Campbell Biology: Concepts and Connections, 8e (Reece et al.)
Chapter 7 Photosynthesis: Using Light to Make Food
7.1 Multiple-Choice Questions
1) What is the name given to organisms that can make their own food and thus sustain
themselves without consuming organic molecules derived from other organisms?
A) chemotrophs
B) heterotrophs
C) synthesizers
D) autotrophs
2) Photoautotrophs
A) make sugar by using organic raw materials.
B) produce organic molecules from inorganic molecules.
C) eat other organisms that use light energy to make food molecules.
D) include only the green plants.
3) Which of the following is an example of a photoautotroph?
A) algae in freshwater and marine ecosystems
B) grizzly bears in Alaska
C) bacteria in our mouth
D) mushrooms growing on the side of a dead tree
4) Autotrophs that utilize light as their energy source are
A) chemosynthetic autotrophs.
B) photoautotrophs.
C) fungi.
D) heterotrophs.
5) What is the likely origin of chloroplasts?
A) mitochondria that had a mutation for photosynthesis
B) photosynthetic prokaryotes that lived inside eukaryotic cells
C) prokaryotes with photosynthetic mitochondria
D) eukaryotes that engulfed photosynthetic fungi
6) In most green plants, chloroplasts are
A) concentrated in a zone of leaf tissue called the mesophyll.
B) concentrated in a portion of the leaf called the stroma.
C) evenly distributed throughout the leaf tissue.
D) evenly distributed throughout the entire plant.
7) ________ cells in leaves are specialized for photosynthesis.
A) Companion
B) Mesophyll
C) Sclerenchyma
D) Tracheid
8) CO2 enters and O2 escapes from a leaf via
A) stomata.
B) thylakoids.
C) grana.
D) stroma.
9) In the chloroplast, sugars are made in a compartment that is filled with a thick fluid called the
A) stomata.
B) thylakoid.
C) matrix.
D) stroma.
10) Thylakoids are arranged in stacks called
A) cristae.
B) stomata.
C) grana.
D) vacuoles.
11) Where is chlorophyll found in a plant cell?
A) stroma
B) thylakoid membranes
C) cytoplasm
D) cristae
12) The oxygen released into the air as a product of photosynthesis comes from
A) water.
B) glucose.
C) carbon dioxide.
D) chlorophyll.
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13) Which of the following molecules is a reactant of photosynthesis?
A) CO2
B) glucose
C) O2
D) chlorophyll
14) If you expose a photosynthesizing plant to water that contains both radioactive H and
radioactive O, in which of the products of photosynthesis will the radioactive H and O show up?
A) H and O both in glucose
B) H in glucose; O in water
C) H in water; O in glucose
D) H in glucose and water; O in O2
15) A redox reaction involves the transfer of
A) oxygen.
B) water.
C) an electron.
D) carbon dioxide.
16) Which of the following statements concerning the role of redox reactions in photosynthesis
and cellular respiration is true?
A) Photosynthesis involves only reductions, whereas respiration involves only oxidations.
B) Photosynthesis involves only oxidations, whereas respiration involves only reductions.
C) In photosynthesis, carbon dioxide is oxidized to form sugar, whereas in respiration, sugar is
reduced to form carbon dioxide.
D) In photosynthesis, carbon dioxide is reduced to form sugar, whereas in respiration, sugar is
oxidized to form carbon dioxide.
17) What is the source of energy that provides the boost for electrons during photosynthesis?
A) light
B) NADPH
C) cellular respiration
D) ATP
18) Which of the following statements comparing photosynthesis and cellular respiration is
false?
A) ATP is not produced during photosynthesis; it is produced only during cellular respiration.
B) Photosynthesis is ultimately powered by light energy and respiration by the chemical energy
of fuel molecules.
C) Photosynthesis consumes CO2; respiration consumes O2.
D) Photosynthesis produces O2; respiration produces CO2.
19) The light reactions occur in the ________, while the Calvin cycle occurs in the ________.
A) stroma; thylakoid membranes
B) stroma; nucleus
C) cytoplasm; thylakoid membrane
D) thylakoid membranes; stroma
20) Which of the following are produced during the light reactions of photosynthesis?
A) glucose, ADP, NADP+
B) glucose, ADP, NADP+, CO2
C) ADP, NADP+, O2
D) ATP, NADPH, O2
21) Which of the following is part of the light reaction?
A) carbon fixation
B) reduction of carbon
C) regeneration of NADP+
D) formation of waste products in the form of O2
22) Which of the following are produced during the Calvin cycle?
A) glucose, ADP, NADP+
B) glucose, ADP, NADP+, CO2
C) ATP, NADPH, O2
D) ATP, NADPH, CO2
23) Carbon fixation
A) occurs when carbon atoms from CO2 are incorporated into an organic molecule.
B) supplies the cell with ATP.
C) occurs during the light reactions.
D) provides the cell with a supply of NADPH molecules.
24) Sunlight is a type of ________ energy.
A) electromagnetic
B) chemical
C) mechanical
D) sound
25) The full range of electromagnetic energy is called the ________ spectrum.
A) visible
B) electromagnetic
C) energy
D) ultraviolet
26) Why are most plants green?
A) Chlorophyll a reflects green light.
B) Chlorophyll a absorbs green light.
C) Chlorophyll b primarily uses green light as the source of energy for photosynthesis.
D) Green helps plants blend into their environment as a sort of camouflage.
27) Which of the following colors contributes the least energy to photosynthesis?
A) blue
B) red
C) orange
D) green
28) Which of the following wavelengths of light would you expect to be reflected or transmitted
by chlorophyll a?
A) blue
B) green
C) yellow
D) red
29) Chlorophyll b
A) is best at absorbing the energy of green light.
B) is best at absorbing the energy of blue-violet and red light, just like chlorophyll a.
C) passes absorbed energy to chlorophyll a.
D) catalyzes the incorporation of carbon atoms into RuBP.
30) Plant cells are protected from the harmful effects of excessive light energy and reactive
oxidative molecules by
A) mitochondria.
B) chlorophyll.
C) carotenoids.
D) ATP.
31) A packet of light energy is called a
A) quantum.
B) pigment.
C) photon.
D) phaser.
32) Which of the following statements about the absorption of photons by pigment molecules is
true?
A) It takes several minutes for the pigment electrons to become excited.
B) Photons raise electrons in pigments to the ground state.
C) Excitation of the electrons is a very stable state.
D) Energy can be released by the excited electron as heat, light, or fluorescence.
33) Which of the following photosynthetic pigments can be found at the photosystem reaction
center?
A) chlorophyll b
B) chlorophyll a
C) a carotenoid
D) phycocyanin
34) Which of the following is a normal process of photosynthesis that could not occur if all
reaction centers were inactivated by a toxin?
A) donation of excited electrons by chlorophyll a to a primary electron acceptor
B) donation of excited electrons by chlorophyll b to a primary electron acceptor
C) absorption of photons by chlorophyll b
D) absorption of photons by carotenoids
35) Which of the following molecules is a product of photosynthesis?
A) CO2 and chlorophyll
B) glucose and O2
C) O2 and CO2
D) glucose and CO2
36) Clusters of light-gathering pigments in a photosystem
A) pass energy to the reaction center.
B) are found in the roots of plants.
C) absorb electrons.
D) break down H2O.
37) In a photosystem, clusters of chlorophyll a, chlorophyll b, and carotenoid pigments function
most like
A) an antenna.
B) a propeller on a motorboat.
C) a windmill.
D) a spring.
38) The energy that excites the photosystems is supplied by
A) electrons passing down the electron transport chain.
B) ATP.
C) photons.
D) NADPH.
39) The electron transport chains of the light reactions
A) are located in the stroma.
B) shuttle electrons from photosystem II to photosystem I.
C) provide energy for the citric acid cycle.
D) are found on the plasma membrane of mesophyll cells.
40) As a result of the cascade of electrons down the electron transport chains of the light
reactions,
A) NADPH is reduced to NADP+.
B) NADPH is oxidized to NADP+.
C) NADP+ is reduced to NADPH.
D) NADP+ is oxidized to NADPH.
41) The electrons lost from the reaction center of photosystem I are replaced by electrons from
A) CO2.
B) H2O.
C) ATP.
D) photosystem II.
42) The electrons lost from the reaction center of photosystem II are replaced by electrons from
A) CO2.
B) ATP.
C) H2O.
D) photosystem I.
43) Photosystem II
A) receives electrons from photosystem I.
B) passes electrons to photosystem I.
C) does not have a reaction center.
D) releases CO2 as a by-product.
44) Photophosphorylation during photosynthesis differs from oxidative phosphorylation during
cellular respiration in that
A) it involves an electron transport chain.
B) energy is stored in the form of a proton (H+) concentration difference.
C) generation of ATP is driven by a flow of protons (H+) through ATP synthase.
D) the final electron acceptor is NADP+ and not oxygen.
45) In photophosphorylation, energy from electron flow is used to transport ________ from the
________ to the thylakoid compartment, generating a concentration gradient of ________.
A) electrons; grana; H+
B) H+; grana; electrons
C) H+; stroma; H+
D) H+; stroma; ATP
46) In chloroplasts, ATP synthase
A) catalyzes the Calvin cycle.
B) phosphorylates ADP to ATP.
C) is found in the stroma.
D) helps produce the concentration gradient of H+.
47) In photosynthesis, the chemiosmotic production of ATP
A) requires oxygen.
B) is similar to the production of ATP in mitochondria.
C) is done by the Calvin cycle.
D) is a result of the oxidation of glucose.
48) Mitochondria transfer ________ energy from ________ to ATP; chloroplasts transform
________ energy into the chemical energy of ATP.
A) chemical; food; light
B) food; light; chemical
C) light; food; kinetic
D) food; light; nuclear