Biogeochemical Cycle Carbon and Nitrogen

How does carbon in a grass plant get into a lion?

• The lion eats the grass
• Carbon from grass doesn't end up in a lion. 
• The carbon ends up in the food the lion eats. 
• The lion breathes in carbon given out by the plant

Tags

NGSS.MS-LS2-3

How nitrogen is "fixed" into useable form for plants...

• through action of bacteria only
• through lightning only
• through action of bacteria & lightning
• through photosynthesis

Tags

NGSS.MS-LS2-3

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

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

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

NGSS.MS-LS1-5

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

• bacteria
• plants
• animals
• producers

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

What is happening at 1?

• respiration: releasing CO₂
• decomposing CO₂ in the soil
• photosynthesis: absorbing CO₂
• turning CO₂ from the atmosphere into organic molecules

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

Where is a lot of the CO₂ located on earth?

• space
• absorbed in the ground
• in the atmosphere acting as a greenhouse gas 
• in plants

Greenhouse gases....

• make plants green
• increase the temperature of the earth
• produce oxygen
• decrease the temperature of the earth

Tags

NGSS.MS-ESS3-5

Which of the following add carbon dioxide to the atmosphere?

• volcanoes
• combustion of fossil fuels
• animal and plant respiration
• all of these

Tags

NGSS.MS-ESS3-4