Transcript Plants for food - Mrs. Simmons' Biology

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 [email protected]
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
• Haven’t signed up for remind101? text
@ec0d6a4 to phone number (469) 518-2634
KEY CONCEPT:
Matter cycles in and out of an
ecosystem.
https://www.youtube.com/watch
?v=xFE9o-c_pKg
• Watch this youtube video on the carbon
cycle.
The Carbon and Nitrogen
Cycles
What is Carbon?
• Carbon is an
element that is
in all living
things.
• Molecules
containing
carbon are
called Organic.
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.
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.
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.
• CFC’s deplete the ozone layer
Remainder of class time
• Finish carbon cycle webquest
• Finished with carbon? Complete your
homework.
• Write Nitrogen cycle on the top of right
side of booklet
• Glue in picture directly underneath
• Write what is in red
The Nitrogen Cycle
• Living organisms need nitrogen to make
proteins
• The air is 79% nitrogen which is inert
(most living things can’t use N2 in gas
form)
• Nitrogen fixing changes N2 into a useable
form to be taken in by plant’s roots
• This happens by lightning, nitrogen – fixing
bacteria and artificial fertilizers
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.
AIR
N2
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
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?