NCERT CLASS 11 | TOPIC : PLANT PHYSIOLOGY-PHOTOSYNTHESIS | PYQB (LATEST) | NEET BIOLOGY ONLINE TEST

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NCERT CLASS 11 | TOPIC : PLANT PHYSIOLOGY-PHOTOSYNTHESIS | PYQB (LATEST) | NEET BIOLOGY ONLINE TEST

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It contains 99 important questions. Choose the most correct answer. Then check your answer. Try again if there are errors. Regards : www.onlinetest.kalvisolai.com

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1 ➤ 1. One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of (Odisha NEET 2019)

(a) violet and green light (b) indigo and green light (c) orange and yellow light (d) blue and red light.

2 ➤ 2. Oxygen is not produced during photosynthesis by (2018)

(a) Green sulphur bacteria (b) Nostoc (c) Cycas (d) Chara.

3 ➤ 3. Anoxygenic photosynthesis is characteristic of (2014)

(a) Rhodospirillum (b) Spirogyra (c) Chlamydomonas (d) Ulva.

4 ➤ 4. Oxygenic photosynthesis occurs in (2009)

(a) Oscillatoria (b) Rhodospirillum (c) Chlorobium (d) Chromatium.

5 ➤ 5. Stroma in the chloroplasts of higher plant contains (2009)

(a) light-dependent reaction enzymes (b) ribosomes (c) chlorophyll (d) light-independent reaction enzymes.

6 ➤ 6. Emerson's enhancement effect and Red drop have been instrumental in the discovery of (NEET-I 2016)

(a) photophosphorylation and cyclic electron transport (b) oxidative phosphorylation (c) photophosphorylation and non-cyclic electron transport (d) two photosystems operating simultaneously.

7 ➤ 7. Chromatophores take part in (2015)

(a) movement (b) respiratic (c) photosynthesis (d) growth.

8 ➤ 8. Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants? (2003)

(a) Blue and green (b) Green and red (c) Red and violet (d) Violet and blue

9 ➤ 9. Which element is located at the centre of the porphyrin ring in chlorophyll? (2003)

(a) Calcium (b) Magnesium (c) Potassium (d) Manganese

10 ➤ 10. Chlorophyll a molecule at its carbon atom 3 of the pyrrole ring II has one of the following (1997)

(a) carboxylic group (b) magnesium (c) aldehyde group (d) methyl group.

11 ➤ 11. The core metal of chlorophyll is (1997)

(a) Ni (b) Cu (c) Fe (d) Mg

12 ➤ 12. Chlorophyll a occurs in (1992)

(a) all photosynthetic autotrophs (b) in all higher plants (c) all oxygen liberating autotrophs (d) all plants except fungi.

13 ➤ 13. Photosynthetic pigments found in the chloroplasts occur in (1991)

(a) thylakoid membranes (b) plastoglobules (c) matrix (d) chloroplast envelope.

14 ➤ 14. The size of chlorophyll molecule is (1989)

(a) head 15 x 15 Å, tail 25 Å (b) head 20 x 20 Å, tail 25 Å (c) head 15 x 15 Å, tail 20 Å (d) head 10 x 12 Å, tail 25 Å.

15 ➤ 15. The reaction centre in PS II has an absorption maxima at (2023)

(a) 660 nm (b) 780 nm (c) 680 nm (d) 700 nm.

16 ➤ 16. Which of the following is not a product of light reaction of photosynthesis? (2018)

(a) ATP (b) NADH (c) NADPH (d) Oxygen

17 ➤ 17. Which of the following absorb light energy for photosynthesis? (2002)

(a) Chlorophyll (b) Water molecule (c) O2 (d) RuBP

18 ➤ 18. The first step for initiation of photosynthesis will be (2000)

(a) photolysis of water (b) excitement of chlorophyll molecules due to absorption of light (c) ATP formation (d) glucose formation.

19 ➤ 19. NADPH2 is generated through (1997)

(a) photosystem II (b) anaerobic respiration (c) glycolysis (d) photosystem I.

20 ➤ 20. Which of the following pigments acts as a reaction- centre during photosynthesis? (1994)

(a) Carotene (b) Phytochrome (c) P700 (d) Cytochrome

21 ➤ 21. Ferredoxin is a constituent of (1991)

(a) PSI (b) PS II (c) Hill reaction (d) P680-

22 ➤ 22. Which of the following combinations is required for chemiosmosis? (2023)

(a) Proton pump, electron gradient, ATP synthase (b) Proton pump, electron gradient, NADP synthase (c) Membrane, proton pump, proton gradient, ATP synthase (d) Membrane, proton pump, proton gradient, NADP synthase

23 ➤ 23. Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves

(a) breakdown of proton gradient (b) breakdown of electron gradient (c) movement of protons across the membrane to the stroma (d) reduction of NADP to NADPH, on the stroma side of the membrane. (2022)

24 ➤ 24. In light reaction, plastoquinone facilitates the transfer of electrons from (2020)

(a) PS-II to Cytb6f complex (b) Cytbof complex to PS-I (c) PS-I to NADP+ (d) PS-I to ATP synthase.

25 ➤ 25. In a chloroplast the highest number of protons are found in (NEET-I 2016)

(a) intermembrane space (b) antennae complex (c) stroma (d) lumen of thylakoids.

26 ➤ 26. Read the following four statements (A - D).

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(A) Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.

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(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.

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(C) Stamens in flowers of Gloriosa and Petunia are polyandrous.

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(D) Symbiotic nitrogen fixers occur in free-living state also in soil.

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How many of the above statements are right? (Mains 2012)

(a) Two (b) Three (c) Four (d) One

27 ➤ 27. Which one of the following is essential for photolysis of water? (Mains 2011)

(a) Manganese (b) Zinc (c) Copper (d) Boron

28 ➤ 28. Read the following four statements, (i), (ii), (iii) and (iv) and select the right option having both correct statements.:

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Statements:

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(i) Z scheme of light reaction takes place in presence of PSI only. :

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(ii) Only PSI is photophosphorylation. functional in cyclic:

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(iii) Cyclic photophosphorylation results into synthesis of ATP and NADPH2.:

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(iv) Stroma lamellae lack PSII as well as NADP. (Mains 2010)

(a) (ii) and (iv) (b) (i) and (ii) (c) (ii) and (iii) (d) (iii) and (iv)

29 ➤ 29. Cyclic photophosphorylation results in the formation of (2009)

(a) ATP and NADPH (b) ATP, NADPH and O₂ (c) ATP (d) NADPH.

30 ➤ 30. Electrons from excited chlorophyll molecule of photosystem II are accepted first by (2008)

(a) quinone (b) ferredoxin (c) cytochrome-b (d) cytochrome-f.

31 ➤ 31. The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is (2007)

(a) iron-sulphur protein (b) ferredoxin (c) quinone (d) cytochrome.

32 ➤ 32. In photosystem I, the first electron acceptor is (2006)

(a) an iron-sulphur protein (b) ferredoxin (c) cytochrome (d) plastocyanin.

33 ➤ 33. Which one of the following concerns photophosphorylation? (2003)

(a) ADP+AMP Light energy > ATP (b) ADP+ Inorganic PO4 ---> ATP (c) ADP Inorganic PO4 Light energy > ATP (d) AMP+ Inorganic PO4 Light energy > ATP

34 ➤ 34. In photosynthesis energy from light reaction to dark reaction is transferred in the form of (2002)

(a) ADP (b) ATP (c) RuDP (d) chlorophyll.

35 ➤ 35. Which pigment system is inactivated in red drop? (2001)

(a) PS-I and PS-II (b) PS-1 (c) PS-II (d) None of these

36 ➤ 36. During light reaction of photosynthesis, which of the following phenomenon is observed during cyclic phosphorylation as well as non-cyclic phosphorylation? (1994)

(a) Release of O₂ (b) Formation of ATP (c) Formation of NADPH (d) Involvement of PS 1 and PS II pigment systems

37 ➤ 37. A photosynthesising plant is releasing "O more than the normal. The plant must have been supplied with (1993)

(a) O3 (b) H₂O with ¹⁸O (c) CO₂ with ¹⁸O (d) C₆H₁₂O₆ with ¹⁸O

38 ➤ 38. Photosystem II occurs in (1992)

(a) stroma (b) cytochrome (c) grana (d) mitochondrial surface.

39 ➤ 39. NADP+ is reduced to NADPH in (1988)

(a) PS1 (b) PS II (c) Calvin cycle (d) noncyclic photophosphorylation.

40 ➤ 40. How many ATP and NADPH2 are required for the synthesis of one molecule of glucose during Calvin cycle? (2023)

(a) 12 ATP and 16 NADPH₂ (b) 18 ATP and 16 NADPH₂ (c) 12 ATP and 12 NADPH₂ (d) 18 ATP and 12 NADPH₂

41 ➤ 41. Which of the following statements is incorrect? (2021)

(a) Cyclic photophosphorylation involves both PSI and PS II. (b) Both ATP and NADPH+H are synthesised during non-cyclic photophosphorylation. (c) Stroma lamellae have PS I only and lack NADP reductase. (d) Grana lamellae have both PSI and PS II.

42 ➤ 42. In photosynthesis, the light-independent reactions take place at (2015)

(a) photosystem II (b) stromal matrix (c) thylakoid lumen (d) photosystem 1.

43 ➤ 43. Which one of the following organisms is correctly matched with its three characteristics?

(a) Pea: C3 pathway, endospermic seed, vexillary aestivation (b) Tomato: twisted aestivation, axile placentation, berry (c) Onion: bulb, imbricate aestivation, axile placentation (d) Maize: C3 pathway, closed vascular bundles, scutellum (Mains 2012)

44 ➤ 44. PGA as the first CO, fixation product was discovered in photosynthesis of (2010)

(a) bryophyte (b) gymnosperm (c) angiosperm (d) alga.

45 ➤ 45 . The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because (2008)

(a) a proton gradient forms across the inner membrane (b) there is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP) (c) high energy bonds are formed in mitochondrial proteins (d) ADP is pumped out of the matrix into the intermembrane space.

46 ➤ 46. Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on (2005)

(a) membrane potential (b) accumulation of Na+ ions (c) accumulation of K+ ions (d) proton gradient.

47 ➤ 47. In C3 plants, the first stable during the dark reaction is product of photosynthesis (2004)

(a) malic acid (b) oxaloacetic acid (c) 3-phosphoglyceric acid (d) phosphoglyceraldehyde.

48 ➤ 48. For assimilation of one CO, molecule, the energy required in form of ATP and NADPH₂ are (2000)

(a) 2 ATP and 2 NADPH₂ (b) 5 ATP and 3 NADPH₂ (c) 3 ATP and 2NADPH₂ (d) 18 ATP and 12 NADPH₂

49 ➤ 49. For the synthesis of one glucose molecule the Calvin cycle operates for (2000)

(a) 2 times (b) 4 times (c) 6 times (d) 8 times.

50 ➤ 50. Carbon dioxide acceptor in C₂-plants is (1999)

(a) PGA (b) PEP (c) RuDP (d) none of these.

51 ➤ 51. The mechanism of ATP formation both in chloroplast and mitochondria is explained by (1997)

(a) chemiosmotic theory (b) Munch's hypothesis (mass flow model) (c) relay pump theory of Godlewski (d) Cholodny-Went's model.

52 ➤ 52. What will be the number of Calvin cycles to generate one molecule of hexose? (1996)

(a) 8 (b) 9 (c) 4 (d) 6

53 ➤ 53. The primary acceptor, during CO, fixation in C3 plants, is (1995)

(a) phosphoenolpyruvate (PEP) (b) ribulose 1, 5-diphosphate (RuDP) (c) phosphoglyceric acid (PGA) (d) ribulose monophosphate (RMP).

54 ➤ 54. The carbon dioxide acceptor in Calvin cycle/ C3-plants is (1993)

(a) phosphoenol pyruvate (PEP) (b) ribulose 1, 5-diphosphate (RuDP) (c) phosphoglyceric acid (PGA) (d) ribulose monophosphate (RMP).

55 ➤ 55. Which technique has helped in investigation of Calvin cycle? (1991)

(a) X-ray crystallography (b) X-ray technique (c) Radioactive isotope technique (d) Intermittent light

56 ➤ 56. Dark reactions of photosynthesis occur in (1991)

(a) granal thylakoid membranes (b) stromal lamella membranes (c) stroma outside photosynthetic lamellae (d) periplastidial space.

57 ➤ 57. Carbon dioxide joins the photosynthetic pathway in

(a) PSI (b) PS II (c) light reaction (d) dark reaction.

58 ➤ 58. Given below are two statements:

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Statement I: The primary CO2 acceptor in C4 plants is phosphoenol pyruvate and is found in the mesophyll cells.

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Statement II: Mesophyll cells of C4 plants lack RuBisCO enzyme. In the light of the above statements, choose the correct answer from the options given below: (2022)

(a) Both statement I and statement II are correct. (b) Both statement I and statement II are incorrect. (c) Statement I is correct but statement II is incorrect. (d) Statement I is incorrect but statement II is correct.

59 ➤ 59. What is the role of large bundle sheath cells found around the vascular bundles in C4 plants? (2022)

(a) To provide the site for photorespiratory pathway (b) To increase the number of chloroplast for the operation of Calvin cycle (c) To enable the plant to tolerate high temperature (d) To protect the vascular tissue from high light intensity

60 ➤ 60. The first stable product of CO₂ fixation in sorghum is (2021)

(a) phosphoglyceric acid (b) pyruvic acid (c) oxaloacetic acid (d) succinic acid.

61 ➤ 61. Phosphoenol pyruvate (PEP) is the primary CO₂ acceptor in (2017)

(a) C4 plants (b) C2 plants (c) C3 and C4 plants (d) C3 plants.

62 ➤ 62. A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant? (NEET-I 2016)

(a) CAM (b) Nitrogen fixer (c) C3 (d) C4

63 ➤ 63. Bundle sheath cells Karnataka (NEET 2013)

(a) are rich in PEP carboxylase (b) lack RuBisCO (c) lack both RuBisCO and PEP carboxylase (d) are rich in RuBisCO.

64 ➤ 64. CAM helps the plants in (2011)

(a) conserving water (b) secondary growth (c) disease resistance (d) reproduction.

65 ➤ 65. In kranz anatomy, the bundle sheath cells have (Mains 2011)

(a) thin walls, many intercellular spaces and no chloroplasts (b) thick walls, no intercellular spaces and large number of chloroplasts (c) thin walls, no intercellular spaces and several chloroplasts (d) thick walls, many intercellular spaces and few chloroplasts.

66 ➤ 66. Study the pathway given below: [AIPMT MAINS 2010]

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In which of the following options, correct words for all the three blanks A, B and C are indicated?

(a) A: Decarboxylation, B: Reduction, C: Regeneration (b) A: Fixation, B: Transamination, C: Regeneration (c) A: Fixation, B: Decarboxylation, C: Regeneration (d) A: Carboxylation, B: Decarboxylation, C: Reduction

67 ➤ 67. Kranz anatomy is one of the characteristics of the leaves of (Mains 2010)

(a) potato (b) wheat (c) sugarcane (d) mustard.

68 ➤ 68. The C4 plants are photosynthetically more efficient than C3 plants because (2008)

(a) the CO₂ efflux is not prevented (b) they have more chloroplasts (c) the CO₂ compensation point is more (d) CO₂ generated during photorespiration is trapped and recycled through PEP carboxylase.

69 ➤ 69. In leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in (2008)

(a) bundle sheath (b) guard cells (c) epidermal cells (d) mesophyll cells.

70 ➤ 70. In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of (2007)

(a) bundle sheath (b) phloem (c) epidermis (d) mesophyll.

71 ➤ 71. As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C₁-plants? (2005)

(a) Two (b) Six (c) Twelve (d) Zero

72 ➤ 72. Photosynthesis in C4 plants is relatively less limited by atmospheric CO₂ levels because (2005)

(a) effective pumping of CO₂ into bundle sheath cells (b) RuBisCO in C4 plants has higher affinity for CO2 (c) four carbon acids are the primary initial CO2 fixation products (d) the primary fixation of CO₂ is mediated via PEP carboxylase.

73 ➤ 73. In sugarcane plant 14CO₂ is fixed to malic acid, in which the enzyme that fixes CO₂ is (2003)

(a) ribulose biphosphate carboxylase (b) phosphoenol pyruvic acid carboxylase (c) ribulose phosphate kinase (d) fructose phosphatase.

74 ➤ 74. Stomata of CAM plants (2003)

(a) are always open (b) open during the day and close at night (c) open during the night and close during the day (d) never open.

75 ➤ 75. Which pair is wrong? (2001)

(a) C3-maize (b) C4-kranz anatomy (c) Calvin cycle-PGA (d) Hatch and Slack cycle - OAA

76 ➤ 76 . Which is the first CO₂ acceptor enzyme in C, plants? 2000

(a) RuDP carboxylase (b) Phosphoric acid (c) RuBisCO (d) PEP- carboxylase

77 ➤ 77. In C4 plants, CO₂ combines with (1996)

(a) phosphoenol pyruvate (b) phosphoglyceraldehyde (c) phosphoglyceric acid (d) ribulose diphosphate.

78 ➤ 78. in C4 plants, CO2 fixation is done by (1996)

(a) sclerenchyma (b) chlorenchyma and hypodermis (c) mesophyll cells (d) guard cells.

79 ➤ 79. The CO2 fixation during C4 pathway occurs in the chloroplast of (1995)

(a) guard cells (b) bundle sheath cells (c) mesophyll cells (d) spongy parenchyma.

80 ➤ 80. Which one is a C4-plant? (1993)

(a) Papaya (b) Pea (c) Potato (d) Maize/corn

81 ➤ 81. The enzyme that catalyses carbon dioxide fixation in C4 plants is (1992)

(a) RuBP carboxylase (b) PEP carboxylase (c) carbonic anhydrase (d) carboxydismutase.

82 ➤ 82. The first carbon dioxide acceptor in C4-plants is (1992, 1990)

(a) phosphoenol-pyruvate (b) ribulose 1, 5-diphosphate (c) oxaloacetic acid (d) phosphoglyceric acid.

83 ➤ 83. Kranz anatomy is typical of (1990)

(a) C4 plants (b) C3 plants (c) C2 plants (d) CAM plants.

84 ➤ 84. In C4 plants, Calvin cycle operates in (1989)

(a) stroma of bundle sheath chloroplasts (b) grana of bundle sheath chloroplasts (c) grana of mesophyll chloroplasts (d) stroma of mesophyll chloroplasts.

85 ➤ 85. The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of (2020)

(a) 2 molecules of 3-C compound (b) 1 molecule of 3-C compound (c) 1 molecule of 6-C compound (d) 1 molecule of 4-C compound and 1 molecule of 2-C compound

86 ➤ 86. The process which makes major difference between C3 and C4 plants is (NEET-II 2016)

(a) glycolysis (b) Calvin cycle (c) photorespiration (d) respiration.

87 ➤ 87. A process that makes important difference between C3 and C4 plants is (2012)

(a) transpiration (b) glycolysis (c) photosynthesis (d) photorespiration.

88 ➤ 88. The correct sequence of cell organelles during photorespiration is (2012)

(a) chloroplast, Golgi bodies, mitochondria (b) chloroplast, rough endoplasmic reticulum, dictyosomes (c) chloroplast, mitochondria, peroxisome (d) chloroplast, vacuole, peroxisome.

89 ➤ 89. C4 plants are more efficient in photosynthesis than C3 plants due to (2010)

(a) higher leaf area (b) presence of larger number of chloroplasts in the leaf cells (c) presence of thin cuticle (d) lower rate of photorespiration.

90 ➤ 90. During photorespiration, the oxygen consuming reaction(s) occur in (2006)

(a) stroma of chloroplasts (b) stroma of chloroplasts and mitochondria (c) stroma of chloroplasts and peroxisomes (d) grana of chloroplasts and peroxisomes.

91 ➤ 91. Which one of the following is wrong in relation to photorespiration? (2003)

(a) It occurs in chloroplast. (b) It occurs in day time only. (c) It is a characteristic of C, plants. (d) It is a characteristic of C₁ plants.

92 ➤ 92. Photorespiration is favoured by (1996)

(a) high temperature and low O2 (b) high humidity and temperature (c) high O2 and low CO2 (d) high CO2 and low O2

93 ➤ 93. The substrate for photorespiration is (1989)

(a) phosphoglyceric acid (b) glycolate (c) serine (d) glycine.

94 ➤ 94. With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct? (2017)

(a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate. (b) C3 plants respond to higher temperature with enhanced photosynthesis while C, plants have much lower temperature optimum. (c) Tomato is a greenhouse crop which can be grown in CO2-enriched atmosphere for higher yield. (d) Light saturation for CO2 fixation occurs at 10% of full sunlight.

95 ➤ 95. Plants adapted to low light intensity have (2004)

(a) larger photosynthetic unit size than the sun plants (b) higher rate of CO2 fixation than the sun plants (c) more extended root system (d) leaves modified to spines.

96 ➤ 96. The rate of photosynthesis is higher in (1999)

(a) very high light (b) continuous light (c) red light (d) green light.

97 ➤ 97. "The law of limiting factors' was proposed by (1996)

(a) Liebig (b) Hatch and Slack (c) Blackman (d) Arnon.

98 ➤ 98. At a temperature above 35°C (1992)

(a) rate of photosynthesis will decline earlier than that of respiration (b) rate of respiration will decline earlier than that of photosynthesis (c) there is no fixed pattern (d) both decline simultaneously.

99 ➤ 99. During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of (1991)

(a) CO₂ (b) light (c) temperature (d) water.

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