Chapter 8
PHOTOTSYNTHESIS
Review
autotrophs
The first stage of photosynthesis, the light
harvestings steps are called……
The light dependent reactions
These reactions take place in the …...
Thylakoid membrane
The light reactions occur in two stages, the
first collection of proteins and pigments is
called….
Photosystem II
Within PSII, the reaction center contains a
series of pigments and a special molecule
of ____________________ which transfers
excited electrons to the primary electron
acceptor.
Chlorophyll a
Chlorophyll is green because it ________or
__________ green light.
Reflects or transmits
An absorption spectrum for chlorophyll
and the action spectrum for
photosynthesis are not exactly the same.
WHY?
Plants generally have more than one type
of pigment.
The energy of the energized electrons
from reaction center II are used to ….
Pump H+ from the stroma to the lumen.
These energy depleted electrons are used
to replace electrons lost in …….
reaction center I of PSI.
Energized electrons in PSI are passed to a
chlorophyll a, then to a primary electron
acceptor and then to an electron transport
chain. Eventually they are used to
___________NADP+ to form NADPH
reduce
Electrons lost by PSII are replaced by
electrons removed from _____________.
water
Complete the equation…
H2O  ½ O2 + ___e- + __H+
H2O  ½ O2 + _2_e- + _2_H+
H+ pumped to the lumen diffuses through
a _____________ to causes the formation
of __________ from ________.
ATP synthase
ATP
ADP + Pi
The products of the light reactions are
1.
2.
3.
1. NADPH
2. ATP
3 Oxygen
The second Part of Photosynthesis that
does not require light is called…
The “Light independent reactions”
The Dark Reactions
The Calvin Cycle
_______________is the enzyme that
combines Carbon dioxide with a five
carbon molcule called ribulose bisphosphate to form a 6 carbon molecule.
rubisco
Cyclic electron flow is used to generate
more _________ because the Calvin cycle
needs mor of this energy molecule .
ATP
Variations of photosynthesis occur in
plants that are sometimes in low carbon
dioxide environments where they fix CO2
temporarily in 4 carbon compounds, this
type of plant is called a _____ plant.
C4
A second variation of photosynthesis
occurs in plants that exist in dry
environments where somata are closed
during most of the day. These plants are
called ______________
CAM Plants
The products of the Calvin cycle are
NADP+, ADP + Pi, and 3 carbon
compounds.
The 3 carbon compounds that exit the
calvin cycle can be truned into ………..
Moleucles like glucose, polymers like
starch and cellulose or other materials
need by the cell.
The overall equation for photosynthesis
is….
6CO2 and 6H2O  C6H12O6 + 6O2
The reactions of the calvin cycle take place
specifically in this area of the chloroplast.
Stroma
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