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- 1. Multiple Choice
If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?
The population of deer will increase.
The population of deer will decrease.
- 2. Multiple Choice
What will most likely happen to a herbivore if there is a drought and most of the plant life dies?
The population will not change.
The population will decrease due to a lack of food.
- 3. Multiple Choice
A forest where deer live is cleared to build houses for people. Which best describes how the number of deer will change after the land is cleared?
The number of deer will increase.
The number of deer will decrease.
- 4. Multiple Choice
Which would a drought most likely affect?
all organisms in a particular ecosystem
only the plants in a particular ecosystem
- 5. Multiple Choice
Which of these organisms is a producer in a marine ecosystem?
fish
gull
algae
- 6. Multiple Choice
Which is an example of parasitism?
cat and mouse
human and tapeworm
- 7. Multiple Choice
Which term best describes two predators living in the same habitat who feed on the same prey?
coexistence
competition
- 8. Multiple Choice
Consider this relationship: the stinging arms of the sea anemone protect the hermit crab and the movement of the hermit crab brings food to the sea anemone. Which best describes the relationship between the sea anemone and the hermit crab?
commensalism
mutualism
- 9. Multiple ChoiceDead matter and waste would pile up without which type of organism?decomposerconsumerproducer
- 10. Multiple Choice
By which process is water taken from the ocean to form clouds?
transpiration
evaporation
- 11. Multiple Choice
Which best explains the role of plants in the carbon cycle? (Hint: PHOTOSYNTHESIS!)
Plants take in oxygen and release carbon dioxide.
Plants take in carbon dioxide released by other organisms.
- 12. Multiple Choice
Which shows the correct flow of energy through this simple food chain?
fox → grass → rabbit
grass → rabbit → fox
- 13. Multiple Choice
After decomposers break down decaying organisms, which directly uses the resulting nutrients?
animals
plants
- 14. Multiple Choice
Which of these is an abiotic element of a desert ecosystem?
sand
cactus
- 15. Multiple Choice
In a tropical rainforest, shrubs and plants grow better in areas where a canopy tree has fallen. Which MOST likely occurs in the area where the tree falls that helps the plants and shrubs grow taller?
a decrease in competition for sunlight
a decrease in the amount of rainfall
- 16. Multiple Choice
Which organism in the food web has the least amount of energy available?
eagle
grass
- 17. Multiple Choice
Which best describes mutualism?
Ticks live and feed on dogs and other animals’ blood to survive.
Ants attack animals that try to feed on the acacia tree, and the ants feed on the nectar of the tree.
- 18. Multiple Choice
Two different species of birds live in one particular spruce tree. Which would best allow the two bird species to coexist in the same tree?
They are genetically unlike.
They live in different parts of the tree.
- 19. Multiple Choice
The organisms shown live in the same habitat.
Which BEST describes the exchange of energy between the organisms?
Each organism obtains energy from the environment.
One organism obtains energy from the environment, while the others obtain energy by eating other organisms.
- 20. Multiple Choice
Which statement BEST explains why only 10% of the energy produced is transferred to the next trophic level?
The energy is lost as heat to the environment.
Amount of energy remains the same but in different forms.
- 21. Multiple Choice
If two birds lived in the same tree, and we trying to occupy the same niche, what would be the most likely result?
An increase in competition between the two birds.
An increase in food availability in the tree.
- 22. Multiple Choice
In a food pyramid, which best explains why the number of organisms decreases from one trophic level to the next?
Consumers at the top level require more energy than the lower-level consumers.
The consumers are feeding on smaller organisms that have less energy.
- 23. Multiple Choice
Which would best allow a species to survive environmental changes?
genetic diversity
low mutation rate
- 24. Multiple Choice
Which best explains the importance of nitrogen in the cycling of energy and matter?
Nitrogen decreases protein production in plants.
Nitrogen increases protein production in plants.
- 25. Multiple Choice
What happens to a population and to competition when there is a reduction of living space?
The population increases as competition decreases.
Competition strengthens while the population contracts.
- 26. Multiple Choice
Which best determines the number of wolves that can live in an area?
the number of birds living in the area
the amount of food available in the area
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