Organisms
Impacts
Ecosystems
Relationships
Food Chains/ Food Webs
100
Which organism is a producer?
A frog
B mushroom
C grass
D lizard
C. Grass
100
How would the woodpecker population in a forest area most likely be affected if a housing development is built in that area?
A They would produce more offspring.
B They would change the color of their feathers.
C They would experience a decrease in the available food.
D They would experience a decrease in competition.
C. They would experience a decrease in the available food.
100
Which is an abiotic part of a coral reef ecosystem?
A. The algae
B. The corals
C. The temperature
D. The plants
C. The temperature
100
How have desert plants adapted to their environment?
A by limiting the use of sunlight
B by storing water
C by distributing certain nutrients
D by releasing water
B by storing water
100
A Consumer
200
Which is an example of a decomposer?
A a hawk
B a mouse
C a flower
D a mushroom
D. a mushroom
200
In a grassland ecosystem, if the population of eagles suddenly decreased, what will most likely be the effect on the rest of the ecosystem?
A The ecosystem will become overpopulated with snakes.
B There will be a decrease in the population of snakes in the ecosystem.
C The nutrition of the soil in the ecosystem will decrease.
D More types of plants will begin growing in the ecosystem.
A. The ecosystem will become overpopulated with snakes.
200
What is an ecosystem?
A community of living organisms interacting with each other and with their non-living environment.
200
Why can frogs and snakes live in the same garden?
A Both keep weeds out of the garden.
B Both help different plants to grow.
C Both occupy different niches.
D Both compete for water.
C. Both occupy different niches.
200
A food chain in an ecosystem includes blackberry bushes, deer, and wolves.
• Deer eat blackberries.
• Wolves eat deer.
If the population of wolves decreases, how will this affect the population of blackberry bushes?
A It will decrease because there will be fewer deer.
B It will increase because there will be fewer deer.
C It will decrease because there will be more deer.
D It will increase because there will be more deer.
C It will decrease because there will be more deer.
300
Which is most responsible for recycling dead plants and animals in an ecosystem?
A water
B bacteria
C fish
D insects
B. bacteria
300
As more people have moved to the beach, the sea turtle population has decreased. Which is most likely the cause of this decrease?
A tropical storms
B increase in predators
C habitat loss
D warmer temperatures
C. Habitat loss
300
What will be most affected if the decomposers in an ecosystem are removed?
A the spread of disease
B the availability of water
C the quality of soil
D the distribution of organisms
C the quality of soil
300
A small fish, called a cleaner fish, picks bits of food from a shark’s teeth. What can best be concluded about this behavior?
A It takes needed nutrition away from the shark.
B It helps both the cleaner fish and the shark.
C It removes food from inside the shark’s body.
D It helps the shark blend in with its surroundings.
B. It helps both the cleaner fish and the shark.
300
Which food chain is in the correct order?
A grasshopper → grass → snake → frog → hawk
B grasshopper → frog → hawk → snake → grass
C grass → grasshopper → frog → snake → hawk
D grass → grasshopper → snake → frog → hawk
C. grass → grasshopper → frog → snake → hawk
400
Which resource do decomposers return to the environment?
A light
B nutrients
C oxygen
D water
B. nutrients
400
Which will most likely cause a decrease in predator populations?
A an increase in prey populations
B a decrease in prey populations
C a decrease in decomposers
D an increase in producers
B. a decrease in prey populations
400
What would most likely result if all plants in an area were destroyed?
A Consumer populations would increase because more sunlight would reach the ground.
B Decomposer populations would increase because more sunlight would reach the ground.
C Consumer populations would decrease because plants provide them with water.
D Consumer populations would decrease because plants provide them with energy.
D Consumer populations would decrease because plants provide them with energy.
400
Which best explains why an ocean can support many different kinds of organisms?
A. Ocean populations are small, so different populations do not have to compete for resources.
B. Ocean organisms must eat other organisms to survive, so they live closer to one another.
C. Different ocean organisms have adapted different ways to get what they need to survive.
D. An ocean has more than enough resources for all the organisms living in it.
C. Different ocean organisms have adapted different ways to get what they need to survive.
400
This is a food chain that includes grass, a grasshopper, and a bird.
grass → grasshopper → bird
How is the grass in this food chain best described?
A It is a producer, because it makes its own food.
B It is a producer, because it is eaten by consumers.
C It is a consumer, because it gets energy from producers.
D It is a decomposer, because it breaks down sunlight.
A It is a producer, because it makes its own food.
500
Which best describes the role of a producer in an ecosystem?
A to use energy from the sun to make food
B to decompose dead organisms
C to eat other living organisms
D to feed on dead organisms
A. to use energy from the sun to make food
500
A simple food chain includes hawks, lizards, and insects. Which will most likely happen to the lizard and hawk populations if a pesticide is sprayed to kill the insects, and the lizard and hawk populations cannot find other food in this ecosystem?
A Both the lizard population and the hawk population will increase.
B Both the lizard population and the hawk population will decrease.
C The lizard population will increase, but the hawk population will decrease.
D The lizard population will decrease, but the hawk population will increase.
B. Both the lizard population and the hawk population will decrease.
500
Which has the greatest effect on the amount of salt in a salt marsh?
A the number of animals living in the marsh
B the closeness of the marsh to the ocean
C the depth of the water in the marsh
D the temperature of the water in the marsh
B the closeness of the marsh to the ocean
500
A disease causes almost all the rabbits in an ecosystem to die.
Explain two ways this could affect other organisms in the ecosystem.
- Predators (such as foxes or eagles) may decrease because they have less food.
- Plants that rabbits usually eat may increase.
- Other herbivores may have less competition for food.
- The food web becomes unbalanced.
500
Which would most likely cause a decrease in a population of herbivores?
A an increase in the number of producers
B a decrease in the types of decomposers
C an increase in the types of plants
D an increase in the number of carnivores
D an increase in the number of carnivores