Biology Ec7 Quiz Nitrogen Cycle

Legume plants have the ability to fix atmospheric nitrogen. How do they do this?

• they have a mutualistic symbiotic relationship with bacteria

• fungus on the roots of legumes are able perform nitrogen fixation

• two types of plastids within their leaves perform a series of reactions that fix nirogen

• assimilation of bacteria found in the soil

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What percentage of the Earth's atmosphere is made of nitrogen?

• 17%

• 38%

• 58%

• 78%

Even though nitrogen gas makes up most of Earth's atmosphere, plants cannot use this nitrogen gas to make organic compounds for themselves and other organisms. Why?

• The two nitrogen atoms in a molecule of nitrogen gas are held together by a very stable triple bond.

• Almost all nitrogen in gaseous form is found only in the highest portions of the atmosphere.

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Special nitrogen-fixing bacteria can also transform nitrogen gas into useful forms. Where are they found?

• on the leaves of plants from the pea family

• on the roots of plants from the pea family

• on the leaves of plants from the grass family

• on the roots of plants from the grass family

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Ammonification is the process in which nitrogen gas gets turned into______

• atmospheric nitrogen (N₂)

• ammonium (NH₄⁺)

• nitrite (NO₂^-)

• nitrate (NO₃^-)

Ammonium in the soil can be turned into nitrate by a _______ -step process completed by ______ different types of bacteria.

• 2, 2

• 3,3

• 1,2

• 1,3

In the form of nitrate, nitrogen can be used by plants through the process of ________________.

• sublimation

• fixation

• denitrification

• assimilation

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The process of converting ammonium ions to nitrites or nitrates is called nitrification.

• true

• false

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The process of assimilation is the opposite of nitrogen fixation

• true

• false

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Ammonium is released to the environment by decaying organisms or decaying wastes. These wastes release nitrogen in the form of nitrite and nitrates.

• true

• false

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