WorksheetsPHOTOSYNTHESIS
Total questions: 20
Worksheet time: 15mins
The products of the light reactions of photosynthesis that are utilized in the Calvin cycle are:
O2 & ATP
ATP and NADPH
Glucose and O2
CO2 & H2O
Where does the Calvin cycle take place?
thylakoid membrane
chlorophyll molecule
cytoplasm surrounding the chloroplast
stroma of the chloroplast
In any ecosystem, terrestrial or aquatic, what group is always necessary?
autotrophs
green plants
photosynthesizers
decomposers.
Oxygen is released as a result of photosynthesis. Oxygen is a by-product of which of the following?
chemiosmosis
splitting the water molecules
the electron transfer system of photosystem I
the electron transfer system of photosystem II
A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?
blue and violet
red and yellow
blue, green, and red
green, blue, and yellow
In the thylakoid membranes, the main role of the antenna pigment molecules is to...
synthesize ATP from ADP and Pi
transfer electrons to the primary electron acceptor.
split water and release oxygen to the reaction-center chlorophyll
absorb photons and transfer light energy to the reaction-center chlorophyll
The reaction-center chlorophyll of photosystem I is known as P700 because
it absorbs 700 photons per microsecond.
it reflects light with a wavelength of 700 nm.
there are 700 chlorophyll molecules in the center.
it best at absorbing light with a wavelength of 700 nm.
Which of the events listed below occur in the light reactions of photosynthesis?
only NADP is produced.
NADPH is reduced to NADP+.
O2 is the last electron acceptor.
light is absorbed and transferred to reaction-center chlorophyll a.
Which statement describes the functioning of photosystem II?
The splitting of water yields CO2 as a by-product.
The electron vacancies in P680 are filled by electrons derived from water.
The splitting of water yields H+ ions that releases into the stroma.
The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP+.
In a plant cell, where are the ATP synthase complexes located?
thylakoid membrane
plasma membrane
inner mitochondrial membrane
thylakoid membrane & cristae
In chloroplasts, chemiosmosis involves the proton pumps to pump protons from
the matrix to the stroma.
the stroma to the thylakoid space.
matrix into the intermembrane space.
the intermembrane space to the thylakoid space.
Where are the molecules of the electron transport chain found in plant cells?
stroma of chloroplasts
outer membrane of chloroplast.
inner membrane of chloroplasts
thylakoid membranes of chloroplasts
Synthesis of ATP by the chemiosmotic mechanism occurs during
respiration only.
photosynthesis only.
both photosynthesis and respiration.
both photosynthesis and photorespiration
What is the relationship between wavelength of light and the quantity of energy per photon?
They are inversely related.
They are separate phenomena.
They have a direct, linear relationship.
They are only related in certain parts of the spectrum.
Carotenoids are often found in foods that are considered to have antioxidant properties in human nutrition. What related function do they have in plants?
They reflect orange light.
They serve as accessory pigments.
They dissipate excessive light energy.
They take up toxins from the water.
Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and
NADP+ to the light reactions.
The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle
provides water and electrons to the light reactions.
The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the
light reactions with sugars to produce ATP.
The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides
the light reactions with water to split.
What is the primary function of the Calvin cycle?
transport RuBP out of the chloroplast
synthesize simple sugars from carbon dioxide
use ATP and NADPH to release carbon dioxide
synthesize simple sugars from carbon dioxide and water
In the process of carbon fixation, RuBP attaches a CO2 to produce a 6 carbon molecule, which is then split in two. After phosphorylation and reduction, what more needs to happen in the Calvin cycle?
a gain of NADPH.
regeneration of RuBP.
regeneration of rubisco.
all the G3P produced will leave the cycle.
Why are C4 plants able to photosynthesize with no apparent photorespiration?
They conserve water more efficiently.
They do not participate in the Calvin cycle.
They use PEP carboxylase to initially fix CO2.
They will close their stomata during hot dry days.
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they..
produce sugar during the night.
fix CO2 into sugars in the bundle-sheath cells.
fix CO2 into organic acids during the night in the mesophyll cell.
fix CO2 into organic acids during the night in the bundle-sheath cells.
