SUNDAY, aUGUST12, 2012
PHOTOSYNTHESIS MCQ
1. Which among the following element is essential
for photolysis of water
(a) Nitrogen (b) Chlorine
(c) Carbon (d) Oxygen
(e) Magnesium
2. Plants are known as purifiers of air due to the
process of
(a) Respiration (b) Photosynthesis
(c) Transpiration (d) Dessication
(e) Guttation
3. The percentage of light absorbed by chlorophyll
from total absorption is
(a) 12% (b) 83% (c) 96%
(d) 4% (e) 5%
4. When the CO2 uptake cannot be increased by
increasing the light, it is referred to as:
(a) Extinction point
(b) CO2 saturation point
(c) Light saturation point
(d) Light compensation point
(e) None
5. Which among the following conditions are
favourable for cyclic photophosphorylation:
(a) Aerobic condition only
(b) Aerobic and low light intensity
(c) Aerobic and optimumk light
(d) Anaerobic and low light intensity
(e) Anaerobic and optimum light
6. When pigment system II is illuminated in presence
of ferricyanides and NADP, it can carry out
(a) Hill reaction
(b) Cyclic photophosphorylation
(c) Dark reaction
(d) All of these
(e) None of these
7. The synthesis of chlorophyll-a is traced back to
which component of Kreb’s cycle
(a) Oxaloacetic acid (b) Succinyl CoA
(c) Fumaric acid (d) Oxalosuccinic acid
(e) Succinic acid
8. Which among the following plant is used in the study
of photosynthesis?
(a) Chlorella (b) Asparagus
(c) Garden Pea (d) Acetabularia
(e) Hydrilla
9. If X is the rate of photosynthesis at shorter wave
length radiation, Y at higher wavelenth, Z is the rate
at the combination of shorter and higher wavelength,
then Emerson effect is
(a) X > Z + Y (b) Z = X + Y
(c) Z = X = Y (d) Z > X + Y
(e) Z < X + Y
10. During the dark reaction of photosynthesis
(a) Water is split
(b) CO2 is reduced to organic compounds
(c) Chlorophyll is activated
(d) 6 carbon sugar is broken into 3 carbon sugar
(e) None
11. The enzyme that fixes atmospheric CO2 in C4 plant
is
(a) PEP carboxylase (b) RUBISCO
(c) RUBP carboxylase (d) Hydrogenase
(e) Aldolase
12. The number of carbon atom in the acceptor
compound of carbondioxide in C3 plants is
(a) 2 (b) 3 (c) 4
(d) 5 (e) 6
13. In C4 plants carbondioxide reduction occur in
(a) Mesophyll stroma
(b) Guard cell stroma
(c) Bundle sheath stroma
(d) Palisade stroma
(e) Spongy stroma
14. The number of ATP and NADPH2 required to fix
one molecule of CO2 is respectively
(a) 3 and 2 (b) 2 and 3
(c) 5 and 3 (d) 3 and 5
(e) 5 and 2
15. The energy coming from electrons as radiations
when it come to the ground state from triplet stage
is called as:
(a) Incident light (b) Phosphorescence
(c) Fluorescence (d) Sunlight
(e) All of these
16. Formation of energy currency of cell during
photosynthesis is called as
(a) Substrate level phosphorylation
(b) Phosphorylation
(c) Photophosphorylation
(d) Oxidative phosphorylation
(e) None of these
17. The red drop phenomenon is due to the disruption
of the photochemical activity of
(a) Pigment system I
(b) Pigment system II
(c) Carotenoids
(d) PSI and PS II
(e) Any of these
18. In photosynthesis hydrogen is transferred from the
light reaction to the dark reaction by
(a) DPN (b) DNA
(c) ATP (d) NADP
(e) NAD
19. The first step in photosynthesis is the
(a) Formation of ATP
(b) Ionisation of water
(c) Excitement of an electron of chlorophyll by
light
(d) Joining of two 3-carbon compound to form
glucose
(e) Formation of NADH2
20. The electron gap formed in PS-I during non
cyclic phosphorylation is filled due to the supply of
electrons coming from
(a) Pigment system I
(b) Photolysis of water
(c) Pigment system II
(d) Oxidative phosphorylation
(e) Photophosphorylation
21. Who among the following stated for the first time that
electron donor in photosynthesis is water?
(a) Van Neil (b) Blakslee
(c) Melvin Calvin (d) Van Helmont
(e) J.D. Robertson
2 2. C4 pathway for CO2 fixation was first studied
(a) Emerson & Arnold (b) Krotkov et al
(c) Hatch & Slack (d) Blackman
(e) Melvin Calvin
23. Chlorophyll - a differs from chlorophyll-b in having a
(a) -CHO group (b) -COOH group
(c) -CH3 group (d) -NH2 group
(e) -CO group
24. Dark CO2 fixation is present in the following plant:
(a) Bryophyllum (b) Sugarcane
(c) Maize (d) Pea
(e) Rice
25. Starch and Cellulose are compounds consisting of
many units of
(a) Amino acids (b) Fatty acids
(c) Simple sugars (d) Glycerol
(e) Glycollic acid
26. Calvin cycle occurs in
(a) Cytoplasm (b) Peroxisome
(c) Chloroplast (d) Mitochondria
(e) Golgi body
27. In photosynthesis in chloroplast, dark reactions occur
in
(a) Grana lamellae (b) Stroma
(c) Thylakoids (d) Stroma lamellae
(e) Matrix
28. The number of oxygen molecules released per light
quanta during light reaction is
(a) Quantum yield
(b) Quantum requirement
(c) Quantasome
(d) Photosynthetic yield
(e) RQ
29. The colour of rose petal is due to water soluble
pigment present in the
(a) Cytoplasm (b) Intercellular space
(c) Nucleus (d) Vacuoles
(e) Golgi body
30. NADP is
(a) An enzyme (b) A part of s-RNA
(c) A co-enzyme (d) A part of t-RNA
(e) None
31. For the synthesis of organic matter the green plants
need only
(a) Chlorophyll (b) CO2 and H2O
(c) Light (d) All of these
(e) None of these
32. In CAM plants the initial carbondioxide acceptor is
(a) Phosphoglyceric acid
(b) Phosphoenol pyruvic acid
(c) Ribulose 1,5 biphosphate
(d) Oxaloacetic acid
(e) Malic acid
33. The inhibitory effect of oxygen on the rate of
photosynthesis is called as
(a) Warburg effect (b) Pasteur effect
(c) Richmond-Lang effect (d) Blackman effect
(e) Emerson effect
34. Which among the following sentence is wrong
about C4 plants
(a) Leaves posses Kranz anatomy
(b) RUBISCO is present in mesophyll cells
(c) PEPCO is present in mesophyll
(d) CO2 acceptor PEP
(e) None
35. Photosynthetically active radiation is represented
by the range of wavelenth of
(a) 640 - 650 nm (b) 600-960 nm
(c) 400-700 nm (d) 340-450
(e) 500-600 nm
36. Number of ATP and NADPH2 required for the
formation of one molecule of carbohydrate in C3
plant is:
(a) 3 and 2 (b) 30 and 18
(c) 18 and 12 (d) 12 and 18
(e) 18 and 30
37. During photorespiration reaction between oxygen
and substrate is happening within
(a) Mitochondria (b) Chloroplast
(c) Peroxisome (d) Nuclues
(e) Lysosome
38. In CAM plants, reduction of CO2 to carbohydrate
takes place within
(a) Mesophyll cell (b) Bundle sheath cells
(c) Epidermal cells (d) Xylem cell
(e) Phloem cells
39. Whioch among the following group of plants
contains agranal chloroplast?
(a) C3 plants (b) CAM plants
(c) C4 plants (d) Halophytes
(e) C2 plants
40. Where does the light reaction of photosynthesis
takes place?
(a) Quantasomes in thylakoid
(b) Outer membrane of chloroplast
(c) Inner membrane of chloroplast
(d) Stroma
(e) Matrix
41. Solar energy brings which of the following functions
at PS-II
(a) Photolysis of Water
(b) Reduction of CO2
(c) Reduction of O2
(d) Activation of chlorophyll molecule
(e) All of these
4 2. Which among the following is the distinguishing
feature of cyclic photophosphorylation
(a) Only pigment system II is involved
(b) Photolysis of water is taking place
(c) Both pigment system I and II are involved
(d) Phosphorylation only takes place
(e) Phosphorylation and photolysis take place
43. In the following photosynthesising organism
chlorophyll - a is absent
(a) Bacteria (b) Flowering plants
(c) Cryptogams (d) Ferns
(e) Algae
44. In angiosperms synthesis of chlorophyll occurs in
the presence of
(a) Phytochrome (b) Cytochrome
(c) Light (d) Oxygen
(e) All the above
45. Light energy is converted into chemical energy in
the presence of
(a) Pyrenoid (b) Chloroplast
(c) Ribosomes (d) Mesosomes
(e) Mitochondria
46. The concept of quantosome and photosynthetic unit
was given by
(a) Emerson (b) Warburg
(c) Arnold (d) Priestly
(e) None
47. Which among the following pigment is called as
accessory pigments?
(a) Carotene (b) Xanthophyll
(c) Phycobilins (d) All the above
(e) None of these
48. The pigment molecule which act as the reaction
centre is:
(a) Chlorophyll (b) Carotenoids
(c) Carotenes (d) Phycobilins
(e) Anthocyanin
49. Photosynthesis is
(a) Oxidative, anabolic, endergonic process
(b) Reductive, anabolic, exergonic process
(c) Reductive, ababolic, endergonic process
(d) Oxidative catabolic exergonic process
(e) None of these
50. The scientist who coined the terms phlogiston and
dephlogiston to denote the CO2 and O2 is
(a) Melvin Calvin (b) Joseph Priestly
(c) Stephan Hales (d) Julius Sach
(e) Robert Myer
51. Ribulose 1,5 biphosphate is found in
(a) Stroma of chloroplast
(b) Grana of chloroplast
(c) Matrix of mitochondria
(d) Cristae of mitochondria
(e) None of these
(a) Chlorophyll -a (b) Carotene
(c) Xanthophyll (d) Chlorophyll-b
(e) Phycobilins
53. The first stable product of dark reaction in C4 plants
(a) Phosphoglycolic acid
(b) Glycolic acid
(c) Oxaloacetic acid
(d) Phosphoglyceric acid
(e) Malic acid
54. The scientist who discovered that the site of
photosynthesis is chloroplast
(a) Arnon (b) Joseph Priestly
(c) Julius Sachs (d) Robert Mayer
(e) Senebier
55. The molecular formula of chlorophyll -b is
(a) C55H72O5N4Mg
(b) C55H70O6N4Mg
(c) C50H70O5N4Mg
(d) C50H72O6N4Mg
(e) C55H72O5N5Mg
56. If the intensity of light is gradually increased to
20 times, the rate of photosynthesis will
(a) Keep increasing proportionately
(b) Not increase
(c) Decrease
(d) Increase only to a stage when some other
factors becomes limiting
(e) None of these
57. When green algae are illuminated, motile aerobic
bacteria accumulate near them. The reason is
(a) Light (b) Oxygen
(c) Algae (d) CO2
(e) None of these
58. Which among the following sentence is TRUE
about C3 plants?
(a) Photosynthetically more efficient
(b) More efficient in CO2 fixation than C4 plants
(c) PEPCO is present in mesophyll
(d) Kranz anatomy is present
(e) First stable product is phosphoglyceric acid
59. C4 pathway is shown by
(a) Sugar cane (b) Sunflower
(c) Pea (d) Rice
(e) Rhizopus
60. Carbon becomes available to crop plants in the
form of
(a) Amino acids (b) Carbonates
(c) CO2 (d) Elemental C
(e) All of these
Answer key
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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13
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14
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15
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16
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17
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18
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19
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20
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A
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C
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C
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A
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C
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C
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B
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A
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D
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C
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D
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B
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A
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C
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C
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C
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C
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A
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C
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A
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21
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22
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23
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24
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25
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26
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27
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28
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29
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30
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31
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32
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33
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34
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35
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36
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37
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38
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39
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40
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B
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B
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D
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C
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C
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A
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B
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A
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D
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B
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A
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E
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C
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A
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B
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C
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B
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D
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C
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C
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41
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42
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43
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44
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45
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46
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47
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48
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49
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50
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51
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52
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53
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54
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55
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56
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57
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58
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59
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60
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A
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D
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A
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C
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B
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A
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D
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A
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C
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B
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A
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A
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D
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D
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B
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D
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B
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E
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A
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C
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