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Human Effects on Ecosystems
How Species Affect One Another
Ecosystem Changes
How Ecosystems Work
Vocabulary
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 available food. D They would experience a decrease in competition.
C - They would experience a decrease in available food.
100
Which term defines animals that obtain food by hunting other animals?  a. predators b. prey c. producers d. scavengers
a. predators
100
What would happen if all producers in an ecosystem were removed?   a. All forms of life in that ecosystem would die. b. They would all be replaced in that ecosystem. c. Only the decomposers would die in that ecosystem. d. Only the carnivorous consumers would die out in that ecosystem.
a. all forms of life in that ecosystem would die.
100
What is the primary source of energy in many ecosystems?   a. water   b. the Sun   c. consumers   d. producers
b - the Sun
100
Place where an organism lives
What is a habitat?
200
Which is one way people often destroy animal habitats?   a. by building new homes   b. by recycling waste products c. by producing new energy sources   d. by creating new varieties of plants
a - by building new homes
200
12. A zebra eats grass and then is eaten by a lion. Which is the predator in this situation?   a. grass   b. lion   c. sun   d. zebra
b - the lion
200
Which best explains how an ecosystem supports a variety of organisms?   a. Most organisms are completely independent.   b. Organisms sometimes die out and are replaced.   c. All organisms are able to live in separate habitats.   d. Organisms use parts of the ecosystem differently.
d. Organisms use parts of the ecosystem differently.
200
An organism that is killed and eaten by another organism
What is prey?
300
Which is most likely responsible for the pollutants that enter a wetland ecosystem after a heavy rain? a. animal waste    b. human chemical use c. atmospheric conditions d. changes in daily temperatures
b. human chemical use
300
Which consumer in a grassland ecosystem would be considered both predator and prey?   a. a grasshopper, because it eats grass and is eaten by birds   b. a rabbit, because it eats snakes and is eaten by deer   c. a snake, because it eats mice and is eaten by hawks   d. an earthworm, because it eats dead animals and is eaten by birds
c - a snake, because it eats mice and is eaten by hawks
300
Which would most likely happen if all the soil in an ecosystem washed away?   a. Most of the plants would die.   b. Most of the plants would grow in rocks. c. All animals would become carnivores.   d. All animals and plants would relocate.
a - most of the plants would die
300
Which best explains why predators need other animals within an ecosystem?   a. They depend on them for food.   b. They depend on them for water.   c. They depend on them for protection.   d. They depend on them for competition.  
a. They depend on them for food.
300
An animal that hunts other animals for food
What is a predator?
400
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
400
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
400
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
400
An owl gets its energy from a field mouse it eats. From which food source did the mouse most likely get its energy? a. soil b. water c. sun    d. grass
d. grass
400
Humans harm natural habitats (cutting down trees, building houses) and causes a decrease in animals/plants
What is habitat reduction?
500
Which is a possible result of humans destroying habitats? a. an increase in available niches b. an increase in the number of prey c. an increase in the number of predators    d. an increase in the number of endangered species
d. an increase in the number of endangered species
500
Which will most likely happen to the grasshopper population if the grass population decreases?   a. The grasshopper population will increase because there will be less competition.   b. The grasshopper population will decrease because there will be less food available.   c. The grasshopper population will increase because there will be more food available.   d. The grasshopper population will decrease because there will be an increase in the predator population.
b - the grasshopper population will decrease because there will be less food available
500
Which would most likely increase the number of squirrels living in an area?   a. cutting down trees that serve as habitats for squirrels   b. planting trees that produce nuts squirrels do not eat   c. reducing the number of animals that hunt and kill squirrels   d. removing all of the food sources for squirrels from the area
c- reducing the number of animals that hunt and kill squirrels
500
Which best describes the result if the number of lilypads in a pond ecosystem increases?   a. Consumers of the lilypads would increase because of a larger food source.   b. The lilypads would prevent fish from absorbing the sun’s energy.   c. Consumers of the lilypads would decrease because of increased competition.   d. The lilypads would use the oxygen in the air, which would lower the number of consumers.
A. Consumers of the lilypads would increase because of a larger food source.
500
Largest number of individuals of a population that an environment can support
What is carrying capacity