1. 1. What is not true of chlorophyll and other accessory pigments in plants?
A) Plant pigments absorb solar energy.
B) Chlorophyll provides electrons that will be used to produce ATP.
C) Chlorophyll provides the enzymes needed to produce carbohydrates.
D) Chlorophyll absorbs light of specific wavelengths.
E) Chlorophyll is packed in thylakoid membranes.
2. If the Calvin cycle uses three molecules of CO2 to produce six molecules of G3P
(glyceraldehydes-3-phosphate), but only one G3P molecule is used to form a carbohydrate molecule,
what happens to the other carbons that were taken in?
A) Any unused CO2 is released into the environment.
B) The other five G3P molecules are used to regenerate more RuBP.
C) Any unused G3P molecule is converted and stored as starch.
D) The remaining five G3P molecules are used to reduce CO2.
3. What are the products of photosynthesis?
A) water and carbon dioxide B) water and oxygen
C) oxygen and carbohydrate D) carbohydrate and water
4. What organisms are capable of photosynthesis?
A) plants only B) plants and algae only
C) plants and some bacteria only D) plants, algae, and some bacteria
5. The action spectrum of photosynthesis shows a high light absorption for violet/blue and
orange/red and a low absorption for green/yellow. If we were to set up an experiment where narrow
bands of unicolored light were shown on an aquatic plant such as Elodea, and we counted the number
of bubbles of oxygen produced as an indicator of photosynthetic rate, how would the graph appear?
A) just like the action spectrum with peaks at violet/blue and orange/red and a trough at
yellow/green
B) exactly inverted from the action spectrum with a peak for yellow/green
C) perfectly flat because many wavelengths are used by chlorophyll
D) a descending line because ultra-violet has more energy than infra-red
6.When an electron has been excited to a higher energy state, it can then drop back to the original
level, re-emitting the light as fluorescence. When chlorophyll is extracted in solution, and a
bright red or blue light is shown on it, the chlorophyll fluoresces brightly. However, when the
chlorophyll is packaged inside chloroplasts and the red or blue light is turned on, there is no
fluorescence. This most likely indicates that
A) the red and blue light waves are reflected by the chlorophyll membrane.
B) chlorophyll in solution is a different molecule than chlorophyll in a chloroplast.
C) excited electrons are transferred to electron acceptors in the chloroplast.
D) fluorescence does not work in living cells.
7.Which of these is NOT a major photosynthetic pigment in plants?
A) chlorophyll a B) chlorophyll b C)chlorophyll c D)carotenoid pigments

2. 8. Why are plants green?
A) They absorb only green wavelengths of light.
B) They absorb only yellow and blue wavelengths of light.
C) They reflect nearly all wavelengths of light. D) They reflect green wavelengths of light.
9.Although it is not possible to be exact about when cyanobacteria first appeared on earth, most
scientists agree that about two billion years ago, they expanded rapidly and raised the oxygen in
the earth's atmosphere to present levels in about 500 million years. This appearance of oxygen
and the beginning of aerobic life was made possible by the appearance of
A) fermentation. B)Photosystem I.
C) Photosystem II. D)ATP hydrolysis.
10.Which statement is NOT true about photosystems?
A) Photosystem I passes electrons on to Photosystem II.
B) Each photosystem contains numerous pigment molecules that act as antennas to capture
light.
C) Photosystem II contains a reaction center molecule that loses electrons which are then
replaced by electrons from water.
D) Electrons in the reaction center molecule are excited by absorbed solar energy and are
passed along to an acceptor molecule.
11.Which statement is NOT true about the cyclic electron pathway?
A) It produces ATP. B) It involves Photosystem I.
C) It produces NADPH.
D) Electrons lost from Photosystem I eventually return to Photosystem I.
12. Which statement is NOT true about the noncyclic electron pathway?
A) Electrons are boosted to higher energy level in Photosystem I.
B) Sunlight excites electrons in Photosystem II.
C) It produces ATP.
D) It produces carbohydrates through carbon dioxide fixation.
13. Which is NOT true about photosynthesis?
A) In noncyclic photophosphorylation, water is split and oxygen is released.
B) Photosystem II makes noncyclic photophosphorylation more efficient than does cyclic
photophosphorylation.
C) The cyclic system is used when there is insufficient NADP+ present to absorb electrons in
plant cells.
D) More carbohydrate is produced during cyclic photophosphorylation than during noncyclic
photophosphorylation.
14. Which is most closely associated with the Calvin cycle?
A) ATP production B) oxygen production
C) carbon dioxide fixation D) carbon dioxide production
15. C4 plants
A) store carbon dioxide temporarily as oxaloacetate. B) are found in hot dry climates.
C) have a net photosynthetic rate two to three times that of C3 plants.
D) All of these are correct