biogeochemical cycles

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

How do plants get the nitrogen they need?

• from the air
• from the soil or water in which they live
• from the Sun
• from broken-down rocks

Tags

NGSS.MS-LS2-1

Organisms that break down dead plants & animals and release nitrogen back into atmosphere...

• bacteria
• plants
• animals
• producers

Tags

NGSS.MS-LS2-3

Photosynthesis

• absorbs CO2
• releases CO2

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Respiration

• absorbs CO2
• releases CO2

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

NGSS.HS-LS2-5

The flow of carbon from the biosphere to the atmosphere would be slowed by reducing the

• amount of fertilizer applied to fields.
• number of size of forest fires
• buildup of carbonate rocks
• amount of rain water used for irrigation

Tags

NGSS.HS-ESS2-6

NGSS.HS-LS2-5

Organisms use nitrogen to form

• carbohydrates and lipids
• proteins and lipids
• lipids and nucleic acids
• proteins and nucleic acids

Tags

NGSS.MS-LS1-7

Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert

• nitrates intro nitrogen gas
• ammonia into proteins
• nitrogen gas into ammonia
• proteins into nitrates

What is one of the most important processes that removes carbon from the atmosphere? 

• photosynthesis
• cellular respiration
• erosin
• soil respiration

Tags

NGSS.MS-LS1-6

What effect will an increase in ocean phytoplankton have on the carbon cycle?

• more carbon will leave the atmosphere
• more carbon will enter the atmosphere
• less carbon will leave the atmosphere
• less carbon will enter the atmosphere

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS1-6

NGSS.MS-LS2-3