Cell EnergyPhotosynthesis
What do you know about photosynthesis?
Answer the true/false questions using your prior knowledge about photosynthesis.
____ 1. Photosynthesisis important because it uses excess oxygen in the atmosphere.
____ 2. Photosynthesis creates energy.
____ 3. Photosynthesis stores energy in the bonds of glucose.
____ 4. Water is a necessary ingredient for photosynthesis.
____ 5. Carbon dioxide is produced by photosynthesis.
____ 6. The gasoline used to drive to school today is ultimately the result of photosynthesis.
____ 7. Chlorophyll, contained in the mitochondria, traps light energy for photosynthesis.
Photosynthetic organisms are producers.
Producers (autotroph) make their own source of chemical energy.
Plants use photosynthesis and are producers.
Photosynthesis captures energy from sunlight to make sugars.
Photosynthesis…the process through which plants
convert light energy to chemical energy in order to produce food
The energy involved in photosynthesis is stored in the chemical bonds of carbohydrates.
Photosynthesis Equation
H2O + CO2 C6H1206 + O2(water) + (carbon dioxide) (glucose) + (oxygen)
A balanced equation…
6H2O + 6CO2C6H12O6 + 6O2
ChloroplastLocated inside leaf cellsCapsule-shaped organelleContained by two membranes
Photosynthesis in plants occurs in chloroplasts.
Photosynthesis takes place in two parts of chloroplasts.– grana
(thylakoids)– stroma
chloroplast
stroma
grana (thylakoids)
Chloroplast PartsThylakoids: disk-shaped vesicles
stacked inside the chloroplastGranum: a stack of thylakoidsStroma: liquid material inside the
chloroplastChlorophyll: pigment located inside the
thylakoid; gives plants their green color
Photosynthesis
2 parts of photosynthesis – light dependent and light independent
Light dependent uses sunlight to make ATP
Light independent uses that ATP to make Glucose (CALVIN CYCLE)
The light-dependent reactions capture energy from sunlight.
– take place in thylakoids– water and sunlight are needed– chlorophyll absorbs energy– energy is transferred along
thylakoid membrane then to light-independent reactions
– oxygen is released
Light Dependent
The light-independent reactions make sugars.
– take place in stroma– needs carbon dioxide
from atmosphere– use energy to build a
sugar in a cycle of chemical reactions
Light Independent
The equation for the overall process is:6CO2 + 6H2O C6H12O6 + 6O2
C6H12O6
granum (stack of thylakoids)
thylakoid
sunlight
1 six-carbon sugar
6H2O
6CO2
6O2
chloroplast1
2
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energy
stroma (fluid outside the thylakoids)
Photosynthesis (the basics)
http://www.youtube.com/watch?v=-5F2NcYqWr4
http://www.youtube.com/watch?v=mpPwmvtDjWw
Light Dependent
http://www.youtube.com/watch?v=HrMka8vj73U
http://www.youtube.com/watch?v=eY1ReqiYwYs
Calvin Cycle
http://www.youtube.com/watch?v=E_XQR800AgM