some organisms and harmful to other organisms
4. Study the food web below. Scientists believe that some chemicals called retinoids are harming the development
of frog eyes. As a result the population has been drastically declining. If this continues it is possible that certain
frog species could go extinct. What best describes what could happen if frog populations disappear?
A. more grasshopers because no frogs eating them
B. less grasshoppers because no frogs eating them
C. more snakes because less frogs for food
D. more owls because less frogs for food