NEET Biology Chapter Wise Mock Test – Photosynthesis
1. Photosynthesis is a process, in which
(a) light energy is converted into chemical energy
(b) chemical energy is converted into light energy
(c) chemical energy is converted into chemical energy
(d) organic chemicals are broken down
2. Photosynthesis is a
(a) catabolic and reductive reaction
(b) catabolic and oxidative reaction
(c) anabolic and reductive reaction
(d) catabolic and exothermic reaction
3. Phenomenon, which converts light energy into chemical energy is called
(a) respiration
(b) photosynthesis
(c) transpiration
(d) None of these
4. During photosynthesis
(a) water gets reduced and cSrbon dioxide gets oxidised
(b) C02 gets reduced and water gets oxidised
(c) both carbon dioxide and water get reduced
(d) Both (a) and (b)
5. Which of the following equation correctly sums up photosynthetic reaction?
6. Which evidence confirmed that 02 released in photosynthesis comes from water?
(a) Isolated chloroplast in water releases 02 if supplied potassium ferrocyanide (reducing agent)
(b) Photosynthetic bacteria use H2S and C02 to make carbohydrates, H20 and sulphur
(c) Isotopic 02 supplied as H20 appears in the 02 release in photosynthesis
(d) All of the above
7. What other substance evolve in photosynthesis besides oxygen?
(a) C02
(b) H20
(C) H2
(d)N2
8. Chemosynthetic bacteria obtain energy from ,
(a) sun
(b) inorganic chemical?
(c) organic substances
(d) infra-red rays
9. In blue-green algae, photosystem-ll contains important pigment concerned with photolysis of water. It is a
(a) phycocyanin
(b) cytochrome-c
(c) chlorophyll-b
(d) p-carotene
10. Some anaerobic photosynthetic bacteria use other hydrogen donors like H2S instead of water because
(a) they cannot tolerate oxygen
(b) other donors are freely available in the growth medium
(c) other donors need less energy input
(d) other donors yield more glucose molecules
11. Chlorophyll in chloroplasts is located in
(a) grana
(b) pyrenoid
(c) stroma
(d) Both (a) and (c)
12. In angiosperms, synthesis of chlorophyll occurs in presence of
(a) phytochrome
(b) cytochrome
(c) light
(d) All of these
13. In photosynthesis, chlorophyll serves as
(a) hydrogen acceptor
(b) hydrogen donor
(c) energy convertor
(d) raw material
14. All photosynthetic green plants contain
(a) chlorophyll-a
(b) chlorophyll-b
(c) chlorophyll-c
(d) chlorophyll-e
15. The graph showing rate of photosynthesis at different wavelengths of light is called
(a) absorption spectrum
(b) action spectrum
(c) Both (a) and (d)
(d) None of these
16. The wavelength of light absorbed by Pr form of
phytochrome is
(a) 640 nm
(b) 680 nm
(c) 720 nm
(d) 620 nm
17. Action spectrum of photosynthesis was described by
(a) Calvin in 1883
(b) Englemann in 1883
(c) Arnon in 1890
(d) Hill in 1964
18. The chlorophylls absorb visible light in the region of the following wavelengths
(a) 400-500 nm
(b) 600-800 nm
(c) 400-500 nm and 600-700 nm
(d) None of the above
19. Wavelength of light, which is maximum absorbed by chlorophyll is
(a) 400-510 nm
(b) 700-900 nm
(c) 300-400 nm
(d) 600-700 nm
20. Discovery of Emerson’s effect has clearly shown the existence of
(a) photorespiration
(b) photophosphorylation
(c) light and dark reaction in photosynthesis
(d) two distinct photochemical reactions or processes
21. ‘Red drop’ in photosynthesis in green algae refers to decrease in the rate of photosynthesis in
(a) red light greater than 680 nm
(b) red light less than 680 nm
(c) green light
(d) blue light
22. Red drop occurs in wavelengths of
(a) 495 nm
(b) 680 nm
(c) 560 nm
(d) 586 nm
23. Functional unit of photosynthesis is known as
(a) electron
(b)photon
(c) chlorophyll
(d) quantasome
24. Photocentres in higher plants are
(a) P700
(b) Peso
(c) Chlorophyll-a
(d) Both (a) and (b)
25. The source of energy for carbon assimilation is
(a) water
(b) sunlight
(c) carbon dioxide
(d) chlorophyll
26. Evolution of 02 in the suspension of an isolated chloroplast in light in the presence of ferric salts is called
(a) Emerson’s effect
(b) Oxygenation
(c) Hill’s reaction
(d) Blackman’s reaction
27. The first step in photosynthesis is the
(a) formation of ATP
(b) photolysis of water
(c) excitement of an electron of chlorophyll by a photon
(d) joining of 3-carbon atom to form glucose
28. PS-II is concerned with
(a) photolysis of water
(b) flowering
(c) reduction of C02
(d) release of energy
29. Non-cyclic photophosphorylation involves
(a) PS-I . (b) PS-II
(c) Both (a) and (b) (d) None of these
30. During photosynthesis, oxygen is liberated by oxidation of
(a) C02 (b) H20
(c) phosphoglyceraldehyde
(d) None of these
31. In photosystem-l, the first electron acceptor is
(a) ferredoxin
(b) cytochrome
(c) plastocyanin
(d) an iron-sulphur protein
32. What will be the direction of energy flow between PS-I and PS-I I when two pigment systems absorb light?
(a) PS-II-* PS-I
(b) PS-l-> PS-II
(c) Both (a) and
(b) (d) None of these
33. The first acceptor of electrons from an excited chlorophyll molecule of photosystem-l I is
(a) cytochrome
(b) iron-sulphur protein
(c) ferredoxin
(d)quinone
34. The electrons liberated from PS-II go to
(a) carotenoids
(b) plastocyanin
(c) ferredoxin
(d) plastoquinone
35. Photosynthetic Active Radiation (PAR) has the following range of wavelengths
(a) 400-700 nm
(b) 450-950 nm
(c) 340-450 nm
(d) 500-600 nm
36. Assimilatory power in photosynthesis refers to
(a) ATP+APH2+02 (b) ATP+NADPH2
(c) ATP (d) NADPH2
37. Which one is Hill oxidant?
(a) Indophenol
(b) Dichloropheriol
(c) Ferricyanide, chromate add benzoquinone
(d) All of the above
38. Photosynthetic enhancement with flashing light was first observed by
(a) Benson and Calvin
(b) Hill and Calvin
(c) Hatch and Slack
(d) Emerson and Arnon
39. During light reaction of photosynthesis, which of the following phenomenon is observed during cyclic phosphorylation as well as non-cyclic phosphorylation?
(a) Formation of ATP
(b) Formation of NADPH2
(c) Release of 02
(d) Photorespiration
40. In pigment system-l, the carrier that picks up electrons fromP700 is
(a) Fe-protein
(b) Fe-S protein
(c) Fe-Cu protein
(d) Fe-Mg protein
41. Splitting of water is associated with
(a) photosystem-l
(b) lumen of thylakoid
(c) Both photosystem-l and II
(d) inner surface of thylakoid membrane
42. Which one of the following categories of organisms does not evolve oxygen during photosynthesis?
(a) Red algae
(b) Photosynthetic bacteria
(c) C4-plants with Kranz anatomy
(d) Blue-green algae
43. ATP formation during photosynthesis is known as
(a) photophosphorylation
(b) phosphorylation
(c) oxidative phosphorylation
(d) None of the above
44. Photophosphorylation is a process, in which
(a) light energy is converted into chemical energy by production of ATP
(b) glutamic acid is formed
(c) 2 PGA is formed
(d) None of the above
45. NADP is coverted into NADPH2 in
(a) photosystem-ll
(b) photosystem-l
(c) Calvin cycle
(d) non-cyclic photophosphorylation
46. The synthesis of ATP in both photosynthesis and respiration is essentially an oxidation process, in which energy is utilised from the
(a) electron
(b) C02
(c) cytochromes
(d) 02
47. The correct sequence of two of electrons in the light reaction is
(a) PS-1, plastoquinone, cytochromes, PS-1, ferredoxin
(b) PS-II, ferredoxin, PS-1
(c) PS-1, ferredoxin, PS-II
(d) PS-1, plastoquinone, cytochromes, PS-II, ferredoxin
48. Products of light reaction in photosynthesis are
(a) ATP and NADPH2
(b) ADP and glucose
(c) ferredoxin and cytochrome-b6
(d) cytochromes
49. Calvin cycle occurs in which of the following organelles?
(a) Mitochondria
(b) Chloroplast
(c) Cytoplasm
(d) Glyoxysomes
50. In dark reaction, first stable product of photosynthesis inCg-plants is
(a) malic acid
(b) oxaloacetic acid
(c) 3-phosphoglyceric acid
(d) phosphoglyceraldehyde
51. RuBisCO (RuBP carboxylase/oxygenase) a protein, which comprises
(a) 5% of total chloroplast protein
(b) 11 % of total chloroplast protein
(c) 31 % of total chloroplast protein
(d) 16% of total chloroplast protein
52. During formation of 1, 3-diphosphoglyceric acid from 3-phosphoglyceric acid, the phosphate donor is
(a) H3P04
(b) ATP
(c) ADP
(d) GTP
53. RuBP carboxylase enzyme catalyses the carboxylation reaction between
(a) C02 and ribulose-1,5-bisphosphate
(b) acetyl Co-A and oxaloacetic acid
(c) PGA and dihydroxy acetone phosphate
(d) ribulose bisphosphate and phosphoglyceraldehyde
54. In Cg-plants, the first stable product of photosynthesis during the dark reaction is
(a) malic acid
(b) oxaloacetic acid
(c) 3-phosphoglyceric acid
(d) phosphoglyceraldehyde
55. How many molecules of inorganic phosphate molecules are generated in Calvin cycle in the formation of PGAL?
(a) 12
(b) 6
(c) 17
(d) 18
56. For yielding one molecule of glucose the Calvin cycle turns
(a) two times
(b) four times
(c) six times
(d) eight times
57. Fixation of one molecule of C02 through Calvin cycle requires
(a) 3 ATP and 3 NADPH2 molecules
(b) 3 ATP and 2 NADPH2 molecules
(c) 2 ATP and 1 NADPH2 molecules
(d) 1 ATP and 2 NADPH2 molecules
58. How many times C3-cycle is repeated for the production of one molecule of hexose sugar?
(a) 2
(b) 4
(c)6
d)8
59. In C4-pathway, C02 fixation occurs in chloroplast of
(a) spongy parenchyma
(b) mesophyll cells
(c) guard cells
(d) bundle sheath cells
60. Kranz anatomy is peculiar feature of
(a) C3-plants
(b)C4-plants
(c) CAM-plants
(d)C2-plants
61. C02 acceptor in C4-plants is
(a) ribulose-1,5-bisphosphate
(b) oxaloacetic acid
(c) ribulose-1, 6-bisphosphate
(d) phosphoenol pyruvate
62. In the leaves of C4-plants, malic acid formation during C02 fixation occurs in the cells of
(a) mesophyll
(b) bundle sheath
(c) phloem
(d) epidermis
63. Which of the following statements is not correct for C4-plants?
(a) These are less efficient for photosynthesis
(b) These are less efficient for photorespiration
(c) They have Kranz anatomy in their leaves
(d) They use PEP as C02 acceptor
64. During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3-Phosphoglyceric Acid (PGA) are derived from
(a) RuBP
(b) C02
(c) RuBP + C02
(d) RuBP +C02 +PEP
65. Photosynthesis in C4-plants is relatively less limited by atmospheric C02 levels because
(a) four carbon acids are the primary initial C02 fixation products
(b) the primary fixation of C02 is mediated via PEP carboxylase
(c) effective pumping of C02 into bundle sheath cells
(d) RuBisCO in C4-plants has higher affinity for C02
66. C4-plants are more efficient in photosynthesis than C3-plants due to
(a) the higher leaf area
(b) the presence of larger number of chloroplasts in the leaf cells
(c) the presence of thin cuticle
(d) the lower rate of photorespiration
67. The C4-plants differ from C3-plqnts in
(a) type of pigments involved in photosynthesis
(b) number of ATPs evolved in formation of sugar
(c) the substance that accepts C02 during assimilation
(d) type of end products of photosynthesis
68. For each molecule of glucose formed in plants, the number of molecules of ATP and NADPH2 required are respectively
(a) 18 and 12
(b) 12 and 18
(c) 15 and 10
(d) 12 and 20
69. As compard to a C3-plant, how many additional molecules of ATP are needed for the net production of one molecule of hexose sugar by C4-plants
(a) 2
(b) 6
(c) 0
(d) 12
70. How many ATP and NADPH2 molecules are used for the fixing of one molecule of C02?
(a) Three and two respectively
(b) Three each
(c) Two each
(d) Two and three respectively
71. CAM helps the plants in
(a) secondary growth
(b) disease resistance
(c) reproduction
(d) conserving water
72. In the C4-plants, C4-cycle occurs in the mesophyll cells and C3-cycle occurs in bundle sheath cells, whereas in CAM plants
(a) C4 and C3-cycle occurs in the mesophyll cells only
(b) C4-cycle occur in bundle sheath cells and C3-cycle in mesophyll cells
(c) C4-cycle very rarely
(d) C4 and C3-cycle occurs in bundle sheath cells .
73. High C02 compensation point is found in
(a) C3-plants
(b) C4-plants
(c) CAM-plants
(d) algae
74. Compensation point is the value of a factor where, there is
(a) beginning of photosynthesis
(b) little photosynthesis
(c) photosynthesis equal to rate of respiration
(d) None of the above
75. With the increase in light intensity the translocation rate
(a) decreases in roots and shoot both
(b) increases equally in roots and shoot both
(c) increases more in roots than shoot
(d) increases more in the shoot than roots
76. Plants adapted to low light intensity have
(a) larger photosynthetic unit size than the sun plants
(b) higher rate of C02 fixation than the sun plants
(c) more extended root system
(d) leaves modified to spines
77. Solarisation is a process in which
(a) chlorophyll is found
(b) sugars are’formed with the help of solar energy
(c) destruction of chlorophyll and ultimate death of living organism
(d) None of the above
78. Carbon dioxide joins the route of photosynthesis during
(a) photosystem-l
(b) photosystem-l I
(c) dark reaction
(d) light reaction
79. Warburg effect is decreased rate of photosynthesis at
(a) low concentration of C02
(b) high concentration of C02 .
(c) high concentration of 02
(d) None of the above
80. Optimum temperature for photosynthesis is
(a) 10-15°C
(b) 20-35°C
(c) 25-35°C
(d) 35-40°C
Direction (Q. Nos. 81-84) In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true, but Reason is not correct explanation of Assertion.
(c) If Assertion is true, but Reason is false.
(d) If both Assertion and Reason are false.
81. Assertion Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.
82. Assertion Photosynthetically C4-plants are less efficient than C3-plants.
Reason The operation of C4-pathway requires the involvement of only bundle sheath cells.
83. Assertion C4-photosynthetic pathway is more efficient than the C3-pathway.
Reason Photorespiration is suppressed in C4-plants.
84. Assertion The atmospheric concentration of C02 at which photosynthesis just compensates for respiration is referred to as C02 compensation point.
Reason TheC02 compensation point is reached when the amount of C02 uptake is less than that generated through respiration because the level of C02 in the atmosphere is more than that required for achieving CO2 compensation point.
85. Match the following columns.
Codes
A B C D
(a) 4 5 1 2
(b) 1 2 3 4
(c) 4 5 2 1
(d) 1 3 4 5
86. Match the following columns.
Codes
A B C D
(a) 1 2 3 4
(b) 4 1 5 2
(c) 5 4 2 1
(d) 1 2 4 5
87. In photosynthesis the light-independent reactions take place at
(a) thylakoid lumen
(b) photosystem I
(c) photosystem-ll
(d) stromal matrix
88. Anoxygenic photosynthesis is characteristic of
(a) Rhodospirillum
(b) Spirogyra
(c) Chtamydomonas
(d) Ulva
89. A process that makes important difference between C3 and C4-plants is
(a) transpiration
(b) glycolysis
(c) photosynthesis
(d) photorespiration
90. Of the total incident solar radiation, the proportion of PAR is
(a) about 60%
(b) less than 50%
(c) more than 80%
(d) about 70%
Answers