Biology Question Bank for Entrance Exams

For AIPMT Main other Medical Entrance Exam Prepration, Question Bank for Biology Photosynthesis is given below.

Green plants make their own food by photosynthesis. During this process carbon dioxide form the atmosphere is taken in by leaves through stomata and used for making carbohydrates, principally glucose and starch. Photosynthsis takes place only in the green parts of the plants, mainly the leaves. Within the leaves, the mesophyll cells have a large number of chloroplasts that are responsible for CO2 fixation. Within the chloroplasts, the membranes are sites for the light reaction, while the chemosynthetic pathway occurs in the stroma. photosynthesis has two stages the light reaction and the carbon fixing reations. in the light reaction the light energy is absorbed by the pigments present in the antenna and funnelled to special chlorophyll a molecules called reaction centre chlorophylls there are two photosystems, PS I and PS II. PS I has a 700 nm absorbing chlorophyll a P700 molecule at its reaction center, while PS II has a P680 reaction centre that absorbs red loght at 680 nm After absorbing light, electrons are excited and transferred through PS II and PS I and finally to NAD forming NADH. during this process a proton gradient due to movement through the thylakoid The breakdown of the protons gradient due to movement through the F0 part of the ATPase enzyme releases enough energy for synthesis of ATP splitting of water molecles is associated with PS II resulting in the release of 02, protons and transfer of electrons to PS II In the carbon fixation cyale, CO2 is added by the enzyme, RuBisCO, to a 5 carbon compound RuBP that is converted to 2 molecules of 3- carbon PGA. this is then converted to sugar by the Calvin cycle, and the RuBp is regenerated. During this process ATP and NADPH synthesised in the light reaction are utilsed RuBisCO also catalyses a wasteful oxygenation reaction in C3 plants: Photorespiration Some tropical plants show a special type of photosynthesis called C4 pathway in these plants the first product of CO2 fixation that takes place in the mesophyll, is a 4-carbon compound. in the bundle sheath cells the Calvin pathway is carried out for the synthesis of carbohydrates.

1. The name Melvin Calvin is associated with

(a) synthesis of ATP during photosynthesis

(b) release of water during photosynthesis

(c) carbon fixation during photosynthesis

(d) capture light energy during photosynthesis

2. Who gave chemical compositions of chlorophyll and carotenoids ?

(A) Park and Biggins (B) Meyers and French

(C) Willstatter and Stahi (D) Arnon and Benson

3. The non-polar part of chlorophyll is

(A) phytol (B) porphyrin (C) pyrrol (D) none above

4. The approximate dimension of chlorophyll porphyrin ring is.

(A) 1 Ao square (B) 5 Ao square (C) 10 Ao square (D) 15 Ao square

5. Photosynthesis is most active in

(A) sunlight (B) yellow (C) red (D) green

6. Intensity of light increase 20 times, rate of photosynthesis will

(A) increase (B) not increase

(C) decrease (D) increase till feed back inhibition.

7. Out of the total light energy that is available for plants is

(A) 50 % (B) 75 % (C) 25 % (D) 1––2%

8. One photon is blue light contains….kcal and of red light….kcal

(A) 70 ; 40 (B) 220 ; 70 (C) 10 ; 90 (D) 90 ; 10

9. The most efficient convertor of sunlight is

(A) Potato (B) Tomato (C) Sugar cane (D) Papaya

10. Cyclic photophosphorylation is confined to

(A) Photosystem I (B) Photosystem II

(C) both a & b (D) none above

AIPMT Question Bank: Biology -  Photosynthesis

14. The inhibiting effect of oxygen in C3 plants on photosynthesis is

(A) solarization (B) photooxidation

(C) Warbug’s effect (D) none above

15. Pick up C4 plant.

(A) Papaya (B) Potato (C) Maize (D) Pea

16. It is advantageous to use a water plant to demonstrate photosynthesis other than a land plant because.

(A) it photosynthesize rapidly (B) it respires slowly

(C) it does not transpire (D) O2 bubbles from cut and can be collected over H2O.

17. For chlorophyll formation most important are

(A) Fe++ and Ca++ (B) Fe++ and Mg++ (C) Mg++ and Ca++ (D) all the above

18. Translocation of sugar in angiosperms occur in form of

(A) glucose (B) starch (C) lactose (D) sucrose

19. Q10 is

(A) respiratory coefficients (B) photosynthetic coefficient

(C) photosynthetic yield (D) temperature coeffiecient

20. Photorespiration is favoured by

(A) low temperatures (B) low light intensity

(C) high O2 and low CO2 (D) low O2 and high CO2

21. Quinones are

(A) mobile electron carriers (B) enzymes of oxidative phosphorylation

(C) enzymes of krebs cycle (D) none of the above

22. During dark reaction, for the fixation of carbon, the three carbon atoms of each molecule of 3 – phosphogylceric acid (PGA) are derived from

(A) RuBP only (B) CO2 only

(C) RuBP + CO2 (D) RuBP + CO2 + PEP.

23. Calvin cycle utilize for fixation of 3 molecules of CO2

(A) 9 ATP and 6 NADPH2 (B) 8 ATP and 8 NADPH2

(C) 9 ATP and 3 NADPH2 (D) 6 ATP and 6 NADPH2

24. Chloroplast has maximum quantity of….in stroma

(A) dehydrogenase (B) RuBP carboxylase

(C) pyruvic carboxylase (D) hexokinase

25. If thylakoids are removed and kept in culture medium having CO2 and H2O and exposed to light ; they cannot form hexose sugars as end product because.

(A) light trapping device absent (B) pigments P-700 and P-680 not linked

(C) CO2 assimilating enzymes absent (D) CO2 assimilation cannot occur in light

26. Which of the following plant is efficient converter of solar energy whose net productivity 2-4 kg/m2/yr or even higher.

(A) Wheat (B) rice (C) sugarcane (D) bajra

27. The number of photons required to release one mole of O2 in photosynthesis called.

(A) quantum yield (B) quantum requirement

(C) red drop (D) Emerson’s effect

28. Calvin cycle represents one of the following phenomenon.

(A) oxidative carboxylation (B) dark phosphorylation

(C) dark respiration (D) reductive carboxylation

29. Hill reaction takes place

(A) in the absence of CO2

(B) in the presence of carbon dioxide

(C) in the absence of a suitable electron acceptor

(D) none above

30. 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) Steps of dark reaction of photosynthesis.

Q. J.W. Gibbas (ii) Photosynthetic phosphorylation

R. Danial Arnon (iii) Concept of free energy

S. Melvin Calvin (iv) Chemiosmotic hypothesis

(v) Mass flow hypothesis

(a) P = (iv), Q = (iii), R = (ii), S = (i)

(b) P = (iii), Q = (iv), R = (i), S = (i)

(c) P = (iv), Q = (v), R = (iii), S= (ii)

(d) P = (iv), Q = (iii), R = (i), S = (ii)

31. Match Column – I with given under Column – II ; choose the answer which gives correct combination:

Column – I(Scientists) Column – II(Contributions)

P. A pigment which absorbs red and far-red light (i) Cytochrome

Q. Main pigment involved in transfer of electrons in (ii) PEP carboxylase photosynthesis is

R. NADPH2 is generated through…. (iii) Photochrome

S. Enzyme which fixes CO2 in C4 plants (iv) Photosystems

(a) P = (i), Q = (ii), R = (iii), S = (iv)

(b) P = (iii), Q = (i), R = (iv), S = (iii)

(c) P = (iii), Q = (ii), R = (iii), S= (i)

(d) P = (i), Q = (ii), R = (iv), S = (iii)

32. The basic feature of typical C4 plants showing ‘Kranz’ anatomy is

(A) the presence of chloroplasts in mesophyll and epidermal cells

(B) the presence of chloroplasts in bundle sheath cells

(C) the presence of rudimentary chloroplasts in bundle sheath cells and typical chloroplasts with well-formed grana in mesophyll cells

(D) the presence of typical chloroplasts with well-formed grana in bundle sheath cells and rudimentary chloroplasts in the mesophyll cells

33. A. Six turns of Calvin-cycle result in the production of one molecule of glucose (C6H12O6)

R. Three molecules of ribulose 1, 5 – bisphosphate (Ru BP) react with three molecules of carbon dioxide to produce six carbon intermediates.

(A) A is correct and R is its explanation (B) A is correct but R is not its explanation

(C) A is correct but R is wrong (D) Both A and R are wrong

34. Maximum photosynthesis occurs in which of these lights ?

(A) Red (B) Green

(C) Very high light (D) Continuous bright light

35. In C4 plants showing Kranz anatomy which of the following is correct ?

(A) Bundle sheath cells without grana and mesophyll cells with grana

(B) bundle sheath cells with grana mesophyll cells without grana

(C) both are without grana

(D) both are with grana

36. In Blackmann’s ‘Law of Limiting Factors’ the rate of photosynthesis continues to increase with the successive increase in the amounts of

(A) carbon dioxide, light, temperature (B) temperature, light, carbon dioxide

(C) light, temperature, carbon dioxide (D) light, carbon dioxide, temperature

37. Choose the correct statement

AIPMT Question Bank: Biology -  Photosynthesis

38. Chlorophyll a is absent in which of the following photosynthesising organisms ?

(A) Bacteria (B) Cyanobacteria (C) Red algae (D) Brown algae

39. Photorespiration in C3 plants starts from.

(A) phosphoglycerate (B) phosphosglycolate (C) glycerate (D) glycine

40. Which one of the following is wrong in relation to photorespiration ? It

(A) occurs in chloroplasts (B) occurs in daytime only

(C) is a characteristic of C4 plants (D) is a characteristic of C3 plants

41. In sugarcane plant CO2 is fixed in malic acid, in which the enzyme that fixes CO2 is

(A) ribulose biphosphate carboxylase (B) phosphoenol pyruvic acid carboxylase

(C) ribolose phosphate kinase (D) fructose phosphatase

42. Plants are removed from patients room at night because

(A) they produce CO2 at night in more concentration

(B) they produce CO2 all the time but release O2 also in day time

(C) they consume O2 at night.

(D) they do not photosynthesize at night, therefore fail to deplete CO2 of the room, hence their presence will increase CO2

43. Who is that scientist who gave the Law of limiting factors ?

(A) Blackman (B) Hill (C) Liebig (D) Von Mohi

44. Which of the following is correct for chlorophyll of cyanobacteria ?

AIPMT Question Bank: Biology -  Photosynthesis

45. How many electrons are involved for the formation of 1 mole of glucose and 6O2 molecules ?

(A) 6 (B) 12 (C) 18 (D) 24

46. 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.

(A) If A is correct and R is its explanation (B) If A is correct but R is not its explanation

(C) If A is correct but R is wrong (D) If both A and R are correct

47. 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) Decarboxylation of C4 acids occurs in the mesophyll cells.

(D) In CAM plants Calvin’s cycle reactions occur during night.

48. 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

(A) P = (iv) Q = (i) R = (iii) S = (ii)

(B) P = (i) Q = (iv) R = (ii) S = (iii)

(C) P = (ii) Q = (i) R = (iii) S = (iv)

(D) P = (iv) Q = (iii) R = (ii) S = (i)

49. 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

(A) P = (i) Q = (ii) R = (iii) S = (iv) T = (v)

(B) P = (iii) Q = (v) R = (i) S = (ii) T = (iv)

(C) P = (i) Q = (iii) R = (v) S = (iv) T = (i)

(D) P = (i) Q = (iii) R = (iv) S = (ii) T = (v)

50. During photosynthessis, plants

(A) absorb O2, release CO2 (B) release O2, absorb CO2

(C) absorb N2, release O2 (D) absorb N2 and release NH3

51. A plant with low CO2 compensation point is

(A) Atriplex patula (B) Leucopoa kingii

(C) Gossypium hisrsutum (D) Tidestromia oblingifolia

52. Rubisco is an enzyme for

(A) CO2 fixation in dark reaction (B) photorespiration

(C) regeneration of RuBP (D) photolysis of water

53. Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because :

(A) Four carbon acids are the primary initial CO2 fixation production.

(B) The primary fixation of CO2 is mediated via PEP carboxalase.

(C) Effective pumping of CO2 into bundlesheath cells.

(D) Rubisco in C4 plants has higher affinity for CO2.

54. Stomata of CAM plants

(A) are always open

(B) open during the day and close at right.

(C) open during the night and close during the day.

(D) never open

55. 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

(A) 3-1-2 (B) 3-2-1 (C) 1-2-3 (D) 2-1-3

56. 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.

(A) If Assertion (A) and reason (R) both are correct and R is explanation to A.

(B) If (A) and (R) both are correct but (R) is not an explanation to A.

(C) If A is true but R is false.

(D) If both A and R are false.

57. A. Photosynthestically C4 plants are less efficient then C3 plants.

R. The operaion of C4 pathway requires the involvement of only bundle-sheath cells.

(A) If Assertion (A) and reason (R) both are correct and R is explanation to A.

(B) If (A) and (R) both are correct but (R) is not an explanation to A.

(C) If A is true but R is false.

(D) If both A and R are false.

58. One of the following is electron donor to P680 during light reactions of photosynthesis.

(A) NADPH (B) Phytochrome

(C) Chiorophyll (D) Water

59. The requirement of assimilatory power to fix 6 molecules of CO2 is

(A) 6 ATP, 6 NADPH (B) 12 ATP, 18 NADPH

(C) 18 ATP, 18 NADPH (D) 18 ATP, 12 NADPH

60. Photorespiration and photosynthesis both require

(A) Organic fuel (B) chlorophyll (C) cytochromes (D) energy

61. The chemical structure of chlorophyll ‘a’ varies from chlorophyll ‘b’ due to difference between.

(A) CH3 and C2H5 (B) CH3 and CH2 = CH2

(C) CH3 and CHO (D) CHO and CH2 = CH2

62. Choose the correct combinations of labelling the carbohydrate molecule involved in the Calvin cycle.

AIPMT Question Bank: Biology -  Photosynthesis

63. Chlorophyll molecules absorb light energy of wavelength

(A) 300-400 nm (B) 400-500 nm

(C) 600-800 nm (D) 400-500 nm and 600-700 nm

64. The reduction of ADP to ATP occurs by

(A) oxidation of water

(B) high conc. of H+ ions across the membrane

(C) oxidation of NADPH

(D) release of electron from PS-II to PS-I

65. The process of ATP formation from ADP in the presence of light in chloroplast is called

(A) phosphorylation

(B) autophosphorylation

(C) photophosphorylation

(D) chemophosphorylation

66. 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 2 protons (D) 2 electrons and 2 protons

67. The enzyme pair common to C3 plants and EMP is

(A) cytochrome oxidase and enolase

(B) aldolase and triose phosphate isomerase

(C) aldolase and enolase

(D) phosphoglyceromutase and triose phosphate isomerase

68. Non-cycle photosphorylation is the main photochemical reaction in green plants because

(A) it produces assimilatory power and oxygen

(B) it initiates photolysis of water of productions of oxygen

(C) it utilizes more energy for oxygen production.

(D) there is no other cycle available.

69. ………………. is the by product of photosynthesis.

(A) O2 (B) H2O (C) CO2 (D) C6H12O6

70. Site of reduction of carbon is

(A) lamellae (B) thylakoid (C) grana (D) stroma

71. In C4 plants, the primary CO2 acceptor is

(A) 3 – PGA (B) Oxalo acetic acid (C) RuBP (D) PEP

72. It is estimated that about 85% of the earth’s photosynthetic activity is carried out by

(A) trees (B) savannas

(C) phytoplanktons (D) herbaceous plants

73. 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 ?

(A) Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate.

(B) Amount of oxygen evolved increases as the avilability of carbon dioxide increases

(C) Amount of oxygen evolved decreases as the avilability of carbon dioxide increases

(D) Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate

74. 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

75. In chlorophyll structure four pyrole rings are united with Mg by their atoms of

(A) N (B) C (C) H (D) O

76. The fixation and reduction of CO2 occur in preence of


(C) NADPH, chlorophyll and water (D) ATP, NADPH and light

77. Sugar moves in phloem vessels as ______.

(a) cellulose (b) glucose (c) starch (d) sucrose

78. ____ ions help in photolysis of water.

(a) Mn++ (b) Mg++ (c) Cl- (d) both (a) and (c)

79. RUBISCO enzyme is also called as ______.

(a) carboxy tetra mutase (b) carboxy di mutase

(c) carboxy tri mutase (d) carboxy uni mutase

80. ______ is precursor for abscissic acid (ABA)

(a) Zeatin (b) Lutein (c) Violaxanthin (d) Mevalonic acid

81. In young leaves ratio of carotene to Xanthophyll is ____.

(a) 2 : 1 (b) 3: 1 (c) 1: 3 (d) 1: 2

82. Which of the following pigments contains open pyrolle ring?

(a) Phycobilins (b) Xanthophylls (c) Chlorophylls (d)  -carotene

83. In which of the following light, rate of photosynthesis is maximum?

(a) white (b) discontinuous white (c) red (d) blue

84. Quantum yield of photosynthesis is ______.

(a) 13.5 % (b) 8 % (c) 13% (d) 12.5%

85. During light phase of photosynthesis ______ is oxidized and ______ is reduced.

(a) CO2 and Water (b) Water and CO2

(c) Water and NADP (d) NADPH2 and CO2

86. During dark phase of photosynthesis ______ is oxidized and ______ is reduced

(a) CO2 and Water (b) Water and CO2

(c) Water and NADP (d) NADPH2 and CO2

87. The visible product of photosynthesis is ______.

(a) glucose (b) cellulose (c) starch (d) fructose

88. To produce 3 glucose molecules ______ ATP and ______ NADPH2 molecules are required.

(a) 54, 36 (b) 54, 30 (c) 36, 60 (d) 18, 12

89. Glycolytic reversal is a part of ______.

(a) aerobic respiration (b) anaerobic respiration

(c) light phase of photosynthesis (d) dark phase of photosynthesis

90. RuBp carboxylase acts as RuBp carboxygenase at ______ CO2 conc. And ______ O2 conc.

(a) low, low (b) low, high(c) high, high (d) high, low

91. The source of CO2 during calvin cycle in C4 plant is

(a) Malic acid (b) OAA (c) PEP (d) RuBP

92. Dicot which follow C4 pathway is____.

(a) wheat (b) Amranthus (c) Maize (d) Mango

93. Absorption spectrum of chlorophyll is maximum in _____ light.

(a) red (b) blue (c) yellow (d) blue-violet

94. The oxygen molecule in glucose formed during photosynthesis comes from

(a) Water (b) Organic acids (c) CO2 (d) atmosphere

95. Dimorphic chloroplast are present in ______.

(a) zea mays (b) sacchrum officinale (c) sorghum bicolor (d) all of these

96. Red pigment in tomato is
(a) AIPMT Question Bank: Biology -  Photosynthesis -carotene (b) Anthocyanin (c) Lycopene (d) Lutein

97. Solarisation refers to ______.

(a) formation of sugar with help of water and energy (b) destruction of chlorophyll

(c) synthesis of chl. (d) both b and c

98. Dark reaction requires light reaction for

(a) carboxylation of RUBP (b) regeneration of RuBP

(c) reduction of PGA (d) formation of hexose sugar

99. Emerson effect proves

(a) concept of two photosystem in plant (b) photophosphorylation

(c) photorespiration (d) there are light and dark reaction in photosynthesis

100. Name a plant which do not perform photosynthesis is

(a) Algae (b) Bryophyllum (c) cuscutta (d)Pitcher plant

101. Light reaction of photosynthesis results in formation of ______.

(a) O2 (b) NADPH + H+ (c) ATP (d) All of these

102. C55H70O6N4 Mg is

(A) An accessory pigment in photosynthesis (B) Present in PS-II

(C) Present in all green plants (D) All of these

103. The ionized chl.a+

(A) Receives low energy electron (B) Receives high energy electron

(C) Expels low energy electron (D) Expels high energy electron

104. In Calvin cycle,

(A) fructose 1,6 diphophate undergoes dephosphorylation.

(B) ATP is formed during dephosphoylation of fructose

(C) 1,3 di PGA undergo phosphorylation

(D) none of these

105. What will happen to the rate of photosynthesis if sodium bicarbonate is added in the water having hydrilla plant in a beaker

(A) It will remain normal (B) It will be decreased

(C) It will be stopped (D) It will be accelerated

106. Which of the following gas would disappear from the atmosphere if all the photosynthetic activities were to stop?

(A) Nitrogen (B) Carbondioxide

(C) Hydrogen (D) Oxygen

107. Photo-oxidation of chlorophyll and cell contents as a result of high light intensity is known as

(A) Solarization (B) Photolysis

(C) Photperiodism (D) Photorespiration

108. Temperature is very high but a plant is showing photosynthesis with normal rate, probably it would be

(A) C3 plant (B) Mango plant (C) Pea plant (D) Sugarcane plant

109. For the process of photosynthesis all except one of the following items are essential. Point out the exception

(A) CO2, optimum temperature (B) Glucose and oxygen

(C) Water and minerals (D) Light and chlorophyll

110. The prerequisities of Calvins cycle are

(A) H2O, CO2, ATP (B) ATP, H2O, NADPH2


111. In the calvin cycle, the assimilatory power is used during

(A) Formation of PGA

(B) Conversion of PGA to PGAL

(C) Formation of fructose 1-6 diphsophate from PGAL

(D) Formation of glucose from fructose – di- phosphate

112. Which is sensitive to longer wavelength of light?

(A) Photolysis (B) PSI (C) PS II (D) Photophosphorylation

113. In chrophyll structure Phytol tail is present at

(A) 3rd carbon of IInd ring (B) 2nd carbon of IIIrd ring

(C) 7th carbon of IVth ring (D) 3rd carbon of IVth ring

114. Reduction of co-enzyme NADP depends on

(A) Reduction of CO2 (B) Evolution of O2

(C) Photolysis of water (D) Formation of ATP

115. Loculus is the internal space of

(A) Grana (B) Stroma (C) Thylakoid (D) Quantasome

116. Calvins cycle involves

(A) Oxidative phosphorylation (B) Oxidative carboxylation

(C) Reductive carboxylation (D) Reductive phophorylation

117. In C4 plants, carboxylation is twice, it can be represented as

(A) Pyruvic acid + CO2 and malic acid + CO2

(B) RuBP + CO2 and pyruvic acid + CO2

(C) PEPA + CO2 and RuBP + CO2

(D) PEPA + CO2 and malic acid + CO2

118. In non-cyclic photophosphorylation, all the participants acts as electron donor and acceptor except

(A) Chl-a of PS I (B) Chl-a of PS II (C) NADP (D) Both (A) and (B)

119. Ribbon shaped chloroplast is present in

(A) Zygnema (B) Spirogyra

(C) Chlorobium (D) Chromatinum

120. Which of the following protist is a photoautotroph

(A) Thiobacillus (B) Ferrobacillus

(C) Diatoms (D) Chlorobium

121. Photosynthesis takes place

(A) Only in green light (B) Only in sunlight

(C) In visible light obtained from any source (D) Only in high intensity of light

122. Chlorophyll-a differes from chlorophyll-b in having—

(A) Methly group instead of aldehyde group

(B) Aldehyde group instead of methyl group

(C) Methyl group instead of ethyl group

(D) Only phytol tail instead of head

123. In non-cyclic photophosphorylation

(A) ATP is generated

(B) Both PSI and PSII are involved

(C) Electron flow is unidirectional

(D) All the above

124. In con-cyclic photophosphorylation, the electron emitted by P680 is replaced by electron from

(A) NADP (B) Water (C) Ferridoxin (D) Chlorophyll-a

125. 85-90% (9/10) of all photosynthesis in the world is carried out by

(A) Shrubs (B) Algae of the oceans

(C) Herbs (D) Scientists in the laboratory

126. Primary and secondary processes of Photosynthesis takes place in ______ and ______ respectively.

(A) Stroma and grana (B) Stroma and lamellae

(C) Thylakoid and quantasome (D) Grana and stroma

127. Which one occurs during both cyclic and non-cyclic photophosphorylation

(A) Formation of ATP (B) Release of O2

(C) Formation of NADPH2 (D) Involvement of both PSI and PSII

128. The photochemical process in photosynthesis which needs both PSI and PSII also involves

(A) Photolysis of water (B) Z-scheme of electron transfer

(C) Synthesis of assimilatory power (D) All of these

129. For synthesis of one molecule of glucose, the requirement of ATP and NADPH2 is respectively

(A) 15 and 10 (B) 12 and 8

(C) 30 and 15 (D) 18 and 12

130. Which of the following element is needed for chlorophyll biosynthesis?

(A) Copper (B) Magnesium

(C) Calcium (D) Chlorine

131. The two enzymes responsible for primary carboxylation in C3 and C4 pathway, respectively are

(A) RuBP carboxylase and RuBP oxygenase

(B) PEP carboxylase and RuBP carboxylase

(C) RuBP carboxylase and PEP carboxylase

(D) PEP carboxylase and pyruvate carboxylase

132. _______ are placed one above the other to form stack of coins

(A) oxysomes (B) F1 particles (C) cristae (D) thylakoids

133. Unidirectional flow of e- in non-cyclic photophosphorylation is

AIPMT Question Bank: Biology -  Photosynthesis

134. The head and tail of chlorophyll are made up of

(A) Pyrrole and tetrapyrrole (B) Porphyrine and phyrin

(C) Pophyrine and phytol (D) Tetrapyrrole and magnesium

135. The numbner of photons needed for the evolution of one molecule of oxygen is

(A) 8 (B) 2 (C) 12 (D) 18

136. Action spectrum is

(A) A graph showing amount of light absorbed

(B) A graph showing rate of photosynthesis

(C) A graph showing absorption of light

(D) A graph showing amount of CO2 released

137. C40H56O2 is molecular formula of

(A) Xanthophyll (B) Carotenes

(C) Chlorophylls (D) Phycobillins

138. Quantasome contains

(A) 150-200 chlorophyll molecules (B) 200 chlorophyll molecules

(C) 230-250 chlorophyll molecules (D) 300-350 chlorophyll molecules

139. Erythrose monophosphate (4C) is formed during

(A) CAM pathway (B) C4 pathway

(C) Conversion of fructose to glucose (D) Regeneration of RuBP

140. Donor and acceptor of electrons is the same chlorophyll molecule in

(A) Cyclic phtophosphorylation (B) Photorespiration

(C) Substrate level phosphorylation (D) Non-cyclic photophosphorylation

141. If a photosynthsing plant releases O18, it is concluded that the plant has been supplied with

(A) Water containing O18 (B) Oxygen in the form of ozone

(C) Sugar containing O18 (D) Carbon dioxide containing O18

142. Which of the following connet the primary and secondary processes of photosynthesis?


(C) ATP (D) Ferridoxins

143. C4 plants can perform photosynthesis

(A) Even in low light intensity

(B) Even in low CO2 concentration

(C) Both (A) and (B)

(D) Only in high intensity of light and high CO2

144. In Hill’s experiment, Hill used ______ as oxygen acceptor,

(A) Hydrogen (B) FAD (C) NADP (D) Haemoglobin

145. Fret channel is a another name for

(A) Stroma lamellae (B) Intergranal lamellae

(C) Grana lamellae (D) Space present in stroma lamellae

146. Bundle sheath chloroplast of C4 plants are

(A) Large and agranal (B) Large and granal

(C) Small and granal (D) Small and agranal

147. In C3 pathway, out of 12 molecules of 3-PGAL, how many are used for regeneration of RuBP?

(A) 12 (B) 8 (C) 10 (D) 6

148. A plant is kept in 300 ppm CO2 concentration. What will happen to it

(a) Plant will die soon

(b) Plant will grow but will not die

(c) Plant will show normal photosynthesis

(d) Respiration will be greatly decreased

149. All plastids have essentially same structure because

(a) They have to perform same function

(b) They are localized in aerial parts of plants

(c) All plastids store starch, lipid and proteins

(d) One type of plastid can be differentiated into another type of plastid depending on cell requirements

150 Give the correct name of indicated part A and B (CHART)

(A) A- cytocrome-a & a3 B -Thylakoid

(B) A- Thylakoid B-cytocrome-a & a3

(C) A- cytocrome-b& f B-Thylakoid

(D) A- cytopalsm B-Thylakoid

AIPMT Question Bank: Biology -  Photosynthesis

151 which process is indicated by the given chart? Ple see fig. (QUE:150)

(A)Synthesis of ATP by chemiosmosis

(B) Synthesis of food by chemiosmosis

(C)hydrolysis of water by chemiosmosis

(D)transfer of electron by chemiosmosis

AIPMT Question Bank: Biology -  Photosynthesis

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