Nitrogen Cycle Question Preview (ID: 60745)


Denitirification, Assimilation, Nitrogen Fixation, Nitrification. TEACHERS: click here for quick copy question ID numbers.

There is nitrogen on an organism's waste and dead organisms. _________ break them down during denitrification.
a) autotrophs
b) decomposers
c) animals
d) abiotic factors

Which are key organisms in the nitrogen cycle?
a) sun
b) heterotrophs
c) producers
d) bacteria

When fossil fuels are burned, excess nitrogen is in the atmosphere. This causes
a) smog
b) global warming
c) climate change
d) more intense hurricanes

Organisms cannot use nitrogen when it is in the
a) water
b) soil
c) atmosphere
d) plants

What is the cause of eutrophication?
a) burning fossil fuels
b) fertilizers running off into nearby bodies of water
c) acid rain
d) global warming

Our atmosphere is mostly made up of
a) oxygen
b) nitrogen
c) carbon dioxide
d) water vapor

Plants absorb usable nitrogen from the soil through the process of
a) assimilation
b) burning fossil fuels
c) nitrification
d) deforestation

Nitrogen is needed to make which important macromolecules?
a) proteins and lipids
b) all macromolecules
c) carbohydrates, proteins, and nucleic acids
d) nucleic acids and proteins

Which process removes nitrogen from the atmosphere?
a) denitrification
b) nitrogen fixation
c) cellular respiration
d) combustion

How do animals get the carbon and nitrogen they need?
a) breathing
b) eating
c) from the ground
d) from decomposition

This process occurs when bacteria convert ammonia in the soil into nitrates which plants can absorb.
a) nitrogen fixation
b) photosynthesis
c) nitrification
d) assimilation

What occurs during denitrification?
a) Plants absorb nitrogen gas from the atmosphere.
b) Decomposers convert nitrogen to a usable form.
c) Animals eat nitrogen.
d) Bacteria return nitrogen to gas form.

Bacteria in the root nodules of legumes like peas and beans ______ the process of nitrogen fixation
a) control
b) damage
c) prevent
d) help

What has to happen to nitrogen before it can be used
a) Bacteria must convert it
b) Plants must absorb it
c) Decomposers must break it down
d) Animals must eat it

How do humans affect the nitrogen cycle?
a) polluting the land, water, and air
b) burning fossil fuels and using fertilizers
c) introducing invasive species
d) deforestation and combustion

What is the first thing that happens when too much nitrogen finds its way to a body of water like a pond or lake?
a) oxygen levels in the water drop
b) organisms die
c) algae grow too much
d) plants can't do photosynthesis

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