2.8 biogeochemicals cycles

Question 1

1-Photosynthesis
2-Respiration
3-Decomposition
4-Methanogenesis
5-Methanotrophy
6-Fossil Fuel Formation
7-Combustion
 what cycles is this?

Answer 1

the carbon cycle

Question 2

atmospheric CO2 is fixed in organic molecules

Answer 2

Photosynthesis

Question 3

organic molecules are oxidized and CO2 is released into the atmosphere

Answer 3

Respiration

Question 4

: organic matter in the wastes and remains of organisms is oxidized and CO2 is released

Answer 4

Decomposition

Question 5

Production of methane (CH4) as organic carbon is catabolized

Answer 5

Methanogenesis

Question 6

Catabolism of CH4 into other forms (allowing greater carbon cycling)
Can occur aerobically or anaerobically

Answer 6

Methanotrophy

Question 7

organic matter over time and extreme conditions are transformed into petroleum, coal, and natural gas

Answer 7

Fossil fuel formation

Question 8

burning of wood, oil, gas, coal, and other organic producing CO2

Answer 8

Combustion

Question 9

Conversion of N2 into NH3 (NH4+)

Carried out by aerobic/anaerobic bacteria and archaea (free living and symbiotic)

Answer 9

Nitrogen Fixation:

Question 10

Conversion of NH4+ into nitrite (NO2–) or nitrate (NO3–)
Nitrosomonas oxidizes ammonia and forms nitrite
Nitrobacter oxidizes nitrite and forms nitrate

Answer 10

Nitrification:

Question 11

Nitrates are utilized by plants and a number of microbes to produce biomass (proteins etc.)

Answer 11

Assimilation

Question 12

Certain microbial species use nitrate/nitrite as a terminal electron acceptor during anaerobic respiration and produce N2

Answer 12

Denitrification:

Question 13

Organic nitrogen (proteins etc.) in plant and animal wastes or remains are broken down by bacteria and fungi with ammonium being released

Answer 13

Ammonification

Question 14

Use of microbes to transform toxic molecules to nontoxic products

Answer 14

Bioremediation