Ecosystem Cycles

What are the four most important materials needed by living organisms?

• water, carbon, oxygen, nitrogen
• water, food, oxygen, carbon
• water, carbon, nitrogen, phosphorous
• water, carbon, food, phosphorous

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This is essential to living organisms, it is found in nucleic acid and amino acids.

• Nitrogen
• Carbon
• Water
• Phosphorous

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This is part of nucleic acids, ATP, and helps form animals' bones and teeth.

• Nitrogen
• Carbon
• Water
• Phosphorous

The conversion of nitrate to nitrogen gas is called what?

• nitrification
• renitrification
• denitrification
• unnitrification

The three steps of the water cycle include:

• condensation, precipitation, filtration
• filtration, irrigation, evaporation
• precipitation, condensation, evaporation
• precipitation, filtration, evaporation

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NGSS.MS-ESS2-4

Which of these steps is part of the nitrogen cycle AND the phosphorous cycle?

• it starts off inside underwater rocks and dirt
• bacteria convert it into organic compounds
• animals leaving waste and death and decay release it back into the soil
• rain water and ocean waves break off pieces, putting it back into the ecosystem

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NGSS.MS-LS2-3

Which of these is a step in the carbon cycle, the nitrogen cycle, and the phosphorous cycle?

• condensation
• decomposition
• respiration
• photosynthesis

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NGSS.MS-LS2-3

An organism that needs to eat other organisms to obtain energy is known as a:

• Autotroph
• Producer
• Consumer
• Mutualist

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What does a food chain represent?

• How all living organisms within a habitat are connected.
• All of the things that a particular animal eats.
• How plants create their own food.
• A single path of energy transfer within a habitat.

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NGSS.MS-LS1-7

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The arrows in a food chain or web represents what?

• They point to the organism that is being eaten.
• It shows how sunlight flows within an ecosystem.
• They show what direction the energy is flowing between organisms. 
• They represent how water is transferred within a habitat.

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NGSS.HS-LS2-3