1. Study for Molecular Biology & Biotech Test EOG Unit 3, ?’s 6-10
Warm Up on page 17
Write the equations for photosynthesis and respiration
Rewrite the equations using words
How do your cells use carbohydrates, fats and protein.
Date
Session
Activity
page
5/5, 8 7
Warm Up 17
Carbon Cycle 18
Nitrogen Cycle 19
Homework:
Study for Molecular Biology & Biotech Test
EOG Unit 3, ?’s 6-10

2. 8.L.3 Understand how organisms interact with and respond to the biotic and abiotic components of their environment Explain how the flow of energy within food webs is interconnected with the cycling of matter (including water, nitrogen, carbon dioxide, and oxygen)

3. Putting together what you already know
Energy is changed as it moves through a food web/chain.
Energy flows one way, no recycling
Matter is recycled as it moves through a food web.
The most common elements on earth are carbon, nitrogen, oxygen and hydrogen. These elements, along with water, cycle between biotic and abiotic elements of the environment. This cycling is done through familiar processes!

4. Recreate the carbon cycle with clay Use arrows and label the
Carbon Cycle Notes
Carbon Cycle Diagram
Recreate the carbon cycle with clay
Use arrows and label the
processes the arrows represent

5. Carbon Cycle Diagram Carbon Cycle Notes Photosynthesis (plants):
Move C from air to living organisms
Respiration (living things):
C moved into atmosphere & oceans
Diffusion:
atmosphere C oceans
Decomposition:
Decomposers move C to soil, atmosphere & oceans
Incomplete decay fossil fuel storage of C (coal/oil)
Combustion:
Burning fossil fuels or other organic material moves C into atmosphere
OCEANS:
CO2 used in sea shells, also ends up in sed. rock: limestone
Carbon Cycle Diagram

6. CO2 + H2O  C6H12O6 + O2 C6H12O6 + O2  CO2 + H2O
Photosynthesis moves C from the atmosphere & oceans into living organisms
CO2 + H2O  C6H12O6 + O2
Respiration moves C from the living organisms into the atmosphere & oceans
C6H12O6 + O2  CO2 + H2O

7. Decomposers move C to soil, atmosphere & oceans
Decomposition
Decomposers move C to soil, atmosphere & oceans
Incomplete Decomposition
fossil fuel storage of C (coal/oil)

8. Carbon-containing molecule + O2  CO2 + H2O + Heat
Combustion
Carbon-containing molecule + O2  CO2 + H2O + Heat
Burning fossil fuels or other organic material moves C into the atmosphere

9. Oceans contain earth’s LARGEST store of carbon
Carbon is also in the Oceans!!
Animals in the ocean also pull carbon from water (dissolved CO2) to use in their shells (CaCO3)
When they die, their shells are deposited at the bottom of the ocean. The shells become the sedimentary rock: limestone.
Oceans contain earth’s LARGEST store of carbon

11. Nitrogen Cycle diagram
Nitrogen Cycle Notes

12. Nitrogen Cycle p11 Nitrogen Cycle Notes Nitrogen fixation :
N2 in atmosphere is broken down and bonded with H or O (NH3/N2O)
Bacteria
Lightning
Industrial
Ammonification bacteria decompose plant and animal matter into (NH4)
Nitrification
Bacteria convert NH3  NO3
Denitrification = bacteria convert NO3  N2

13. Nitrogen cycle 4 processes
Nitrogen fixation : N2 in atmosphere are broken down and bonded with H or O (NH3/N2O)
Special Bacteria
Lightning
Industrial
Ammonification (Decay) = decomposing plant and animal matter into (NH4)
Nitrification = bacteria convert NH3 to NO3
Denitrification = bacteria convert NO3 into N2

14. Nitrogen Fixation
Special bacteria live in the soil or on root nodules of legumes
(peas, beans, clover). They convert N2 to NH3. Now these special plants are able to use the nitrogen. This is a symbiotic relationship!

15. Nitrification Different bacteria in soil can convert NH3 to NO3.
Other plants can now use this form of Nitrogen.

16. Nitrogen Fixation
Energy from lightning breaks nitrogen molecules apart, so they can combine with oxygen (N2O), then dissolve in rain to create (NO3), which is carried to the ground with the rain and deposited into the soil.
Plants then absorb the nitrates and use them.

17. Industrial Production
Nitrogen Fixation
Industrial Production
Chemical reactions are used to
change the bonding of N2
to NH3
(fertilizer)

18. Ammonification Decomposition plant and animal matter into (NH4)

19. Denitrification
A third type of bacteria converts nitrates (NO3) to atmospheric nitrogen (N2), which is returned to the air!

21. Human Impact carbon
Fossil Fuel naturally release carbon very slowly BURNING fossil fuels releases stored carbon very quickly. Burning anything (trees, oil, etc) releases CO2 into the atmosphere.
CO2 gas dissolves in rain drops, making them more acidic…acid rain affects plants & aquatic life
Increasing CO2 in the atmosphere increases global warming.
As more CO2 dissolves into oceans, they become more acidic (ocean acidification) Limestone and SHELLS dissolve in acidic solutions.

22. Human Impact….nitrogen
Human activities have doubled the amount of fixed nitrogen entering the nitrogen cycle in the past 100 years
Fertilizer runoff into surface water causes algae blooms…eutrophication (pond scum)
Fertilizer increases the rate of nitrification in the soil, increasing NOx to the air, which dissolves in rain drops and causes acid rain

23. Stop motion paper nitrogen cycle video https://www. youtube. com/watch

24. Study videos