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Ecosystems (Grade 6)

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Which list shows a possible order in which energy moves through an ecosystem?
  1. herbivore, carnivore, Sun, producer, decomposer
  2. Sun, producer, herbivore, carnivore, decomposer
  3. Sun, producer, predator, consumer, decomposer
  4. producer, Sun, carnivore, herbivore, decomposer
Which description is true about the organization of an ecosystem?
  1. Communities make up species, which make up populations.
  2. Populations make up species, which make up communities.
  3. Species make up communities, which make up populations.
  4. Species make up populations, which make up communities.
Which is a biotic factor that affects the size of a population in a specific ecosystem?
  1. average temperature
  2. type of soil
  3. number and kinds of predators
  4. concentration of oxygen
An ecosystem is best able to support a variety of organisms when
  1. organisms share food and habitats equally.
  2. competition for food is controlled by humans.
  3. the physical-space needs of organisms are met.
  4. organisms use the parts of the ecosystem differently.
Deer and zebra feed on grasses and other plants. Leopards and lions feed on deer and zebra. Which description is the role of deer and zebra in this ecosystem?
  1. producer
  2. carnivore
  3. decomposer
  4. consumer
In an ecosystem, sometimes more than one animal is a predator to the same animal. For example, the great barn owl and the the bald eagle both share a habitat, and they both hunt mice. Which answer explains how this relationship can work?
  1. They are both hunted by the red fox.
  2. The eagle migrates to other ecosystems.
  3. The owl hunts at night, and the eagle hunts during the day.
  4. There is an overpopulation of owls.
A non-native plant is introduced into a diverse, mature ecosystem in equilibrium. If the plant has no enemies and thrives in the ecosystem, how will it affect the community?
  1. The number of native species will decrease.
  2. The native species will become more like the new plant.
  3. The number of native species will increase.
  4. The number of native species will not be affected at all.
Mountain lions give birth to their young in the spring. How does this reproductive adaptation increase the young mountain lions' survival?
  1. There is less competition for warmth in spring.
  2. Predators only eat plants during spring.
  3. More food is available to the young during spring.
  4. Springtime temperatures make predators hibernate.
In 1994, an enormous amount of African farmland was devastated by a very large increase in the population of mice. The mouse population in some areas rose to as many as 195 mice per square meter. Which factor most likely contributed to such a large increase in the mouse population?
  1. mild climate and high crop production
  2. excessive heat and low snake population
  3. wet climate and no pesticides
  4. warm weather and cloudy skies
In an ecosystem, birds depend on insects to survive. If pesticides are spread to control the insect population, the bird population will most likely
  1. increase.
  2. decrease.
  3. decrease, then increase.
  4. increase, then decrease.
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