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- 1. Multiple Choice
A food web diagram is provided. Which of the following organisms depend only on producers for energy?
diatoms
shrimp
amphipods
squid
- 2. Multiple Choice
The energy organisms need to live and grow first enters the ecosystem when -
Plants take in light energy from the sun.
decomposers break down dead organisms.
primary consumers eat plants for food.
secondary consumers eat primary consumers.
- 3. Multiple Choice
Matter is passed from living part of an ecosystem to the non-living part when which of the following takes place?
Plants absorb gases
plants decompose
animals eat plants
animals drink water
- 4. Multiple Choice
A food web diagram is provided. Bases on the diagram, it is reasonable to conclude that matter could follow which of the following paths as it cycles through this ecosystem?
Sun -grass- robin
plant seed - field mouse - robin
Eagle - deer - plant seeds
Grass - deer - mountain Lion
- 5. Multiple Choice
Which of the following observations would support the claim that as plants absorb sunlight to make food, they release oxygen into the environment?
Oxygen concentration in the atmosphere was much higher millions of years ago when different plants existed.
When plants are kept in a sealed environment, the concentration of carbon dioxide steadily goes down.
Plants that kept under conditions of total darkness fail to grow normally and eventually will die.
The oxygen concentration in a pond with many plants increases during the day and decreases at night and on cloudy days.
- 6. Multiple Choice
The graph below shows populations, over several years, for two animals that share a habitat. Foxes are mammals that hunt for food, and grouse are birds, a common prey animal of foxes. According to the data, in which year did the population of foxes show a decrease that is most likely the result of a decrease in the availability of a source of food?
2003
2005
2008
2012
- 7. Multiple Choice
An increase in the population of an organism would most likely be associated with which of the following?
A series of sever weather events in the habitat
A decrease in necessary resources available
An expansion of suitable living space.
An increase in animals that prey on the organisms.
- 8. Multiple Choice
The milkweed plants serves an important role in the life cycle of the monarch butterfly. Adult butterflies lay their eggs in the milkweed, and then caterpillars eat the same plant during their development. Based on the relationship between the monarchs and milkweed, which of the following trend would be predicted when looking at the data on the population of these two organisms.
Population decreased in monarch butterflies should follow population decreased in milkweed.
Population of monarch butterflies should remain constant when milkweed population decreases.
Population increase in monarch butterflies should follow population decrease in milkweed.
Population of milkweed should remain constant when monarch butterfly population increases.
- 9. Multiple Choice
Eagles and grizzly bears live together in the same habitat. There will be competition between the eagles and the grizzly bears only if which of the following is true?
Grizzly bears hibernate during the winter while eagles reamin active.
Pesticides in the fish population affect eagles eggs and decrease their population.
Both grizzly bears and eagles feed on the same species of salmon.
Laws prevent humans from being able to hunt Eagles or grizzly bears.
- 10. Multiple Choice
An increase in which of the following factors is likely to contribute to competition between two members of the same species living in a certain habitat?
Available food resources
Population of the species
Annual rainfall
Overall size of the habitat
- 11. Multiple Choice
The population of deer in a certain area is monitored over a period of six years. The data is represented in the graph provided. Which of the following is the most likely explanation for the change in population in 2009?
Wolves, which prey on deer, were being hunted more than usual.
Rainfall in the previous spring was higher than the yearly average.
Humans introduced grazing animals that feed on the same plants as the deer.
More insects that pollinate flowering plants move into the habitat.
- 12. Multiple Choice
A student wants to investigate competition between two organisms. FOr the investigation, it is most important that the student should choose organisms that .....
reproduce at the same rate.
are both active during the day.
have the same adaptations.
require the same resources.
- 13. Multiple Choice
These graphs show how two factors for a certain region changed over time: the number of predators that prey on mice and number of plants of the type that the mice eat. Based on the information from these graphs, in which of the following years would the population of mice have been the highest?
1996
1998
2000
2002
- 14. Multiple Choice
The table provides information on population density of mayflies, a kind of insect, in a certain area over a few years. Based on the population density data provided, which data provides evidence that there was a significant increase in the population of birds that prey on mayflies.
2005
2006
2007
2008
- 15. Multiple Choice
An example of a predator and a prey species for four separate ecosystems is provided below. Which of the following would demonstrate and appropriate prediction for the changes to one of the populations of organisms due to a predator/prey interaction?
when a population of sharks decrease because of fishing, the population of small fish will decrease.
After a period of heavy rainfall and warmer temperatures, the population of mosquitos will increase.
During hunting season, when many deer are killed by hunters, the mountain lion population will decline.
When abundant resources allow the population of mice to increase, the population of snakes will decrease.
- 16. Multiple Choice
Which of the following describes a symbiotic relationship?
Owl and field mouse
Oak tree and pine tree
Spider and fly
Shark and remora fish
- 17. Multiple Choice
information on brown tree snakes is provided along with information on the island of Guam. Brown tree snakes were first brought to Guam in 1059. Which of the following would provide evidence that the change to this environment brought about by the introduction of the brown tree snake has had an effect of the populations of organisms that lived on Guam?
Any of the military bases on Guam were closed in the 1980's
Several other species of snakes were known to live on Guam before 1950.
THe population of lizards on Guam in 1960 was very small.
The longest brown tree snake ever found on Guam measured three meters in length.
- 18. Multiple Choice
A physical disruption to an ecosystem occurs when a highway was built through a forest. Which of the following would provide evidence that the addition of a highway to this forest affected populations?
THe amount of water runoff from higher elevations increased after the highway was built.
The trees that were not cut down during the construction of the highway continued to grow.
There were fewer species of nesting birds living in the forest after the highway was built.
A greater area of the forest floor was exposed to the sunlight after the highway was built.
- 19. Multiple Choice
The ecosystem with the greatest biodiversity is the one that has the greatest:
variety of living things.
average annual rainfall
coverage of land area
elevation above sea level.
- 20. Multiple Choice
Changes to an ecosystem's biodiversity can have a direct effect on humans because humans -
inhabit all areas of the Earth's ecosystem.
use minerals from the ground to make things
rely mostly on solar power for energy.
depend on the Earth's natural resources.
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