Nitrogen and Phosphorous cycles

why do organisms need nitrogen?

• Humans need nitrogen

• To manufacture proteins

• To store electricity

• Nitrogen is present in organic and inorganic forms

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NGSS.MS-LS2-1

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Nitrogen is present in _______ and inorganic forms.

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inorganic nitrogen is a gas (N2) found in the A_________

Select all correct answers:

organic nitrogen can be found in...

• Living organisms

• Dead organisms

• waste products

• atmosphere

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NGSS.MS-LS2-3

Briefly explain one way bacteria is important in the nitrogen cycle.

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Approximately how much nitrogen makes up the atmosphere?

• 98%

• 78%

• 58%

• 85%

True or False:

Nitrogen-fixing bacteria are the only organisms that can take up atmospheric nitrogen

• True

• False

Nitrogen fixing bacteria convert nitrogen gas into a_____a (a form that plants can use)

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NGSS.MS-LS2-1

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True or False:

Lightning can cause nitrogen fixation

• True

• False

in terms of Assimilation,

Plants absorb nitrates, nitrites and a______m.

Tags

NGSS.MS-LS2-1