Photosynthesis Review

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Photosynthesis Review
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Light Dependent Reactions
View an animation of the light dependent
reaction http//www.biology4all.com/resources_lib
rary/source/61a.swf

• Answer the following questions
• What happens when Photosystem II absorbs
  sunlight?
• Where do the electrons from Photosystem II go?
• From where does Photosystem II regain its
  electrons?
• To whom does Photosystem I give its electrons?
• Where do the newly formed ATP and NADH go?
• http//www.lucilledesign.com/BerkeleyHS/lab12.htm

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• 1.What happens when Photosystem II absorbs
  sunlight?
• 2 electrons become excited and leave photosystem
  II.
•  
• 2.Where do the electrons from Photosystem II go?
• To an electron acceptor.
•  
• 3.From where does Photosystem II regain its
  electrons?
• Water splits to yield an e-
•  
• 4.To whom does Photosystem I give its electrons?
• An electron acceptor then onto NADP
•  
• 5.Where do the newly formed ATP and NADH go?
• Enter the light independent reaction (Calvin
  cycle)
•  

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Calvin Cycle
Click on the illustration to view an animation of
the Calvin Cycle
http//www.bio.umass.edu/biology/conn.river/calvin
.html
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1. Name the orange colored plant pigment.What
color does it reflect?What color does it
absorb?
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1. Name the orange colored plant pigment.What
color does it reflect?What color does it
absorb?The orange colored plant pigment is
carotene.Carotene reflects orange-colored
light.Carotene absorbs or uses all other colors
oflight but orange.
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2. Name the bright green-colored plant
pigment.What color does it reflect?What color
does it absorb?
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2. Name the bright green-colored plant
pigment.What color does it reflect?What color
does it absorb?The bright green-colored plant
pigment ischlorophyll a. Chlorophyll a reflects
greenlight. Chlorophyll a absorbs and is
energized by all colors of light but green.
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3. Name the blue-green colored plant
pigment.What color does it reflect?What color
does it absorb?
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3. Name the blue-green colored plant
pigment.What color does it reflect?What color
does it absorb?The blue-green colored plant
pigment is chlorophyll b.Chlorophyll b reflects
blue-green light.Chlorophyll b absorbs and is
energized by all colors of light but blue-green.
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4. Name the yellow colored plant pigment.What
color does it reflect?What color does it absorb?
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4. Name the yellow colored plant pigment.What
color does it reflect?What color does it
absorb?The yellow colored plant pigment is
xanthophyll.Xanthophyll reflects yellow
light.Xanthophyll absorbs and is energized by
all colors of light except yellow light.
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5. State the complete, balanced equation for
photosynthesis.
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5. State the complete, balanced equation for
photosynthesis.The complete, balanced equation
for photosynthesis is.........
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6. State the 2 reactants or raw materials needed
for photosynthesis.
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6. State the 2 reactants or raw materials needed
for photosynthesis.The 2 reactants or raw
materials needed for photosynthesis are carbon
dioxide and water.
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7. State the 2 products made by photosynthesis.
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7. State the 2 products made by
photosynthesis.The 2 products made by
photosynthesis are sugar (glucose) and oxygen.
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8. State the 2 main colors of light that plants
use for photosynthesis.
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8. State the 2 main colors of light that plants
use for photosynthesis.The 2 main colors of
light that plants use for photosynthesis are the
blue and red wavelengths of light.
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9. In what organelle in the plant cell does
photosynthesis occur?
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9. In what organelle in the plant cell does
photosynthesis occur?The organelle in the
plant cell where photosynthesis occurs is the
chloroplast.
http//web.jjay.cuny.edu/acarpi/NSC/13-cells.htm
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10. What organelle found in many plants is shown
in the whole diagram below?
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10. What organelle found in many plants is shown
in the whole diagram below?The organelle shown
below is the chloroplast, seen in a cut-away side
view.
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11. What structure found in the chloroplast is
shown by B in the diagram below?
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11. What structures found in the chloroplast are
shown by B in the diagram below?
The structures found in the chloroplast that is
shown by B in the diagram below are the
thylakoids.
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12. What structure found in the chloroplast is
shown by A in the diagram below?
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12. What structure found in the chloroplast is
shown by A in the diagram below?
The structure found in the chloroplast that is
shown by A in the diagram below is the grana. The
grana consists of stacks of thylakoids (B).
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13. What structure found in the chloroplast is
shown by C in the diagram below?
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13. What structure found in the chloroplast is
shown by C in the diagram below?
The structure found in the chloroplast that is
shown by C in the diagram below is the stroma.
The stroma is the fluid filled space b
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14. Why are structures A B in the chloroplast
green?
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14. Why are structures A B in the chloroplast
green?
Structures A B in the chloroplast are green
because their membranes are covered with the
green chlorophyll molecules.
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15. Which structures in the chloroplast, the
thylakoids and the grana, or the stroma, requires
the presence of light for their reactions to
occur?
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15. Which structures in the chloroplast, the
thylakoids and the grana, or the stroma, requires
the presence of light for their reactions to
occur?Since their membranes contain
chlorophyll, the thylakoids and the grana require
the presence of light for their reactions to
occur. Hence, their reactions are known as the
light (dependent) reactions.
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16. Which structures in the chloroplast, the
thylakoids and the grana, or the stroma, does not
require the direct presence of light for its
reactions to occur?
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16. Which structures in the chloroplast, the
thylakoids and the grana, or the stroma, does not
require the direct presence of light for its
reactions to occur?The stroma (Calvin cycle)
does not require the direct presence of light for
its reactions to occur. Hence, its reactions are
known as the light-independent reactions (they
still need light reactions, ATP and NADPH
products to proceed).
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17. What molecule carries energy from the light
reactions in the grana to the stroma where the
energy is then stored in sugar molecules?
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17. What molecule carries energy from the light
reactions in the grana to the stroma where the
energy is then stored in sugar molecules?ATP
carries energy from the light reactions in the
grana to the stroma where the energy is then
stored in sugar molecules.
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18. What molecule carries energy, electrons and
hydrogen from the light reactions in the grana to
the stroma where the energy and hydrogens are
used to make sugar molecules?
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18. What molecule carries energy, electrons and
hydrogen from the light reactions in the grana to
the stroma where the energy and hydrogens are
used to make sugar molecules?NADPH carries
energy, electrons and hydrogen from the light
reactions in the grana to the stroma where the
energy and hydrogens are used to make sugar
molecules.
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19. How are the thylakoids different from the
grana?
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19. How are the thylakoids different from the
grana?Grana consist of stacks of many
thylakoids on top of each other. Many thylakoids
stackedtogether make up one grana.
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20. How do the accessory pigments carotene,
xanthophyll, and chlorophyll b help
photosynthesis?
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20. How do the accessory pigments carotene,
xanthophyll, and chlorophyll b help
photosynthesis?The accessory pigments carotene,
xanthophyll, and chlorophyll b help
photosynthesis by capturing energy in the form of
light colors that chlorophyll a cannot capture.
This ultimately makes photosynthesis more
efficient!
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Literature Cited
http//ghs.gresham.k12.or.us/science/ps/sci/ibbio/
cellenergy/photorev/basics/rev.htm http//www.scie
nce.smith.edu/departments/Biology/Bio231/calvin.ht
ml http//www.biology4all.com/resources_library/so
urce/61a.swf http//www.freeclipartpictures.com/0f
rames/flowers.html http//office.microsoft.com/cli
part/default.aspx?lcen-uscag1 http//web.jjay.c
uny.edu/acarpi/NSC/13-cells.htm http//www.bio.um
ass.edu/biology/conn.river/calvin.html http//www.
lucilledesign.com/BerkeleyHS/lab12.htm