Cycling of Matter and Energy

The trophic pyramid is a triangular shape because

• 90% of energy is lost to heat, movement, and survival, and only 10% of energy goes to the next level

• People see the top of the pyramid so it is important to know the keystone species.

• 10% of energy is lost to heat, movement, and survival, and only 90% of energy goes to the next level

• the top of the pyramid is the pinnacle organism of an ecosystem

Tags

NGSS.MS-LS2-3

Photosysnthesis and respiration are important because

• they make mutualism possible

• they are the building blocks of life

• they are the 6 characteristics of life

• they cycle matter and energy between autotrophs and heterotrophs

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which level would have the most biomass?

• Producers

• Primary consumers - herbivores

• Secondary consumers- carnivores

• Quaternary consumers- Apex Predators

The overlapping of food chains results in a ________.

• woven chain

• braided chain

• food web

• food nest

Tags

NGSS.MS-LS2-3

Students designed an experiment to model the carbon cycle. The students combined water & carbon dioxide-producing disks in a sealed flask. The flask represented earth's atmosphere, and the lamp represented the sun.

Which component can be added to the flask to reduce the concentration of carbon dioxide in the model atmosphere created by the discs?

• Bacteria to use carbon during nitrification.

• Plants to absorb carbon in the process of photosynthesis.

• Snails to use carbon through cellular respiration.

• Mushrooms to absorb carbon during decomposition.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The diagram shows the flow of organic molecules through an ecosystem. One process that occurs in this ecosystem is labeled X, and another that occurs is labeled Y.

Which two processes are identified as X and Y?

• X: respiration

  Y: predation

• X: adaptation

  Y: decomposition

• X: fermentation

  Y: nitrogen fixation

• X: decomposition

  Y: respiration

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which statement is an example of how carbon moves through a food chain as part of the carbon cycle?

• Producers release carbon dioxide, and consumers take it in.

• Producers take in carbon dioxide, and consumers release it.

• Producers take in carbon from the soil, and they release it when they decompose.

• Producers release carbon into the soil, and consumers take it in from the soil.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Label the diagram of the carbon cycle

f

g

h

e

d

c

b

a

feeding

Atmospheric carbon dioxide

fossilization (fossil fuels)

combustion

photosynthesis

decomposition

cellular respiration

CO₂ dissolved in water

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The process in which nitrogen circulates and is recycled is called

• The nitrogen cycle

• The carbon cycle

• The water cycle

• The phosphorus cycle

Tags

NGSS.MS-LS2-3

These organisms break down dead things.

• Consumers

• Producers

• Decomposers

• Rotters