NEET Biology MCQs Photosynthesis in Higher Plants [Free PDF]

NEET Biology MCQs Photosynthesis in Higher Plants – Sample

1. As compound to a C3-plant, how many additional molecules of ATP are needed for net production of one
   molecule of hexose sugar by C4-plants?
   a) 2 b) 6 c) 0 d) 12
2. Proton gradient is broken down due to
   a) Movement of electrons across the membrane to stroma
   b) Movement of electrons across the membrane to lumen
   c) Movement of proton across the membrane to lumen
   d) Movement of proton across the membrane to stroma
3. Which of the following is a simplified equation of photosynthesis?
   a) CO2+2H2OLight energy → Chlorophyll
   C5H10O4+H2O+O2↑ b) CO2+2H2OLight energy → Chlorophyll
   (CH2O)n+O2↑
   c) CO2+2H2OLight energy → Chlorophyll
   C3H6O3+CO2+O2↑ d) CO2+2H2OLight energy → Chlorophyll
   (CH2O)n+H2O+O2↑
4. The membrane of thylakoid is called
   a) Cell membrane b) Fret membrane
   c) Granum membrane d) Thylakoid membrane
5. The enzyme responsible for primary carboxylation in C3-plants is
   a) Hexokinase b) Succinic dehydrogenase
   c) Pyruvate carboxylase d) RuBP carboxylase oxygenase
6. The law of limiting factors was proposed with particular reference to photosynthesis. Identify the
   scientise, who proposed this law?
   a) Calvin b) Weismann c) Emerson d) Blackman
7. The synthesis of one molecule of glucose during Calvin cycle requires
   a) 12 molecules of ATP and 18 molecules of NADPH2
   b) 6 molecules of ATP and 12 molecules of NADPH2
   c) 18 molecules of ATP and 12 molecules of NADPH2
   d) 12 molecules each of ATP and NADPH2
8. The enzymatic reactions incorporate CO2 into the plants leading to the synthesis of sugar in
   a) Stroma b) Stroma lamella c) Grana d) Both (a) and (b)
9. In CAM-plants, carbon dioxide acceptor is
   a) RuBP b) PEP c) OAA d) PGA
10. PEP carboxylase
    I. is involved in atleast some CO2 fixation in both C3 and C4-plants
    II. Catalyses the reaction of fixing CO2 into pyruvic acid in bundle sheath cells
    III. is capable of fixing CO2 more efficiently at lower atmospheric CO2 concentration than RuBP
    carboxylase
    Select the correct option
    a) I and II b) II and III c) I, II and III d) Only III
11. Which factor is not limiting in normal condition for photosynthesis?
    a) Air b) Carbon dioxide c) Water d) Chlorophyll
12. PS is made up of which of the following?
    a) Reaction centre b) Antenna molecule

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c) Both (a) and (b) d) Reaction centre and H2O

13. In higher plants, the shape of the chloroplast is
    a) Discoid b) Cup-shaped c) Girdle-shaped d) Reticulate
14. Identify the correct combination of the following
    substrate enzyme Product
    I.
    Phosphoen-ol
    pyruvate
    PEP
    carboxylase
    C4 acid
    II. Malate Malic
    enzyme
    C4 acid
    III. RuBP Ribulose 5
    phosphate
    kinase
    C3 acid
    IV.
    Pyruvate
    Pyruvate
    dikinase
    C3 acid a) III and IV b) I and II c) II and III d) I and IV
15. Cyclic photophosphorylation produces
    a) NADPH b) ATP c) ATP+NADPH2 d) ATP+NADPH2+O2
16. Phenomenon which converts light energy into chemical energy is
    a) Respiration b) Photosynthesis c) Transpiration d) None of these
17. In the given chart of photophosphorylation. What does ‘A’ represent? a) PC b) FRS c) PQ d) Cyt –𝑎3
18. In photosystem, antennae includes all pigments except
    a) Chlorophyll-a b) Chlorophyll-b c) Carotenoids d) Xanthophyll
19. I. Tomato
    II. Black pepper
    III. Mango
    From the above option choose the correct answer in respect of green house crops
    a) I and III b) III and II c) I, II and III d) I and II
20. Plastocyanin contains
    a) Copper b) Iron c) Calcium d) potassium
21. The two pigment system theory of photosynthesis was proposed by
    a) Blackman b) Hill c) Emerson d) Arnon
22. Which one of the following is not true about the light reactions of photosynthesis?
    a) Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS
    II
    b) The flow of electrons from water to NADP in non-cyclic electron transport produces one ATP

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c) Reactions of the two photosystems are needed for the reduction of NADP
d) P680 and P700are the reaction centres of PS-I and PS-II respectively

23. By which plant pigment maximum absorption of radiation takes place in the blue and red regions of
    absorption spectrum?
    a) Chlorophyll-a b) Chlorophyll-b c) Xanthophyll d) Carotenoid
24. Factors affecting photosynthesis are
    I. number and size of leaves
    II. age and orientation of leaves
    III. amount of chlorophyll
    IV. amount of O2 and CO2
    Select the correct option
    a) I, II and IV b) II, IV and V c) IV, V and I d) I, II, III and IV
25. In an experiment, a leaf was partially covered with black paper, and other one was exposed to light. On
    testing these leaves for starch, in the presence of sunlight, on may conclude that photosynthesis had
    occurred in
    a) Green part of leaves b) Black paper covered part of leaves
    c) Both (a) and (b) d) None of the above
26. I. It is the characteristic of C4-plants
    II. It is the characteristic of C3-plants
    III. It occurs in chloroplast
    IV. It occurs in day time
    V. It occurs in night
    Select the correct options in relation to photorespiration
    Correct option Incorrect option
    a) I, IV II, III, IV b) II, III, IV I, V
    c) I, II, III IV, V d) IV, V I, II, III
27. First reaction in photosynthesis is
    a) Photolysis of water b) Excitation of chlorophyll molecule
    c) Formation of APT d) Fixation of CO2
28. Kranz anatomy is a morphological diversity in the leaves of
    a) 𝐶3-plants b) 𝐶4-plants c) Both (a) and (b) d) CAM-plants
29. Which of the following is concerned with carbon dioxide fixation?
    a) Krebs cycle b) Calvin cycle c) Ornithine cycle d) Glycolysis
30. Hill reaction occurs in
    a) High altitude plants b) Total darkness
    c) Absence of water d) Presence of ferricyanide
31. Rubisco enzyme is absent in
    a) Mesophyll cell b) Bundle sheath cell c) C3-plants d) C4-plants
32. During the experiment in laboratory, the thylakoid is some how punctured so that the interior of the
    thylakoid is no longer separated from stroma. This damage will have the direction effect on
    a) ATP formation b) Absorption of light
    c) Flow of electrons from PS-I to PS-II d) All of the above
33. The graph below shows the relation between light intensity and the giving off and taking up of carbon
    dioxide by the leaves of a plant. Why is most carbon dioxide given off when the light intensity is zero units?

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a) Because it is just the start of the experiment
b) Only respiration is taking place at this intensity of light
c) Only photosynthesis is taking place at this intensity of light
d) The rate of photosynthesis is equivalent to the rate of respiration

34. Cyclic photophosphorylation results only in the
    a) Formation of ATP b) Formation of NADP++H+ and ATP
    c) Formation of NAD++H+ d) Formation of ADP + Pi
35. I. H2S not H2O is involved in photosynthesis of sulphur bacteria
    II. ATP is produced during light reaction 𝑣𝑖𝑎 chemiosmosis
    III. Absence of light leads to the stoppage of photosynthesis
    IV. Calvin cycle occurs in grana
    Select the correct option
    a) II, III and IV b) I, III and IV c) I, II and IV d) I, II and III
36. Under normal condition, which one of the following is a major limiting factor?
    a) Light b) CO2 c) Temperature d) Chlorophyll
37. Which one is essential for the respiration as well as photosynthesis?
    a) Rubisco b) Plastocyanin c) Ubiquinone d) Cytochrome
38. Light Harvesting Complex (LHC) is
    a) One molecule of chlorophyll-a b) Very few molecule of chlorophyll-a
    c) Hundereds of pigment molecules bound to
    proteins
    d) Chlorophyll-a + chlorophyll-c + protein + DNA
39. Which of the following represents the correct molecular formula of chlorophyll-b ?
    a) C55H72O6N4Mg b) C55H72O5N4Mg c) C55H72O4N4Mg d) C55H70O6N4Mg
40. In C4-plants, the bundle sheath cells
    a) Have thin walls to facilitate gaseous exchange b) Have large intercellular spaces
    c) Are rich in PEP carboxylase d) Have a high density of chloroplasts
41. The following (I-IV) are the main steps of chemosynthetic ATP synthesis in the light reaction. Arrange
    them in correct order
    I. H+ concentration gradient established
    II. H+ diffuses through ATP synthetase
    III. Carriers use energy from electrons to move H+ across the membrane
    IV. Electrons from PS-II pass along electron transport chain
    V. Light excites electrons in PS-II
    VI. Energy of H+ flow is used by ATP synthetase to make ATP
    a) I, II, III, IV, V, IV b) II, IV, V, III, II, VI c) V, IV, III, I, II, VI d) V, VI, III, IV, II, I
42. What is the wavelength of radiations in visible sectrum?
    a) 400-700 nm b) 400-800 nm c) 390-760 nm d) 760-390 nm
43. Which of the following is not related to photorespiration?
    a) Lysosome b) Chloroplast c) Peroxisome d) Mitochondria
44. The internal factors that affects photosynthesis of plant depends on the

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a) Morphological predisposition b) Genetic predisposition
c) Temperature d) Environment predisposition

45. How many H+ ions are formed from 12 water molecules during non-cyclic photophosphorylation?
    a) 12 b) 24 c) 36 d) 48
46. In non-cyclic photophosphorylation, there is photolysis of 12 water molecules. How many H+ are formed?
    a) 24 H+ b) 36 H+ c) 12 H+ d) 32 H+
47. Maximum photosynthesis occurs in
    a) Red light b) Blue light c) Green light d) Violet light
48. I. Initial CO2 acceptor
    II. Extent of photorespiration
    III. Enzyme catalysing reaction that fixes CO2
    IV. Presence of Calvin cycle
    V. Leaf anatomy
    Which one does not differ in a C3 and C4-plants?
    a) I and V b) Only IV c) II and III d) Only II
49. Energy transfer in photosynthesis occurs as
    a) Phycoerythrin→ phycocyanin →carotenoid →chlorophyll-a
    b) Chlorophyll-b →carotenoid →phycoerythrin →chlorophyll-a
    c) Phycocyanin→phycoerythrin→ carotenoid→ chlorophyll-a
    d) Chlorophyll-b→ carotenoid→ phycocyanin→ chlorophyll-a
50. What is true for photosynthesis?
    a) Carbon dioxide is oxidised and water is reduced
    b) Carbon dioxide is reduced and water is oxidised
    c) Both carbon dioxide and water are reduced
    d) Both carbon dioxide and water are oxidised
51. Which of the following statement is false in case of (C4-plant)?
    a) CO2 acceptor is RuBisCo in mesosphyll cell
    b) Carboxylation occurs in mesophyll cells
    c) Leaves have two cell types
    d) Mesophyll cells lack Rubisco
52. Chlorophyll in chloroplasts is located in
    a) Grana b) Pyrenoid c) Stroma d) Both (a) and (b)
53. Which photosystem is involved in cyclic photophosphorylation?
    a) PS-II b) PS-I
    c) Xanthophyll and PS-II d) Xanthophyll and PS-I
54. The mechanism of ATP formation both in chloroplast and mitochondria is explained by
    a) Relay pump theory of Godlewski b) Cholodny-Went’s model
    c) Chemiosmotic theory d) Munch’s mass-flow hypothesis
55. Absorption spectrum of chlorophyll-𝑎 and the action spectrum of photosynthesis is identical because
    chlorophyll-𝑎
    a) Absorbs the maximum light b) Absorbs the minimum light
    c) Absorbs the red and blue light d) Is found most abundantly
56. Which would do maximum harm to a tree?
    a) Loss of half of its branches b) Loss of all its bark
    c) Loss of all its leaves d) Loss of half of its leaves
57. Pyruvate + ATP 𝑦 → PEP+AMP+H3PO4
    Identify-𝑦 in the given reaction and choose the correct option
    a) Phosphopyruvate dikinase b) Phosphopyruvate monokinase
    c) Phosphopyruvate dikinase d) Phosphopyruvate dehydrogenase
58. A wastage process is

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a) Respiration b) Photosynthesis c) Photorespiration d) Movement

59. How many molecules of glycine is required to release one CO2 molecule in photorespiration?
    a) One b) Two c) Three d) Four
60. Choose the correct statement.
    a) The C4-plants do not have RUBISCO
    b) Carboxylation of RuBP leads to the formation of PGA and phosphoglycolate
    c) Carboxylation of phosphoenol pyruvate results in the formation of C4-plants
    d) Decarboxylation of 𝐶4-acids occur in the mesophyll cells
61. Conditions helpful in photorespiration are
    a) More oxygen and less carbon dioxide b) Less oxygen and more carbon dioxide
    c) More temperature and less oxygen d) More humidity and less temperature
62. Which of the following is/are the raw material for photosynthesis?
    I. H2O II. CO2
    III. Light IV. Chlorophyll
    Choose the correct option
    a) II, III and IV b) I and IV c) I, II and III d) I, II, III and IV
63. The special structure present in C4-plants in
    a) Thin cuticle b) Multi-layered epidermis
    c) Kranz type body d) One-layered epidermis
64. In which of the following form glucose is usually stored in plants?
    a) Lipid b) Carbohydrates c) Protein d) Starch
65. A student sets up an experiment on photosynthesis as follow : He takes soda water in a glass tumbler and
    add a chlorophyll extracts into the contents and keeps the tumbler exposed sunlight hoping that he has
    provided necessary ingredient for photosynthesis to proceed (viz, CO2, H2O, chlorophyll and light).
    What do you think what will happen after, say few hours of exposure of light?
    a) Photosynthesis will take place and glucose will
    produced
    b) Photosynthesis will take place and starch will be
    produced which will turn the mixture turbid

c)
Photosynthesis will not take place because CO2
dissolves in soda water escapes into the
atmosphere
d) Photosynthesis will not take place because intact
chloroplasts are needed for the process

66. With respect to compensation point, which of the following is true for C3 and C4-plants
    a) Compensation points of C3 and C4- plants are
    equal b) Compensation points of C3- plant is higher than
    C4-plants
    c) Compensation points of C4-plant is higher than C3-
    plants
    d)
67. Light energy in photosynthesis is utilized in
    a) H2O converted into H2 b) ADP converted into ATP
    c) ATP converted into ADP d) None of the above
68. Identify A, B, C and D in the given diagram of z-scheme of light reaction and choose the correct option
    accordingly a) A-𝑒− acceptor, B-ETS, C-PS-II, D-PS-I b) A-𝑒− acceptor, B-ETS, C-PS-I, D-PS-II
    c) A-ETS, B-𝑒− acceptor, C-PS-I, D-PS-II d) A-ETS, B-𝑒− acceptor, C-PS-II, D-PS-I
69. PEP+CO2+H2O 𝑥 → Oxaloacetic acid +H3PO4

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Identify 𝑋
a) Ligase b) Oxidoreductase c) PEP carboxylase d) Lyase

70. Stroma lamellae membrane lacks
    I. PS-II
    II. NADP reductase
    III. non-cyclic photophosphorylation
    Select the correct option
    a) I and II b) II and III c) III and I d) I, II and III
71. RUBISCO stands for
    a) Ribulosebisphosphate carboxylase oxygenase
    b) Ribulose phosphate carboxylase oxygenase
    c) Ribulose phosphate carboxylic oxygenase
    d) None of the above
72. In chloroplasts, chlorophyll is present in the
    a) Outer membrane b) Inner membrane c) Thylakoids d) stroma
73. DCMC
    a) Inhibits PS-I
    b) Inhibits PS-II
    c) Destroy chloroplast
    d) Inhibits oxidative phosphorylation
74. Malic acid (4-C) is produced in which plant without Kranz anatomy?
    a) Bryophyllum b) Kalanchoe c) Opuntia d) All of these
75. What is the advantage of light reactions producing ATP and NADPH2 on stromal side of thylakoid
    membrane?
    a) Calvin cycle consumes ATP and NADPH2 from stroma
    b) Light reaction occurs in stroma
    c) Dark reaction occurs in grana need ATP + NADPH2
    d) CO2 is produced in stroma
76. Generally, plants adapted to dry tropical conditions have
    a) C2 pathway b) C3 pathway c) C5 pathway d) C4 pathway
77. Correct sequence of rate of photosynthesis in different light is
    a) Red > Blue > Green b) Blue > Red > Green c) Green > Blue > Red d) Green > Red > Blue
78. During the light reaction, the water splits into
    a) H+,O2 electrons b) H2,O2 electrons c) 2H+, 1
    2
    O2 2 electrons d) 1
    2
    H2, 1
    2
    O2 electrons
79. Adenosine diphosphate contains
    a) One high energy bonds b) Two high energy bonds
    c) Three high energy bonds d) Four high energy bonds
80. The thylakoids are aggregated to form stalks of discs called
    a) Stroma b) Grana
    c) Stroma thylakoids d) Intergranal thylakoids
81. Which hypothesis best explains the synthesis of ATP in chloroplast?
    a) Chemosynthetic hypothesis b) Chemiosmotic hypothesis
    c) Potential gradient hypothesis d) Redox gradient hypothesis
82. In dark cycle, one molecule of glucose formation needed
    a) 12 ATP and 12 NADPH b) 14 ATP and 12 NADPH
    c) 16 ATP and 12 NADPH d) 18 ATP and 12 NADPH
83. The main photosynthetic pigments in the plants are
    a) Chlorophyll-a and chlorophyll-c b) Chlorophyll-a and chlorophyll-d
    c) Chlorophyll-b and chlorophyll-a d) Chlorophyll-b and chlorophyll-c

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84. Radioactive C14 is given to carbon dioxide and released to atmosphere. This carbon dioxide is taken by
    RuBP in a C3-plants. First radioactive C14is seen, in which compound?
    a) PGAL b) PEP c) RMP d) PGA
85. Example of water soluble plant pigment is
    a) Chlorophyll-𝛼 b) Chlorophyll-𝑏 c) Anthocyanin d) xanthophyll
86. PS-I and PS-II were discovered by
    a) Robert Emerson b) Blackman c) Robert Mayer d) Arnon
87. Photorespiration is also called
    I. Glycolate pathway
    II. C3-cycle
    III. Oxidative photosynthetic carbon cycle
    Select the correct option
    a) I and II b) II and III c) III and I d) I, II and III
88. ‘Hatch and Slack’ cycle is found in
    a) C4-plants b) C3-plants c) Both (a) and (b) d) None of these
89. Which of the following statements is true with regard to light reaction of photosynthetic mechanism in
    plants?
    a) Chlorophyll-𝛼 occurs with peak absorption at 680 nm in photo system-I and at 700 nm in photo system
    II
    b) Magnesium and sodium ions are associated with photolysis of water molecules
    c) O2 is evolved during cyclic photophosphorylation
    d) Photo system-I and II are both involved in non-cyclic photophosphorylation
90. Photosynthesis convert radient or solar energy into the
    a) Physical energy b) Latent energy c) Chemical energy d) Oxidation energy
91. Photolysis of each water molecule in light reaction will yield
    a) 2 electrons and 4 protons b) 4 electrons and 4 protons
    c) 4 electrons and 3 protons d) 2 electrons and 2 protons
92. Which of the following is the first compound that accepts carbon dioxide during dark phase of
    photosynthesis?
    a) NADP b) RuBP c) Ferredoxin d) Cytochrome
93. In a CAM-plant, the concentration of organic acid
    a) Increases during the day b) Decreases or increases during the day
    c) Increases during night d) Decreases during any time
94. If photosynthesising, green algae are provided with CO2 labelled with an isotope of oxygen (O18), later
    analysis showed that all of the following compounds produceds by the algae contains 18O except
    a) PGA b) RuBP c) Glucose d) O2
95. Phytochrome occurs is two forms. In which from it promotes the germination of seeds of some species?
    a) Pfr from b) Pr from c) Both (a) and (b) d) None of these
96. Solarisation is
    a) Formation of chlorophyll b) Destruction of chlorophyll
    c) Utilization of sunlight d) Effects of solar light
97. C4-pathway is a regular mode of CO2 fixation in
    I. dicots
    II. pteridophytes
    III. monocots
    Select the correct option
    a) I and II b) I and III c) II and II d) I, II and III

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