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Photosynthesis Review
What is
Photosynthesis?
• Is a process by which green plants
and other organisms synthesize
their own food using carbon
dioxide,water and light.
What are Autotrophs?
• Are organisms that are capable of synthesizing
its own food from inorganic
substances(carbon dioxide, iron, sulfur) using
light.
• Some examples are:
1. Green plants
2. Algae
3. certain bacteria
Types of Autotrophs
Photoautotroph
Autotrophs such as
plants, bacteria and
algae that depend on
photosynthesis for
both energy and
carbon compounds.
Chemoautotroph
Bacteria that obtain its
carbon from
photosynthesis and
obtains its energy from
inorganic substances
such as iron, sulfur or
other minerals.
Chemical Reaction
6CO2 +
6H2O
Carbon
Dioxide
Water
light
>
C6H12O6 +
Glucose
(sugar)
6O2
Oxygen
Chlorophyll
Chlorophyll a light absorbing pigment that gives
plants their green color and converts the
energy of sunlight to food in the process known
as photosynthesis.
Photosynthesis consists of 2 parts: Light
reaction and Calvin Cycle
• A. True
• B. False
Photosynthesis
• The Light
Reaction
• The
Calvin
Cycle
Calvin Cycle
The Calvin Cycle gets ATP and NADPH from the
Light Reaction.
• A. True
• B. False
The real product of the Calvin Cycle is PGAL.
• A. True
• B. False
All autotrophs get energy to power cell activities
from
a. other organisms.
b.nonliving sources.
c. photoheterotrophs.
d.Xrays.
We rely on photosynthesis for:
a. running our automobiles.
b.heating our homes.
c. food.
d.all of the above.
The light reactions of photosynthesis end in
a. CO2.
b.H2O.
c. PSI and PSII.
d.NADPH.
The compounds ATP and NADPH
a. are not particularly stable.
b.contain too much carbon.
c. are produced by the Calvin cycle.
d.attract electrons.
Chemoautotrophs obtain energy from
a. fungi and bacteria.
b.oxidizing inorganic substances.
c. carbon dioxide.
d.sunlight.
During photosynthesis, the oxygen atoms in
water molecules
a. help form carbohydrates.
b.help form both carbohydrates and water.
c. end up as oxygen gas.
d.act as hydrogen-acceptor molecules.
Sugar phosphates are produced in the Calvin
cycle. These compounds are used by the plant
to make
a. lipids.
b.amino acids.
c. proteins.
d.all of the above.
Radiant energy is absorbed by chlorophyll.
a. occurs during the light reactions
b.occurs during the Calvin cycle
c. occurs during both phases
d.does not occur during either phase
Photosynthesis converts ____ into ____.
a. sugar, chemical energy and water
b.hydrolyzed carbohydrates, usable energy
c. sulfur compounds, carbohydrates
d.visible light, chemical energy
Chlorophyll absorbs light in _____ range(s) of
wavelengths.
a. the violet/blue and orange/red
b.all visible
c. the black/white and orange/yellow
d.primarily the green
Where does the Calvin Cycle occur in the
chloroplast?
a. thylakoid membrane
b.stroma
c. grana
d.granum
________________ carries water and dissolved
minerals from the roots to the leaves.
a. Pipes
b.Xylem
c. Phloem
d.Cord
__________________ carries the food made in
the leaves to the rest of the plant.
a. Pipes
b.Xylem
c. Phloem
d.Cord
What does RuBP stand for?
a. Phosphoslyeric acid
b.Ribulose bisphosphate
c. Ribo biphosphate
d.Ribose bipalladium
In the Light Reaction Chlorophyll traps light and
splits _______________.
a. water
b.carbon dioxide
c. glucose
d.PGAL
What is the function of ATP in photosynthesis?
a. transports H ions
b.compound used to store energy
c. compound used to store fats
d.transports NADPH
What is the function of the stomates in leaves?
a. protection
b.shape
c. light absorption
d.diffusion of gases