Photosynthesis and Respiration MCQs : This section focuses on the "Photosynthesis and Respiration". These Multiple Choice Questions (MCQs) should be practiced to improve the Photosynthesis and Respiration skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
What is the maximum absorption wavelength for photosystem I in green plants?
A. 550 nm
B. 600 nm
C. 700 nm
D. 750 nm
Question 2
The breakdown of glucose occurs by the process known as
A. glycolysis
B. fermentation
C. anaerobic respiration
D. Krebs cycle
Question 3
Which one of the following is a product of both cyclic and noncyclic photophosphorylation?
A. NADPH
B. O2
C. ATP
D. Carbohydrate
Question 4
NADP+ is reduced to NADPH during
A. light dependent reactions
B. photorespiration
C. calvin cylcle
D. none of these
Question 5
As a result of the photosynthetic process, which product is formed?
A. Oxygen
B. Water
C. Carbon dioxide
D. Both (a) and (b)
Question 6
In noncyclic photophosphorylation, the ultimate acceptor of electrons that have been produced from the splitting of water is
A. NADP+
B. chlorophyll a
C. carbon dioxide
D. chlorophyll b
Question 7
Rubisco (RuBP Carboxylase-oxygenase enzyme), glyceraldehyde 3-phosphate, and NADPH all play a role in
A. the dark reactions of photosynthesis
B. the breakdown of glucose into CO2
C. cellular respiration when O2 is present
D. alcohol fermentation
Question 8
Where does the O2 come from that is essential for the proper functioning of oxidative phosphorylation?
A. Fermentation
B. Light reactions of photosynthesis
C. Dark reactions of photosynthesis
D. Carbon fixation
Question 9
In oxygenic photosynthesis, water is split in order to provide the
A. electrons needed to reduce P680
B. O2 needed for the dark reactions
C. electrons needed to reduce NADH
D. electrons needed for cyclic photophosphorylation
Question 10
In cells having organelles, the steps of the Krebs cycle and the electron transport system occur in the
A. cell membrane
B. mitochondria
C. endoplasmic reticulum
D. none of these
Question 11
The manufacture of ATP in both photosynthesis and respiration is made possible by
A. the existence of a proton gradient across specific membranes
B. the action of ATP synthase
C. energy from the movement of electrons
D. All of the above
Question 12
Carbon fixation requires the expenditure of ATP molecules which is generated by
A. formation of glucose during the Calvin cycle
B. replenishment of chlorophyll
C. ETS (electron transfer system) during the light reactions
D. none of the above
Question 13
Where do the protons come from that make up the proton gradient used in the light reactions of photosynthesis?
A. Glucose
B. ATP
C. H2O
D. NADPH
Question 14
A eukaryotic cell that can carry out only fermentation instead of the complete aerobic respiration of glucose
A. produces less CO2
B. is lacking in O2
C. has mitochondria present
D. all of these
Question 15
If the oxygen is labeled in CO2 and provide this CO2 to a plant, where it is expected to find this labeled oxygen after the plant had undergone photosynthesis?
A. In the water used
B. In the NADPH
C. In the carbohydrate produced
D. In the oxygen given off by the plant
Question 16
Oxidative phosphorylation is to respiration as __________ is to photosynthesis
A. carbon fixation
B. electron transport chain
C. light capture by chlorophyll
D. reduction of NADPH
Question 17
Electron transport systems play a vital role in
A. Calvin cycle
B. photorespiration
C. light-dependent reactions
D. all of these
Question 18
In algae, photosynthesis takes place in
A. choloroplasts
B. cell membrane
C. mitochondria
D. none of the above
Question 19
Hydrogen (electron) acceptor in the light reactions is
A. ADP
B. NADP+
C. NAD+
D. FADH
Question 20
In oxygenic photosynthesis, the electron donor is
A. water
B. oxygen
C. NADH
D. NADPH
Question 21
Which of the following is the reduced form of a temporary electron carrier molecule?
A. FADH2
B. ATP
C. NADP+
D. CO2
Question 22
The followings are the products of the light reactions of photosynthesis except
A. ATP
B. oxygen
C. NADPH
D. glucose
Question 23
The electrons that are released by the splitting of water during photosynthesis ultimately end up in
A. ATP
B. O2
C. NADPH
D. rubisco
Question 24
What process in cellular respiration is essentially the reverse of carbon fixation in photosynthesis?
A. Glycolysis
B. Citric acid cycle
C. Oxidative phosphorylation
D. Alcohol fermentation
Question 25
The rate of photorespiration in most plants increases at.higher temperatures. Some plants have evolved a somewhat round-about system to deal with this problem. This series of reactions is called
A. ETS (electron transfer system in light reactions
B. C4 pathway
C. Photosystem II
D. Calvin cycle
Question 26
Antenna complexes, electron transport chains, and carbon fixation are all found in
A. animal cells
B. bacterial cells
C. plant cells
D. association with the reactions of the citric acid cycle
Question 27
Which of the following statements about energy metabolism is false?
A. The energy that powers living systems ultimately comes from the sun
B. All animals in some way rely on plants for their energy
C. Plants provide the water and CO2 that animals need to carry out respiration
D. All eukaryotic organisms carry out respiration in the presence of O2
Question 28
The cytochrome c oxidase complex
A. accepts electrons from cyt c
B. donates four electrons to O2
C. pumps protons out of the matrix space
D. all of these
Question 29
Assume the combined processes of photosynthesis and cellular respiration, the electrons that start as part of H2O at the beginning of the light reactions end up attaching to
A. O2 to make new H2O
B. NADPH to make new glucose
C. pyruvate to make ethanol
D. electron transport carriers to make O2
Question 30
During the light-dependent reactions of photosynthesis, which of the following does not occur?
A. Splitting of water
B. Carbon dioxide fixation
C. Release of oxygen
D. Absorption of light energy by photosystems
Question 31
In the Calvin cycle, carbon dioxide is fixed in a reaction with the
A. ribulose diphosphate
B. ribulose phosphate
C. ribose tri phosphate
D. 3-phosphoglyceric acid
Question 32
Which enzyme is involved in carbon-fixation reaction?
A. NADP reductase
B. Cytochrome reductase
C. Ribulose bisphosphate carboxylase
D. Glycerol kinase
Question 33
A cyclic electron transport process is the characteristic of
A. photosynthesis
B. methane oxidation
C. sulfide oxidation
D. methane production
Question 34
Which of the following serves as a reactant in photosynthesis and a product in cellular respiration?
A. O2
B. CO2
C. Sunlight
D. ATP
Question 35
The vast majority of the molecules that act as energy carriers to power cellular activities are made in
A. the nucleus
B. the Golgi apparatus
C. the cytosol
D. the mitochondria and chloroplasts
Question 36
Carbon dioxide is reduced in
A. noncyclic photophosphorylation
B. the Calvin cycle
C. the light reactions
D. both light and dark reactions
Question 37
More ATP is manufactured during __________ than at any other time in all of cellular metabolism.
A. fermentation
B. glycolysis
C. the light reactions of photosynthesis
D. oxidative phosphorylation
Question 38
What do NAD+, NADP+, and FAD+ all have in common?
A. They are reduced
B. They have a full complement of electrons
C. They are oxidized
D. They are what is used during carbon fixation in photosynthesis
Question 39
What do coenzyme A, CO2, oxaloacetate, and FADH2 all have in common?
A. They are all components or products of the citric acid cycle
B. They are part of the dark reactions of photosynthesis
C. They are part of the reactions of lactic acid fermentation
D. They are all elements of oxidative phosphorylation
Question 40
Which of the following structures or processes are logically associated with chloroplasts?
A. Plant cells
B. Chlorophyll
C. Thylakoid membranes
D. All of these
Question 41
In the initial step of photosynthesis, sunlight energizes the electron pair of
A. adenosine triphosphate (ATP)
B. chlorophyll pigments
C. water
D. carbon dioxide
Question 42
The end products of noncyclic photophosphorylation are
A. O2, ATP and NADPH
B. carbon dioxide, PGAL (phosphoglyceraldehyde), and H2
C. water, ADP and NADP+
D. carbon dioxide, ATP and water