Ecosystem Populations

Which statement BEST explains the flow of energy as it moves through the different levels?

• Energy decreases as it is lost as heat to the environment.

• Energy increases as it is gained from the environment.

• Energy is unavailable because it is used up by the organisms at Level 1.

• Energy is transferred as it is produced by organisms in the next level.

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NGSS.MS-LS2-3

Many different organisms live in Amanda’s garden. The diagram shows a simple food web of some of the organisms in her garden. Predation helps maintain the stability of an ecosystem. Which statement BEST describes how this garden ecosystem can benefit from the presence of snakes?

• The snakes provide an energy source for the moles.

• The snakes consume the mice best adapted to their environment.

• The snakes eat moles, which allows the population of mice to increase.

• The snakes keep the mice from overpopulating, which could deplete plant resources.

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NGSS.MS-LS2-2

NGSS.MS-LS2-4

What impact do resources, such as sunlight and water, have on a forest ecosystem?

• They limit the carrying capacity of the ecosystem.

• They increase habitat areas for new organisms entering the ecosystem.

• They decrease the number of diseases resulting from overpopulation.

• They alter the rate of photosynthesis, resulting in more oxygen being produced.

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NGSS.MS-LS1-6

NGSS.MS-LS2-1

Changes to abiotic factors in an environment can impact biotic factors. Which statement is the BEST example of this situation?

• Heavy rainfall increases soil erosion.

• Melting glaciers cause sea levels to rise.

• Cold temperatures cause rocks to weather.

• Drought conditions increase competition among consumers.

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NGSS.MS-LS2-1

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An ecological population can be defined as

• A living thing such as a plant or animal.

• A system comprising all the biotic and abiotic factors in an area and all the interactions among them

• All of the populations of different species in a particular area. All the populations in an ecosystem.

• A group of interacting organisms of the same species. A group of interbreeding organisms (species) living in the same area

A group of the same type of organisms living in the same place at the same time.

• threatened species

• populations

• abiotic factors

• limiting factor

same species same area

• habitat

• biome

• community

• population

Dead matter and waste would pile up without which type of organism?

• decomposer

• consumer

• producer

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NGSS.MS-LS2-3

A pride of lions stalks, tackles, and kills an antelope. Which is best being demonstrated?

• predation

• mutualism

• cooperation

Which best describes mutualism?

• Ticks live and feed on dogs and other animals’ blood to survive.

• Mushrooms send out long, underground structures which allow them to grow in other areas.

• Ants attack animals that try to feed on the acacia tree, and the ants feed on the nectar of the tree.

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NGSS.MS-LS2-2