Nitrogen Cycle

What percentage of nitrogen is the air we breathe on Earth?

• 22%

• 36%

• 78%

• 64%

How does a farmer's fertilizer cause a dead zone in the ocean?

• What is used on land has no interaction with what happens in the ocean.

• The run off from the farm brings nitrogen to the ocean. This increases the population size of all organisms. The presence of so many organisms, like fish, in a single area causes sharks and other predators to come. When they consume all the organisms in the area, it becomes known as a dead zone.

• The run off from the farm brings nitrogen to the ocean. This causes the algae population to grow quickly. When they die the decomposers break them down and use up all the oxygen in the water. If there is no oxygen, nothing can live.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Water run off from a farm can result in cause algae in the ocean to grow out of control.

• TRUE

• FALSE

Tags

NGSS.MS-LS2-4

NGSS.MS-ESS3-4

 

Nitrogen from animal wastes or plant and animal tissue...

• Is lost from the system.

• Must be fixed near leguminous plants.

• Is fixed by bacteria and fungi in the soil.

• Is already fixed and can be used.

Tags

NGSS.MS-LS2-3

 

 

Nitrogen is not a key element in proteins.

• TRUE

• FALSE

Nitrogen fixing bacteria combine nitrogen with other elements so that producers can use it.

• TRUE

• FALSE

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Bacteria that convert atmospheric nitrogen into a form that plants can use are called nitrogen-fixing bacteria.

• TRUE

• FALSE

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-1

 

Modern fertilizers supply fixed nitrogen to the soil, eliminating the need for nitrogen-fixing bacteria.

• TRUE

• FALSE

Tags

NGSS.MS-LS2-3

Nitrogen is the least abundant of the major atmospheric gases.

• TRUE

• FALSE

Atmospheric nitrogen, in its gaseous form, is useful to plants.

• TRUE

• FALSE