Cycles in the Ecosystem

The source of energy for all living things is the...

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NGSS.MS-LS1-6

What is the niche, or role of a decomposer?

• make and provide food for consumers

• provide energy to producers

• break down the waste

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NGSS.MS-LS2-3

What percent of the air consists of nitrogen gas?

• 78%

• 50%

• 33%

• 68%

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NGSS.MS-ESS2-5

True or False
As part of the carbon cycle, plants use oxygen for photosynthesis.

• TRUE 😀

• FALSE 😭

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Bacteria in root nodules change nitrogen gas into what form?

• carbon dioxide

• oxygen

• ammonia

• H2O

An organism that uses the sun’s energy or chemical

energy to make nutrients

• autotroph

• heterotroph

• carnivore

• worm

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NGSS.MS-LS1-6

An organism that feeds on other organisms for

nutrients and energy

• autotroph

• heterotroph

• a cactus

• bacteria

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NGSS.MS-LS2-3

animal that feeds only on plants

• carnivore

• herbivore

• omnivore

• decomposer

_{How is nitrogen returned to the atmosphere?}

• through transpiration

• cellular respiration

• Bacteria change nitrates in the soil into nitrogen gas.

• Photosynthesis

The source of energy for all living things is the sun. Sunlight is used by ______________

• consumers / heterotrophs

• bacteria

• decomposers

• producers / autotrophs

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NGSS.MS-LS1-6

NGSS.MS-LS2-3