A correct path that nitrogen could take would be

air -> bacteria -> plants -> animals

air -> animals -> plants -> bacteria

animals -> air -> bacteria -> plants

bacteria -> air -> plants -> animals

In the nitrogen cycle, what does label A in the diagram represent?

Carbon dioxide in the atmosphere

Which statement is true about the carbon dioxide-oxygen cycle?

animals breathe in oxygen and release carbon dioxide which is used by plants

animals breathe in nitrogen and release oxygen which is used by plants

animals breathe in nitrogen and release carbon dioxide which is used by plants

animals breathe in carbon dioxide and release oxygen which is used by plants

The CO2/O cycle is important to animals because it provides

a gas they take in when breathing

In the CO2/O cycle arrows in a diagram represents __________.

The cycling of CO2 and O through the environment.

The cycling of water through the environment.

The cycling of nitrogen through the environment.

The cycling of energy through nonliving parts of the environment.

Which best explains why runoff is important?

It returns water to other locations on Earth

It increases the chance of flooding

It makes evaporation occur faster

Eutrophication is caused by

excess nutrients building up in the water.

industrial point-source pollution.

unlined landfills and septic tanks.

wastewater from homes mixing with drinking water.

In eutrophication, dissolved oxygen levels decrease because

bacteria use it as they decompose organic material

algae uses it during photosynthesis

it reacts with hydrogen to form H2O (water)

fish use it up as they consume algae

A new golf course is built next to a river. Over the past several months, the nitrate levels of the water in the river have been increasing. Which best explains the cause of the increasing nitrate levels?

chemical reactions with pesticides and fertilizers

Why is nitrogen important to organisms?

All plants and animals need nitrogen to make amino acids, proteins and DNA.

All plants and animals need nitrogen to make fatty acids and carbohydrates.

All plants and animals need nitrogen to make sugar.

Biologists describe nutrients as moving through cycles because the substances

are passed between organisms and the environment and then back to organisms.

start as simple organic forms that plants need.

provide “building blocks” and energy that organisms need.

are needed by organisms to carry out life processes.

Material Cycles Review

Authored by MICHAEL KELLY

Biology

8th Grade

NGSS covered

Used 52+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What converts nitrogen gas into a usable form for plants and animals?

bacteria

rain

fungi

car exhaust

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Organisms that need nitrogen to survive.

only plants

only animals

only bacteria

all living things

How do animals get the nitrogen they need?

From the air they breathe

From the water they drink

From the food they eat

From the sun

Gas that makes up 78% of our atmosphere.

Oxygen

Nitrogen

Hydrogen

Carbon Dioxide

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

nitrogen composition

nitrogen fixation

ammonia

denitrification

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula for atmospheric nitrogen?

N₂

NH₃

NO₃

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

Assimilation

Fixation

Ammonification

Denitrification

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Material Cycles Review

What converts nitrogen gas into a usable form for plants and animals?

Organisms that need nitrogen to survive.

How do animals get the nitrogen they need?

Gas that makes up 78% of our atmosphere.

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

What is the formula for atmospheric nitrogen?

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

According to this diagram, plants use nitrogen to make _________________________

According to this diagram, animals get proteins from eating ________________________

The process that allows organisms to use nitrogen

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