ch. 18.2 cycles of matter
TRANSCRIPT
3/25/14
Bell work:
How do we (all animals) get nitrogen in the nitrogen cycle?
Announcements:
• Ch. 18.1 & 18.2 Quiz – Thurs., 3/27
• Extra Credit due Thurs., 3/27
• Fieldtrips: 3/26 Selby, 4/17 Myakka, 4/30 Mote
Objectives:
Students will explore the water cycle, carbon cycle, nitrogen cycle, and oxygen cycle.
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Ch. 18.2 Cycles of Matter
Water Cycle
What is the driving force (energy source) for the water cycle?
a. b. c. d.
0 000
a. The ocean
b. Winds
c. Humans
d. The sun
45
What process releases water from the leaves of plants?
Evapora
tion
Tra
nspira
tion
Condensa
tion
Pre
cipita
tion
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45
a. Evaporation
b. Transpiration
c. Condensation
d. Precipitation
• Just as water moves continuously through ecosystems, other types of matter do too.
• Cycles are everywhere in nature – materials needed by organisms are constantly recycled
• Law of Conservation of Mass: matter cannot be created nor destroyed, it only changes form (chemical reactions, physical changes, etc.)
4 types of matter that are cycle through ecosystems:
WaterCarbonNitrogenOxygen
Manure & Compost are used as fertilizers to increase plant growth
Nitrogen cycle
• We can’t use the Nitrogen (N2) that we breathe – it has to be changed through nitrogen fixation
Which process converts atmospheric nitrogen to a form organisms can use?
Nitr
ogen Abso
r...
Nitr
ogen Fixa
t...
Nitr
ogen Rete
n...
Nitr
ogen Stabi..
.
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a. Nitrogen Absorption
b. Nitrogen Fixation
c. Nitrogen Retention
d. Nitrogen Stabilization
How are nitrogen compounds in organisms returned to the soil?
Deco
mposit
ion ..
.
Exhala
tion (
b...
Cellu
lar re
spi..
.
Nitr
ogen fixa
t...
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a. Decomposition (breaking down of dead tissue)
b. Exhalation (breathing out)
c. Cellular respiration
d. Nitrogen fixation
The main reason for adding manure to a garden is to increase…
Carb
on
Nitr
ogen
Oxyg
en
Wate
r
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a. Carbon
b. Nitrogen
c. Oxygen
d. Water
Why do organisms need Nitrogen?
To re
leas
e ene...
An e
ssentia
l p...
Importa
nt life
...
To cr
eate ener..
.
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45
a. To release energy
b. An essential part of proteins & DNA
c. Important life processes such as growing and reproducing
d. To create energy rich sugars
Oxygen Cycle
Oxygen Cycle
• Algae (phytoplankton, protists) release more than 50% of O2 in Earth’s atmosphere
During which process is oxygen gas released into the atmosphere?
Chem
osynth
esis
Deco
mposit
ion
Photo
synth
esis
Tra
nspira
tion
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45
a. Chemosynthesis
b. Decomposition
c. Photosynthesis
d. Transpiration
What do animals release back into the atmosphere?
Oxyg
en
Nitr
ogen
Carb
on dio
xide
Arg
on
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45
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Argon
Carbon Cycle
During the carbon cycle, ____ take in carbon dioxide from the atmosphere.
Anim
als
Consu
mers
Deco
mpose
rs
Pla
nts
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45
a. Animals
b. Consumers
c. Decomposers
d. Plants