Agenda%20for%20Today

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Agenda for Today

• Mission Countdown 4 minutes to answer
• Nitrogen cycle self-directed notes- 20 min
• Class discussion 5 min
• Nitrogen cycle quiz 10 min
• Google pearson nitrogen cycle quiz and click on
  post quiz (1st or 2nd link)
• Email results to simmonsjenniferm_at_gmail.com

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Homework

• Mrssimmonsbio.weebly.com
• Homework? Ecology ? watch symbiosis video ? write
  6 sentence summary
• No internet? Research symbiosis in text book and
  write a 6 sentence summary
• Due Monday
• Havent signed up for remind101? text _at_ec0d6a4
  to phone number [phone]

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KEY CONCEPT Matter cycles in and out of an
ecosystem.
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https//www.youtube.com/watch?vxFE9o-c_pKg

• Watch this youtube video on the carbon cycle.

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The Carbon and Nitrogen Cycles
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What is Carbon?

• Carbon is an element that is in all living
  things.
• Molecules containing carbon are called Organic.

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The Carbon Cycle

• Plants take in CO2 because they need carbon and
  oxygen to use in photosynthesis.

• When animals eat plants they use some of
• the carbon containing compounds to grow

• Some carbon-containing compounds are
• used to release energy by respiration.

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Carbon Cycle

• Keep in mind all living things have carbon in
  them, so when they die, decomposers help return
  that carbon to the environment and soil.

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(No Transcript)
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Disruptions in carbon cycle

• Carbon in the environment is used to make coal,
  oil, and natural gas (fossil fuels).
• Humans burn Fossil fuels in a process called
  Combustion releases too much CO2 back into the
  air.
• Burning of Fossil fuels causes global warming.
• CFCs deplete the ozone layer

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Remainder of class time

• Finish carbon cycle webquest
• Finished with carbon? Complete your homework.

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• Write Nitrogen cycle on the top of right side of
  booklet
• Glue in picture directly underneath
• Write what is in red

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The Nitrogen Cycle

• Living organisms need nitrogen to make proteins
• The air is 79 nitrogen which is inert (most
  living things cant use N2 in gas form)
• Nitrogen fixing changes N2 into a useable form to
  be taken in by plants roots
• This happens by lightning, nitrogen fixing
  bacteria and artificial fertilizers

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Nitrogen Cycle

• Animals eat the plants and therefore take in
  nitrogen.
• When animals and plants die, decomposers help
  return the nitrogen to the soil.
• Other bacteria then change the nitrogen in the
  soil back into a gas to be released back into the
  air.

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AIR N2
AIR N2
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Disruption in nitrogen cycle

• Humans use fertilizers with added nitrogen on
  their crops
• causes nitrate to leach into groundwater
• Can deplete oxygen in water and reduce animal
  populations

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On the back answer these questions

• 1. Where does carbon come from in an ecosystem?
• 2. How have humans intruded on the carbon cycle?
• 3. Why is nitrogen important in the environment?
• 4. What is nitrogen fixation?
• 5. How have humans intruded on the nitrogen cycle?