Ecosystem 1
What is an ecosystem?
An ecosystem is the interactions of organisms and their environment.
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
Which classification best describes herbivores?
A. producers
B. consumers
C. predators
D. decomposers
consumers
Which type of animal usually eats both producers and consumers?
A an omnivore
B a carnivore
C a herbivore
D a predator
An omnivore
Which is most responsible for recycling dead plants and animals in an ecosystem?
A. water
B. bacteria
C. fish
D. insects
Bacteria
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
habitat loss
In an ocean ecosystem, if the population of sharks suddenly decreased, what would most likely happen to the rest of the ecosystem?
a. The ecosystem would become overpopulated with fish.
b. The ecosystem would see a decrease in the population of fish as well.
c. The nutrition of the soil would decrease.
a. The ecosystem would become overpopulated with fish.
Which is the relationship where both organisms benefit?
a. commensalism
b. mutualism
c. parasitism
d. predation
mutualism
Which organism is a producer?
A frog
B mushroom
C grass
D lizard
Grass
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 available food.
D. They would experience a decrease in competition
They would experience a decrease in available food.
What is a decomposers and how do they help the ecosystems?
Decomposer are, organisms that break down dead or decaying organisms. Decomposers help by turning dead organisms into nutrients for the soil.
A mouse eats seeds and insects. Which best describes the role of the mouse?
A. consumer
B. decomposer
C. herbivore
D. producer
Consumer
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
the quality of soil
How much energy passes from one trophic level to the next?
a. 100%
b. 50%
c. 10%
d. 20%
c. 10%
What is the difference between biotic and abiotic factors in an ecosystem?
Biotic factors are living and abiotic factors are not living.
What is a food chain?
A food chain is a series of organisms dependent on each other for energy.
How would a deer population most likely be affected if a houses started being built in the forest it lives in?
a. The deer would produce more offspring
b. The deer would change the colors of their fur
c. The deer would experience a decrease in available food
d. The deer would experience a decrease in competition
c. The deer would experience a decrease in available food
What would happen in an ecosystem if the main producer organism was removed?
A. The consumers would increase
B. New producers will come in
C.The consumers would decrease
D. The predators would increase
If the producer was removed, the population of the organism that consumes the producer would start to decrease.
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.
The ecosystem will become overpopulated with snakes.
Arrange the following organisms in order for a food chain: fox, grass, mouse
Grass---->Mouse------>Fox
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.
Consumer populations would decrease because plants provide them with energy.
What are some abiotic and biotic factors of a lake ecosystem?
Biotic
Fish, Algae
Abiotic
Soil, Water
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.
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?
It is a producer, because it makes its own food.
Write out an example of a food chain with at least 3 organisms.
Answers May Vary
Example: Grass -> Grasshopper -> Bird