Photosynthesis
Plant cells and some Algae contain an organelle called the chloroplast. The chloroplast allows plants to harvest
energy from sunlight to carry on a process known as Photosynthesis. Specialized pigments in the chloroplast (including
the common green pigment chlorophyll) absorb sunlight and use this energy to combine carbon dioxide and water and
make GLUCOSE and OXYGEN. The complete the chemical reaction for Photosynthesis is:
6 CO2 + 6 H2O + energy (from sunlight)
RAW MATERIALS
ENERGY
C6H12O6 + 6 O2
PRODUCTS
In this way, plant cells manufacture glucose and other carbohydrates that they can store for later use.
Photosynthetic cells found mainly in the leaves may have thousands of chloroplasts.
QUESTIONS:
1. What type of cells contains chloroplasts? plants, specifically mesophyll cells
2. What is the energy autotrophs use to make their own food?
sunlight
photosynthesis
3. The food making process is called ___________________.
4. What are the raw materials for photosynthesis?
water (H2O) and carbon dioxide (CO2)
5. What simple sugar is produced? glucose
CO2
O2
6. What gas is USED? ________________
RELEASED? ________
7. Where are most photosynthetic cells in plants found? in the leaves in mesophyll cells
8. About how many chloroplasts can be found in photosynthetic cells? 1,000's
Chloroplasts are double membrane organelles with a smooth outer membrane and an inner membrane folded into
disc-shaped sacs called thylakoids. Thylakoids, containing chlorophyll and other accessory pigments (red, orange,
yellow, brown), are in stacks called granum (grana, plural). Grana are
FIGURE 1-CHLOROPLAST
connected to each other and they are surrounded by a gel-like material
called stroma. The INDIVIDUAL SACS formed by the inner membrane are
stacks
thylakoids
called _________________
and are arranged in ___________
like
pancakes.
9. What pigment is found inside a thylakoid? What color will it be? chlorophyll, reflect & appear green
ccessory pigments
10. Other pigments that trap sunlight are called A_____________
pigments. What colors are these pigments? red, orange, yellow, & brown
rana
11. STACKS of thylakoids are called G___________
(plural) or GRANUM (singular).
stroma
12. Stacks or grana are suspended in the _____________.
Light-capturing pigments in the grana are organized into photosystems.
1
C
Photosynthesis
Crossword Review
4
/
P
H
O
T
O
S
Y
N
T
H
O R G A N I
E
S
L I G H T
L
H
Legend:
S
I
O X Y G E N
/ = a space between 2 words
G
L
H
A T P
K
W A T E
S T R O M A
/
I
G
D
D
& B L U E
R E
U
P
U
C H E M
B
O
N
I
S
P H O T O N S
D
E
E
C
&
N
P H O T O R E S P I R A T I O N
O
T
2
C
O
2
&
W
A
T
E
R
I
O S M O S
I
S
Across
2. The compounds that result from the Calvin Cycle, such as glucose are THIS
4. The light-dependent reactions REQUIRE THIS
7. The light-dependent reactions release THIS waste which humans NEED
8. The light-dependent reactions produce THIS energy molecule
9. Atmospheric oxygen occurs as a result of photosynthesis by the breakdown of THIS during the beginning of the lightdependent reaction
10. Inside chloroplasts, the fluid-like matrix in which the Calvin cycle occurs is called THIS
12. Chlorophyll is important to many plants because these pigments absorb THESE COLORS
13. During photosynthesis, ATP molecules are generated by THIS PART of Stage 2
14. Light energy reaches cholorophyll in tiny packets called THIS
15. Is an inefficiency of photosynthesis in hot, dry conditions in which O2 cannot be released and CO2 cannot enter the
leaves to provide carbon to make glucose
Down
1. is an adaptation to photorespiration where the calvin cycle occurs in deeper plant cells
3. THESE are SUBSTRATES for photosynthesis (light AND dark reactions – Overall equation)
5. The light reactions take place in the membrane of THIS
6. After the phosphate bonds are broken in ATP in the Calvin cycle, the ADP is recycled back to THIS
11. THESE are the main PRODUCTS of photosynthesis are (think of overall equation)
12. THIS is located in the Stroma as a part of the Calvin Cycle