Science Standard 6d:
Biogeochemical Cycles/ Nutrient Cycles Ch. 3 Sec. 3
Biogeochemical Cycles, or Nutrient cycles, is how elements, chemical compounds, and other forms of matter
are passed from __________________________________________________________________________.
Types of Biogeochemical Cycles:
_______________Cycle
_______________- ex water cycle
_______________- ex carbon cycle and nitrogen cycle
_______________– ex phosphorus cycle
The Water Cycle
All living things require _______________ to survive.
Water cycles between the________________, atmosphere, land,
and______________________.
Several different processes are involved in the water cycle, including
___________ and transpiration.
During evaporation,____________________________________________________.
Transpiration is the________________________________________________________________.
During the day, the sun heats the____________________________.
Water changes from a ___________ to a ______________through the process of condensation.
Water vapor in the atmosphere condenses into tiny droplets that form_______________.
When the droplets______________________________, they __________________________ as
precipitation—rain, snow, sleet, or hail.
On land, much of the precipitation runs along the ____________________ of the ground until it enters a river
or stream that carries the runoff back to an ocean or lake.
Rain also seeps into the___________, some of it deeply enough to become________________________.
Water in the soil enters plants through the________________ , and the water cycle begins again.
The Carbon Cycle
Carbon is a key ingredient of_______________.
In the_________, carbon is present as carbon dioxide gas,
CO2.
Carbon dioxide is released into the atmosphere by
_______________
_______________
human activities
the decomposition of _____________________
Plants take in carbon dioxide and use the carbon to build
carbohydrates during_________________________.
The carbohydrates are passed along food webs to animals and
other consumers.
In the____________________, carbon is also found, along
with calcium and oxygen, in calcium carbonate, which is
formed by many marine organisms.
_______________Cycle
The Phosphorous Cycle
Phosphorus is necessary for _____________________________________________________________.
There is very little phosphorus in the ______________________ atmosphere, and most _______________is
stored in rocks and ocean sediments.
This phosphorus is slowly released into ________________ and ____________ and then used by organisms.
Phosphorus is a key part of________________________________________.
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The Nitrogen Cycle
Organisms need nitrogen to
build______________________.
Different forms of nitrogen cycle through the biosphere.
Nitrogen ________ is the most abundant form of nitrogen
on Earth.
It cannot be ________________used by organisms.
Nitrogen must be converted into compounds that can enter
food webs by the process of “Nitrogen Fixation”
Nitrogen Fixation
_______________Cycle
How do we get the Nitrogen we need? ____________________
Specialized ______________ convert N2 from the atmosphere to ammonia (NH3) for the plants to use.
Plants will use to the ammonia to make nitrogen-containing organic molecules
Animals get nitrogen by ___________________________________________________________________.
Denitrification
How is Nitrogen returned to the soil? _____________________________
When organisms die, decomposers return________________________. Other ________________ change
nitrogen compounds called nitrates back into nitrogen gas.
This process is called _______________________.
1. Define Biogeochemical Cycles:_____________________________________________________________
_______________________________________________________________________________________.
2. List the three types of Biogeochemical cycles: 1.______________, 2._______________, 3.______________
3. What do all living things require in order to survive?_________________
4. Where does water cycle? ___________________________________________________________________
5. During evaporation, what does water turn in to?__________________
6. What is transpiration?_____________________________________________________________________
7. What is condensation?_____________________________________________________________________
8. List 4 types of precipitation: 1._____________, 2._____________, 3._____________, 4._______________
9. What is seepage?_________________________________________________________________________
10. What is runoff?_________________________________________________________________________
11. What element is the key ingredient of living tissue?_____________
12. In the atmosphere, how is carbon present?______________
13. Why do plants need Carbon Dioxide?_____________________________________________________
14. Why is phosphorus necessary?___________________________________________________________
15. Where is most phosphorus stored?_________________________________________________________
16. Which two nucleic acids is phosphorus essential for?_________________________________
17. Why do organisms need nitrogen?__________________________________________________________
18. Which form of nitrogen is the most abundant form on Earth?_______________________
19. Can nitrogen be used directly by organisms?__________
20. What is Nitrogen Fixation?________________________________________________________________
21. Which organism carries out the process of Nitrogen Fixation?_________________________
22. What do the bacteria convert from the atmosphere to make ammonia for plants to use?_________
23. How do animals get nitrogen?______________________________________________________________
24. When organisms die, what return nitrogen to the soil?________________________
25. What is denitrification?___________________________________________________________________
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