Correct : B. Chl a is blue green pigment with formula C55H72O5N4Mg
2. Chlorophyll a is absent in which of the following photosynthesising organisms ?
Correct : A. Bacteria
3. Photorespiration in C3 plants starts from.
Correct : B. phosphosglycolate
4. Which one of the following is wrong in relation to photorespiration ? It
Correct : C. is a characteristic of C4 plants
5. In sugarcane plant CO2 is fixed in malic acid, in which the enzyme that fixes CO2 is
Correct : B. phosphoenol pyruvic acid carboxylase
6. Plants are removed from patients room at night because
Correct : B. they produce CO2 all the time but release O2 also in day time
7. Who is that scientist who gave the Law of limiting factors ?
Correct : A. Blackman
8. Which of the following is correct for chlorophyll of cyanobacteria ?
Correct : B. Chl a = C55H72O5N4 Mg
9. How many electrons are involved for the formation of 1 mole of glucose and 6O2 molecules ?
Correct : B. 12
10. A. The atmospheric concentration of CO2 at which photosynthesis just compensation point.
R. The CO2 compensation point is reached when the amount of CO2 uptake is less than that generated through respiration because the level of CO2 in the atmosphere is more than that required for achieving CO2 compensation point.
Correct : C. If A is correct but R is wrong
11. Choose the correct statement.
Correct : C. Decarboxylation of C4 acids occurs in the mesophyll cells.
12. Match the names of scientists given under Column – I with their important contributions given under
Column – II ; choose the answer which gives correct combination of the alphabets :
Column – I(Scientists) Column – II(Contributions)
P. Peter Mitchell (i) Law of limiting factor
Q. Blackmann (ii) Dark reaction
R. Daniel Arnon (iii) Photosynthetic phosphorylation
S. Melvin Calvin (iv) Chemiosmotic hypothesis
t. Mass flow hyposhesis
Correct : A. P = (iv) Q = (i) R = (iii) S = (ii)
13. Match the following with correct combination
P. Carboxylation (i). Oxygen evolution
Q. Phosphorylation (ii) Photorespiration
R. Photolysis of water (iii) Rubisco
S. Phosphoglycolate (iv) Chemosynthesis
T. Nitrosomonas (v)ATP
Correct : B. P = (iii) Q = (v) R = (i) S = (ii) T = (iv)
14. During photosynthessis, plants
Correct : B. release O2, absorb CO2
15. A plant with low CO2 compensation point is
Correct : A. Atriplex patula
16. Rubisco is an enzyme for
Correct : B. photorespiration
17. Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because :
Correct : B. The primary fixation of CO2 is mediated via PEP carboxalase.
18. Stomata of CAM plants
Correct : C. open during the night and close during the day.
19. The Calvin cycle proceeds in three stages
1. reduction, during which carbohydrate is formed at the expense of the photochemically made ATP and NADPH
2. regeneration, during which the carbon dioxide acceptor ribulose – 1, 5 – biphosphate is formed
3. carboxylation, during which carbon dioxide combines with ribulose – 1, 5 - biophosphate
Correct : A. 3-1-2
20. A. Under conditions of high light intensity and limited CO2 supply, photorespiration has a useful role in protecting the plants from photo-oxidative damage.
R. If enough CO2 is not available to utilize light energy for carboxylation to proceed, the excess energy may not cause damage to plants.
Correct : D. If both A and R are false.
21. A. Photosynthestically C4 plants are less efficient then C3 plants.
R. The operaion of C4 pathway requires the involvement of only bundle-sheath cells.
Correct : D. If both A and R are false.
22. One of the following is electron donor to P680 during light reactions of photosynthesis.
Correct : D. Water
23. The requirement of assimilatory power to fix 6 molecules of CO2 is
Correct : D. 18 ATP, 12 NADPH
24. Photorespiration and photosynthesis both require
Correct : C. cytochromes
25. The chemical structure of chlorophyll ‘a’ varies from chlorophyll ‘b’ due to difference between.
Correct : C. CH3 and CHO
26. Choose the correct combinations of labelling the carbohydrate molecule involved in the Calvin cycle.
Correct : D. A – RuBP, B – PGAL, C – Triose phosphate
27. Chlorophyll molecules absorb light energy of wavelength
Correct : A. 300-400 nm
28. The reduction of ADP to ATP occurs by
Correct : B. high conc. of H+ ions across the membrane
29. The process of ATP formation from ADP in the presence of light in chloroplast is called
Correct : C. photophosphorylation
30. Photolysis of each water molecule in light reaction will yield
Correct : D. 2 electrons and 2 protons
31. The enzyme pair common to C3 plants and EMP is
Correct : B. aldolase and triose phosphate isomerase
32. Non-cycle photosphorylation is the main photochemical reaction in green plants because
Correct : A. it produces assimilatory power and oxygen
33. ................... is the by product of photosynthesis.
Correct : A. O2
34. Site of reduction of carbon is
Correct : D. stroma
35. In C4 plants, the primary CO2 acceptor is
Correct : D. PEP
36. It is estimated that about 85% of the earth’s photosynthetic activity is carried out by
Correct : C. phytoplanktons
37. In an experiment demonstrating the evolution of oxygen in Hydrilla, Sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable ?
Correct : D. Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate
38. In C4 plants, the bundle sheath cells.
Correct : D. have a high density of chloroplasts
39. In chlorophyll structure four pyrole rings are united with Mg by their atoms of
Correct : A. N
40. The fixation and reduction of CO2 occur in preence of
Correct : B. ATP and NADPH
41. Sugar moves in phloem vessels as ______.
Correct : D. sucrose
42. ____ ions help in photolysis of water.
Correct : D. both (a) and (c)
43. RUBISCO enzyme is also called as ______.
Correct : B. carboxy di mutase
44. ______ is precursor for abscissic acid (ABA)
Correct : C. Violaxanthin
45. In young leaves ratio of carotene to Xanthophyll is ____.
Correct : D. 1: 2
46. Which of the following pigments contains open pyrolle ring?
Correct : A. Phycobilin
47. In which of the following light, rate of photosynthesis is maximum?
Correct : B. discontinuous white
48. Quantum yield of photosynthesis is ______.
Correct : D. 12.5%
49. During light phase of photosynthesis ______ is oxidized and ______ is reduced.
Correct : C. Water and NADP
50. During dark phase of photosynthesis ______ is oxidized and ______ is reduced
Correct : D. NADPH2 and CO2
51. The visible product of photosynthesis is ______.
Correct : C. starch
52. To produce 3 glucose molecules ______ ATP and ______ NADPH2 molecules are required.
Correct : A. 54, 36
53. Glycolytic reversal is a part of ______.
Correct : D. dark phase of photosynthesis
54. RuBp carboxylase acts as RuBp carboxygenase at ______ CO2 conc. And ______ O2 conc.
Correct : B. low, hig
55. The source of CO2 during calvin cycle in C4 plant is
Correct : A. Malic acid
56. Dicot which follow C4 pathway is____.
Correct : B. Amranthus
57. Absorption spectrum of chlorophyll is maximum in _____ light.
Correct : B. blue
58. The oxygen molecule in glucose formed during photosynthesis comes from
Correct : C. CO2
59. Dimorphic chloroplast are present in ______.
Correct : D. all of these
60. Red pigment in tomato is
Correct : C. Lycopene
61. Solarisation refers to ______.
Correct : B. destruction of chlorophyll
62. Dark reaction requires light reaction for
Correct : C. reduction of PGA
63. Emerson effect proves
Correct : A. concept of two photosystem in plant
64. Name a plant which do not perform photosynthesis is
Correct : D. Pitcher plant
65. Light reaction of photosynthesis results in formation of ______.
Correct : D. All of these
66. C55H70O6N4 Mg is
Correct : D. All of these
67. The ionized chl.a+
Correct : A. Receives low energy electron
68. In Calvin cycle,
Correct : A. fructose 1,6 diphophate undergoes dephosphorylation.
69. What will happen to the rate of photosynthesis if sodium bicarbonate is added in the water having hydrilla plant in a beaker
Correct : D. It will be accelerated
70. Which of the following gas would disappear from the atmosphere if all the photosynthetic activities
were to stop?
Correct : D. Oxygen
71. Photo-oxidation of chlorophyll and cell contents as a result of high light intensity is known as
Correct : A. Solarization
72. Temperature is very high but a plant is showing photosynthesis with normal rate, probably it would be
Correct : D. Sugarcane plant
73. For the process of photosynthesis all except one of the following items are essential. Point out the exception
Correct : B. Glucose and oxygen
74. The prerequisities of Calvins cycle are
Correct : C. CO2, ATP, NADPH2
75. In the calvin cycle, the assimilatory power is used during
Correct : B. Conversion of PGA to PGAL
76. Which is sensitive to longer wavelength of light?
Correct : B. PSI
77. In chrophyll structure Phytol tail is present at
Correct : C. 7th carbon of IVth ring
78. Reduction of co-enzyme NADP depends on
Correct : C. Photolysis of water
79. Loculus is the internal space of
Correct : C. Thylakoid
80. Calvins cycle involves
Correct : C. Reductive carboxylation
81. In C4 plants, carboxylation is twice, it can be represented as
Correct : C. PEPA + CO2 and RuBP + CO2
82. In non-cyclic photophosphorylation, all the participants acts as electron donor and acceptor except
Correct : C. NADP
83. Ribbon shaped chloroplast is present in
Correct : B. Spirogyra
84. Which of the following protist is a photoautotroph
Correct : C. Diatoms
85. Photosynthesis takes place
Correct : C. In visible light obtained from any source
86. Chlorophyll-a differes from chlorophyll-b in having—
Correct : A. Methly group instead of aldehyde group
87. In non-cyclic photophosphorylation
Correct : D. All the above
88. In con-cyclic photophosphorylation, the electron emitted by P680 is replaced by electron from
Correct : B. Water
89. 85-90% (9/10) of all photosynthesis in the world is carried out by
Correct : B. Algae of the oceans
90. Primary and secondary processes of Photosynthesis takes place in ______ and ______ respectively.
Correct : D. Grana and stroma
91. Which one occurs during both cyclic and non-cyclic photophosphorylation
Correct : A. Formation of ATP
92. The photochemical process in photosynthesis which needs both PSI and PSII also involves
Correct : D. All of these
93. For synthesis of one molecule of glucose, the requirement of ATP and NADPH2 is respectively
Correct : D. 18 and 12
94. Which of the following element is needed for chlorophyll biosynthesis?
Correct : B. Magnesium
95. The two enzymes responsible for primary carboxylation in C3 and C4 pathway, respectively are
Correct : C. RuBP carboxylase and PEP carboxylase
96. _______ are placed one above the other to form stack of coins
Correct : D. thylakoids
97. Unidirectional flow of e- in non-cyclic photophosphorylation is
Correct : B. Water PS-II PS-I NADP
98. The head and tail of chlorophyll are made up of
Correct : C. Pophyrine and phytol
99. The numbner of photons needed for the evolution of one molecule of oxygen is
Correct : A. 8
100. Action spectrum is
Correct : B. A graph showing rate of photosynthesis