1. Which statement best defines competition in an ecosystem?
- A. One population directly hunts and consumes another population for energy.
- B. Two populations work together, and both benefit from the relationship.
- C. Two or more populations rely on the same scarce resource to survive.
- D. One population benefits from a host organism, which is harmed in the process.
2. If two species of birds compete for the same type of insect in a forest, what is the most likely immediate effect on Bird Species A if the population of Bird Species B suddenly increases?
- A. The population of Bird Species A will increase due to more available nesting sites.
- B. The population of Bird Species A may decrease due to less food availability.
- C. The availability of insects will increase for Bird Species A.
- D. The population of Bird Species A will be unaffected because they do not interact directly.
3. Imagine a pond where frogs eat dragonflies. If a new species of fish that also eats dragonflies is introduced, what is a likely long-term outcome for the frog population?
- A. The frog population will likely increase because the fish will eat other predators.
- B. The frog population will remain stable because frogs and fish live in different parts of the pond.
- C. The two species will interbreed and form a new hybrid species.
- D. The frog population may decline in number or be forced to find a different food source.
4. Which scenario provides the clearest example of competition?
- A. A bee gathers nectar from a flower, pollinating it in the process.
- B. Both hawks and owls hunt for mice in the same field.
- C. A snake constricts and eats a mouse.
- D. A fungus grows on a tree, absorbing nutrients and harming the tree.
5. Why is competition often described as an indirect effect between two populations?
- A. The competition only has a negative effect on one of the populations.
- B. The two populations are always physically separated by a large distance.
- C. The populations affect each other through their impact on a shared, limited resource, not necessarily by direct contact.
- D. The effects of competition are only visible after many generations have passed.
6. In a forest, gray squirrels and red squirrels both eat the same types of acorns. If a new disease significantly reduces the gray squirrel population, what is the most likely indirect effect on the red squirrel population?
- A. The red squirrel population will also decrease due to the spread of the same disease.
- B. The red squirrel population will likely increase due to more available acorns.
- C. The red squirrel population will remain unchanged because they are a different species.
- D. The red squirrels will begin eating different foods to avoid competition.
7. The change in one competitor's population size causes an 'indirect change' in the other. What is the primary mechanism for this indirect effect?
- A. An alteration in the availability of shared, limited resources.
- B. Direct physical conflicts between individuals of the two species.
- C. The transmission of genetic adaptations between the competing species.
- D. A shift in the climate that favors one species over the other.
8. Two species of birds in a coastal area compete for the same type of small fish. What event would most likely cause a decrease in the population of Bird Species B due to this competition?
- A. A large increase in the population of Bird Species A.
- B. A sudden increase in the population of the small fish they both eat.
- C. A sharp decline in the population of Bird Species A due to a virus.
- D. The arrival of a new predator that only preys on Bird Species A.
9. Which of the following scenarios best illustrates a competitive relationship between two species?
- A. A wolf pack cooperates to hunt a large moose for food.
- B. Coyotes and foxes in the same habitat both hunt the same types of small rodents.
- C. Mistletoe grows on an oak tree, absorbing nutrients directly from the tree's branches.
- D. Cleaner fish remove and eat parasites from the gills of a larger fish.
10. An ecologist observes two competing species of grasses, A and B, in a field. If a factor causes the population of Species A to steadily increase, what would a graph of the population of Species B most likely show during that same period?
- A. A steady decrease.
- B. A steady increase.
- C. No significant change.
- D. An initial spike then a crash.