Photosynthesis And Translocation Of Organic Solutes Multiple Choice Questions

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NEET Biology Photosynthesis And Translocation Of Organic Solutes Multiple Choice Questions

Question 1. The oxygen from H->0 is incorporated into :

  1. Oxygen gas
  2. Water
  3. Carbohydrates
  4. NADPH + H+.

Answer: 1. Oxygen gas

Question 2. Engelmatin’s experiment with Spirogyra demonstrated that :

  1. The full spectrum of sunlight is needed for photosynthesis
  2. Only red wavelengths are effective in causing photosynthesis
  3. Only blue wavelengths are effective
  4. Both blue and red wavelengths are effective.

Answer: 4. Both blue and red wavelengths are effective.

Question 3. Red and blue light support the highest rates of synthesis because :

  1. These are the only wavelengths reaching from the sun
  2. These are the only wavelengths that cannot be absorbed
  3. Chlorophyll absorbs these wavelengths more than other wavelengths
  4. These wavelengths have the highest energy visible spectrum.

Answer: 3. Chlorophyll absorbs these wavelengths more than other wavelengths

Question 4. The role of phycobilins in photosynthesis is to :

  1. Absorb and transfer energy to chlorophyll
  2. Donate electrons to the electron transport
  3. Fix carbon dioxide
  4. Carry hydrogen or electrons.

Answer: 1. Absorb and transfer energy to chlorophyll

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Question 5. A cell that lacks chloroplast does not:

  1. Evolve carbon dioxide
  2. Liberate oxygen
  3. Require water
  4. Utilize carbohydrates.

Answer: 2. Liberate oxygen

Photosynthesis MCQs For NEET

Question 6. Energy is transferred from the light reaction step to the dark reaction step by :

  1. Chlorophyll
  2. ADP
  3. ATP
  4. RuBP.

Answer: 3. ATP

Question 7. The thylakoids are removed and kept in a culture medium containing C02 and H2. If the set-up is exposed to light, hexose sugar are not formed as the end product. The most appropriate reason for this will be :

  1. The light trapping device is non-functional
  2. Enzymes involved in CO2 imitation are not available for the process.
  3. The pigment (P?Q0 and P680) are not linked
  4. Carbon assimilation cannot take, place in the light.

Answer: 2. Enzymes involved in CO2 imitation are not available for the process.

Question 8. In photosynthesis the oxygen evolveci1 and oxygen in glucose come from :

  1. H90 and C02 respectively
  2. H20
  3. co2
  4. C02 and H20 respectively.

Answer: 1. H90 and C02 respectively

Question 9. Algae float in the water during day time and sink during night time because :

  1. They become light due to the consumption of food materials in respiration
  2. They lose weight at night
  3. They come up to enjoy the sunshine
  4. They become buoyant in light due to the accumulation of oxygen bubbles released in photosynthesis.

Answer: 4. They become buoyant in light due to the accumulation of oxygen bubbles released in photosynthesis.

Solute Transport And Translocation MCQ Question 10. Quantosome contains :

  1. 200 chlorophyll molecules
  2. 230 chlorophyll molecules
  3. 250 chlorophyll molecules
  4. 300 chlorophyll molecules.

Answer : 3. 250 chlorophyll molecules

Question 11. In photosynthesis chlorophyll serves as :

  1. Hydrogen acceptor
  2. A raw material
  3. An energy converter
  4. As end product.

Answer : 3. An energy converter

Question 12. The first step in photosynthesis is :

  1. Absorption of light by Pigment system I
  2. Production of ATP and NADPH2
  3. Absorption of light by chlorophylls of both Pigment systems I and II
  4. Production of ATP.

Answer : 3. Absorption of light by chlorophylls of both Pigment systems I and II

Photosynthesis MCQs For NEET

Question 13. “Assimilatory Power” is :

  1. ATP
  2. NADPH2
  3. Both (A) and (B)
  4. solar energy.

Answer : 3. Both (A) and (B)

Question 14. In C3 plants initial acceptor of C02 is :

  1. fructose 6-P04
  2. Ribulose 1, 5 diphosphate
  3. Ribulose phosphate
  4. Xylulose 5-P04.

Answer: 2. Ribulose 1, 5 diphosphate

Question 15. The site of dark reaction in plastid is :

  1. Granal lamella
  2. Stroma
  3. Stromal lamella
  4. Outer membrane.

Answer: 2. Stroma

Question 16. The products of the light reaction in photosynthesis are :

  1. ADP and Glucose
  2. ATP and NADPH2
  3. Ferredoxin and Cytochrome b6.
  4. Plastoquinone and Cytochrome

Answer: 2. ATP and NADPH2

Question 17. Chloroplasts fix:

  1. 02
  2. H2
  3. C02
  4. N2.

Answer: 3. C02

Photosynthesis MCQs For NEET

Question 18. The first stable product of carbon assi£nilation in C3 plants is: etc 

  1. 3-Phosphoglyceraldehyde
  2. Glucose otorlq.
  3. Starch
  4. Pyruvic acid.

Answer: 1. 3-Phosphoglyceraldehyde

Question 19. All photosynthetic green plants contain :

  1. chlorophyll a
  2. Chlorophyll b
  3. Chlorophyll c
  4. Chlorophyll d.

Answer: 1. chlorophyll a

Question 20. The principle of limiting factor was proposed by :

  1. Stephen Hales
  2. Ingenhousz
  3. Blackman
  4. Calvin.

Answer: 3. Blackman

Question 21. The sequence of dark reaction of photosynthesis was discovered by :

  1. Blackman
  2. Calvin
  3. Robin Hill
  4. Levitt.

Answer: 2. Calvin

Question 22. Photophosphorylation takes place :

  1. During day time
  2. During night
  3. During both day and night
  4. On rainy days only.

Answer: 1. During day time

Question 23. The process of conversion of light energy into chemical energy is called :

  1. Photoperiodism
  2. Photophosphorylation
  3. Phototropism
  4. Photolysis.

Answer: 2. Photophosphorylation

Question 24. In C4 plants carbon dioxide is initially fixed with :

  1. Adenosine triphosphate
  2. Ribulose diphosphate
  3. Phosphoenol pyruvate
  4. Citric acid.

Answer: 3. Phosphoenolpyruvate

Question 25. Etiolated plants are formed due to a lack of:

  1. Light
  2. Hg
  3. Fe
  4. Mg.

Answer: 1. Light

NEET MCQs on Photosynthesis

Question 26. In photosystem I, the trap centre of energy is :

  1. P 700
  2. Carotene
  3. P 680
  4. Xanthophyll.

Answer: 1. P 700

Question 27. In photosystem II, the trap centre of energy is :

  1. P-700
  2. Carotene
  3. P-680
  4. Xanthophyll.

Answer: 3. P-680

Question 28. In Photosynthesis, the sunlight :

  1. Is converted into kinetic energy
  2. Is converted into chemical energy
  3. Is used as a catalyst.
  4. Plays no role.

Answer: 2. Is converted into chemical energy

Question 29. The role of light in photosynthesis was discovered by :

  1. Priestley
  2. Von Helmont
  3. Ingenhousz
  4. De Saussure.

Answer: 3. Ingenhousz

Transport In Plants MCQ  Question 30. The role of chlorophyll in photosynthesis is the absorption :

  1. And decomposition of water
  2. Of C02 and water
  3. Of light and photolysis of water
  4. Of strong light in the form of chemical energy.

Answer: 3. Of light and photolysis of water

Question 31. During photosynthesis the C02 as one of the raw materials enters and leaves through :

  1. Lenticels
  2. Hydathodes
  3. Stomata
  4. The general surface of leaves.

Answer: 3. Stomata

Question 32. The ratio of the volume of 02 liberated to the volume of C02 absorbed during photosynthesis is known as :

  1. Respiratory quotient
  2. Photosynthetic quotient ‘
  3. Tidal volume
  4. Expiratory reserve volume.

Answer: 2. Photosynthetic quotient ‘

Question 33. The Hill (Light) reaction or photochemical phase of photosynthesis results in the production of:

  1. ATP
  2. 02
  3. NADPH2
  4. All the above.

Answer: 4. All the above.

NEET MCQs on Photosynthesis

Question 34. Which clement is essential for the photolysis of water 7

  1. Nitrogen
  2. Chlorine
  3. Carbon
  4. Oxygen.

Answer: 2. Chlorine

Question 35. In which of the following phases of photosynthesis is C02 usually utilised?

  1. Photochemical phase
  2. Photolysis
  3. Photophosphorylation
  4. Dark reaction,

Answer: 4. Dark reaction,

Question 36. In C4 plants initial C02 fixation takes place in the chloroplasts of:

  1. Guard cells
  2. Spongy mesophyll
  3. Palisade tissue
  4. Bundle sheath.

Answer: 2. Spongy mesophyll

Question 37. What happens during photosynthetic phosphorylation?

  1. ATP is formed
  2. ATP is not formed
  3. 02 is evolved from C02
  4. Water does not join the process.

Answer: 1. ATP is formed

Question 38. In a chloroplast, the site for the light reaction is :

  1. Grana
  2. Stroma
  3. Lamella
  4. Unit membrane.

Answer: 1. GranaGrana

Question 39. Leaves appear green because they :

  1. Absorb green light
  2. Reflect green light
  3. Both absorb and reflect green light
  4. None of the above.

Answer: 2. Reflect green light

NEET MCQs on Photosynthesis

Question 40. Which is a C4 plant?

  1. Tomato
  2. Saccharum
  3. Potato
  4. Pea.

Answer: 2. Saccharum

Question 41. C4 plants are different from C3 plants with reference to the following :

  1. Types of end products of photosynthesis
  2. The initial acceptor of C02 is phosphoenol pyruvate
  3. Types of pigments involved.
  4. No ATP was consumed.

Answer: 2. Initial acceptor of C02 is phosphoenol pyruvate

Question 42. Photorespiration includes :

  1. Hatch and Slack’s cycle
  2. Glycolate cycle x
  3. Krebs’ cycle
  4. Calvin cycle.

Answer: 2. Glycolate cycle x

Question 43. Photorespiration takes place only in:

  1. Green parts of the plant
  2. All the living cells of the plant
  3. Mitochondria
  4. Root.

Answer: 1. Green parts of the plant

Question 44. The leads appear yellow when grown in :

  1. Light
  2. dark
  3. At Hig temperature
  4. At low temperatures.

Answer: 2. dark

Question 45. In the process of photosynthesis, the first step is :

  1. Absorption of CO0
  2. Absorption of 02
  3. Excitation of an electron of chlorophyll by a photon of light
  4. Photolysis of water.

Answer: 3. Excitation of an electron of chlorophyll by a photon of light

Question 46. The substrate for photorespiration is :

  1. Aspartate
  2. Malate
  3. Pyruvate
  4. Glycolate.

Answer: 4. Glycolate.

NEET Important Questions on Photosynthesis

Question 47. Chlorophyll ‘a’ is characterized by the side group of:

  1. Phytol
  2. Keto
  3. Methyl
  4. Aldehyde.

Answer: 3. Methyl

Question 48. Assimilatory powers produced during photosynthesis are:

  1. H20 and 02
  2. RuDP and RuMP
  3. C6H1206 and PGAL
  4. ATP and NADPH2.

Answer: 4. ATP and NADPH2.

Question 49. C4 plants differ from C3 plants with respect to :

  1. Number of ATP molecules consumed
  2. First product
  3. The substrate which accepts carbon dioxide
  4. All the above.

Answer: 2. First product

Question 50. C02 fixation during C4 pathways occurs in the chloro- plast of:

  1. Guard cells
  2. Bundle sheath cells
  3. Spongy parenchyma
  4. Mesophyll cells.

Answer: 2. Bundle sheath cells

Question 51. In plants, the synthesis of chlorophyll occurs in the presence of

  1. Phytochrome
  2. Cytochrome
  3. Light
  4. None of the above.

Answer: 3. Light

Question 52. Persons who got Nobel Prizes for their work in photosynthesis are :

  1. Calvin and Borlang
  2. Calvin and Benson
  3. Beadle and Tatum
  4. Flemming and Waksman.

Answer: 2. Calvin and Benson

Question 53. Chlorophyll is soluble :

  1. In water
  2. In organic solvents
  3. In H20 and organic acids
  4. None of these.

Answer: 2. In organic solvents

NEET Important Questions on Photosynthesis

Question 54. The process of photophosphorylation was studied by :

  1. Calvin
  2. Amon
  3. Priestley
  4. Blackman.

Answer: 2. Amon

Question 55. The ‘Dark Reaction’ in photosynthesis is called so because it :

  1. Cannot occur in light
  2. Needs only darkness
  3. Does not require light energy
  4. Occurs more rapidly at night.

Answer: 3. Does not require light energy

Question 56. In photosynthesis‘02 is liberated due to :

  1. Hydrolysis of carbohydrates
  2. Breakdown Of Chlorophyll
  3. Photolysis of water
  4. Reduction of Carbon dioxide.

Answer: 3. Photolysis of water

Question 57. The correct formula of chlorophyll ‘a’ is :

  1. C55H72O5N4Mg
  2. C55H70O6N4Mg
  3. C55H7405N4Mg
  4. C55H70O5M5Mg.

Answer: 1. C55H72O5N4Mg

NEET Important Questions on Photosynthesis

Question 58. Agranal chloroplasts are a characteristic feature of one of the following: ’

  1. Bundle sheath of sugarcane leaves
  2. Mesophyll of Pea leaves
  3. Bundle sheath of mango leaves
  4. Mesophyll of maize leaves.

Answer: 1. Bundle sheath of sugarcane leaves

Question 59. Which of the following is present at 3 carbon atoms of n pyrrole ring of chlorophyll a molecule?

  1. Aldehyde group
  2. Carboxyl group
  3. Methyl group
  4. Mg.

Answer: 4. Mg.

Question 60. Which of the following occurs in the C3 cycle?

  1. Reductive carboxylation
  2. Oxidative carboxylation
  3. Photophosphorylation
  4. Oxidative phosphorylation.

Answer: 1. Reductive carboxylation

Question 61. Which of the following wavelengths is active in view of photosynthesis?

  1. 400—500 nm
  2. 400—700 nm
  3. 200-150 nm
  4. 510—600 nm.

Answer: 2. 400—700 nm

Question 62. Which pigment is absent in chloroplast? ,

  1. Chlorophyll
  2. Anthocyanin
  3. Xanthophylls
  4. Carotenoids.

Answer: 2. Anthocyanin

Question 63. The C4 cycle was discovered by :

  1. Calvin
  2. Hatch and Slacks
  3. Amon
  4. Blackman.

Answer: 2. Hatch and Slacks

Photosynthesis And Translocation NEET Questions

Question 64. The plant which is used for the study of photosynthesis research is:

  1. Chlamydomonas
  2. Chlorella
  3. Hydrilla
  4. Spinach leaves.

Answer: 2. Chlorella

Question 65. Chlorophyll absorbs :

  1. Red light
  2. Blue light
  3. Greenlight
  4. Both blue and red light.

Answer: 4. Both blue and red light.

Question 66. The Discovery of the Emerson effect has shown the existence of:

  1. Light and dark reaction
  2. Photorespiration
  3. Photophosphorylation
  4. Two distinct pigment systems.

Answer: 4. Two distinct pigment systems.

Question 67. Starch is detected in the leaf:

  1. By white appearance
  2. With iodine solution
  3. Starch granules
  4. Presence of an energy store.

Answer: 2. With iodine solution

Photosynthesis And Translocation NEET Questions

Question 68. Cyclic phosphorylation produces :

  1. ATP and NADPH2.
  2. NADPH2 only
  3. ATP only
  4. ATP, NADPH2 and 02.

Answer: 3. ATP only

Question 69. The path of the C02 molecule during the dark reaction of photosynthesis was successfully traced by the use of :

  1. X-rays
  2. O18
  3. C14
  4. p32

Answer: 3. C14

Photosynthesis And Translocation NEET Questions

 Question 70. Maximal rates of |photosynthesis are obtained in the:

  1. Greenlight
  2. Red light
  3. Far-red
  4. Ultraviolet.

Answer: 2. Red light

Question 71. In C4 plants, C02 is first fixed in:

  1. Palisade parenchyma
  2. Guard cells
  3. Bundle sheath
  4. Spongy mesophyll

Answer: 4. Spongy mesophyll

Question 72. The electron donor in the photosynthetic process taking place in the eukaryotic plants is:

  1. H2S
  2. CO2
  3. ATP
  4. H20.

Answer: 4. H20.

Question 73. Tropical plants show high efficiency of C02 fixation because of:

  1. Calvin cycle
  2. Hatch and Slack pathway
  3. EMP pathway
  4. Krebs’ cycle.

Answer: 2. Hatch and Slack pathway

Photosynthesis And Translocation NEET Questions

Question 74. Which of the following enzymes is used for the carboxylation of RuDP?

  1. carboxylase
  2. Ribulose diphosphate carboxylase
  3. Peroxidase
  4. Phosphopentokinase.

Answer: 2. Ribulose diphosphate carboxylase

Question 75. Q10 is:

  1. The respiratory quotient
  2. Temperature coefficient
  3. Constant in the quantum equation
  4. A scale of quality.

Answer: 2. Temperature co-efficient

Question 76. Grana refers to :

  1. Stacks of thylakoids in plastids of higher plants
  2. A constant in the quantum equation
  3. Glycolysis of glucose
  4. A by-product of photosynthesis.

Answer: 1. Stacks of thylakoids in plastids of higher plants

Question 77. When a green cell transfers light energy into chemical energy which of the following reactions would take place?

  1. ADP + iP = ATP
  2. ATP – iP =s ADP
  3. AMP + iP = AFP
  4. GDP + P = GTP.

Answer: 1. ADP + iP = ATP

Question 78. Starch containing plastids are termed :

  1. Chloroplasts
  2. Chromoplasts
  3. Amyloplasts
  4. Leucoplasts.

Answer: 3. Amyloplasts

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Photosynthesis MCQ Question 79. The electron carriers which in close association with photosynthetic pigment systems form an electron transport chain are :

  1. Present in the cytoplasm
  2. Present on the outer membrane of green plastids
  3. Bound to thylakoids
  4. Dissolved in stroma of chloroplasts.

Answer: 3. Bound to thylakoids

Question 80. Photorespiration is favoured by :

  1. High 02 and low C09
  2. Low 02 and high C02
  3. Low temperature and high 02
  4. Low light and high 02.

Answer: 1. High 02 and low C09

Question 81. Which of the following statements is correct about the C4 type of photosynthesis?

  1. The C4 cycle is an independent cycle
  2. The C4 cycle is adjunct to the Calvin cycle
  3. RuBP carboxylase has a higher affinity for CC)2
  4. Carboxylase is present in the bundle sheath cells.

Answer: 2. The C4 cycle is adjunct to the Calvin cycle

Question 82. C02 is used during :

  1. Light reaction
  2. Dark reaction
  3. Photolysis
  4. Grana.

Answer: 2. Dark reaction

Question 83. NADP+ is reduced to NADPH2 in:

  1. Photosystem-I
  2. Photosystem-II
  3. Photolysis
  4. Krebs’ cycle.

Answer: 2. Photosystem-II

Question 84. The light energy used by the higher plants for photo¬synthesis is only about:

  1. 1-2%
  2. 30%
  3. 70%
  4. 85%.

Answer: 1. 1-2%

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Question 85. Calvin used which plant to trace out the carbon path.

  1. Spirogyra
  2. Chlamydomonas
  3. Chlorococcum
  4. Chlorella and Scenedesmus.

Answer: 4. Chlorella and Scenedesmus.

Question 86. Calvin cycle was investigated by the use of:

  1. C12
  2. O16
  3. C16
  4. C14.

Answer: 4. C14.

Question 87. Photorespiration is favoured by :

  1. High 02 and low C02 levels
  2. Low light intensity
  3. Low 02 and high CO-, levels
  4. Low temperature.

Answer: 1. High 02 and low C02 levels

Question 88. The isotopes that have proved useful in research on photosynthesis are :

  1. O18 and O14
  2. C11 andP32
  3. P32 and O18
  4. C14 and O18.

Answer: 4. C14 and O18

Question 89. Photosynthesis rate per unit of light energy would be more in:

  1. Intermittent sunlight
  2. Normal sunlight
  3. Bright regular sunlight
  4. Weak sunlight.

Answer: 1. Intermittent sunlight

Question 90. What is the smallest photosynthetically functional unit?

  1. Photon
  2. Electron
  3. Quantosome
  4. Chlorophyll.

Answer: 3. Quantosome

Question 91. Which one of the following crops is an efficient converter of solar energy and has a net productivity value of 2 to 4 kg. m2 per year?

  1. Bajra
  2. Sugarcane
  3. Wheat
  4. Rice.

Answer: 2. Sugarcane

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Question 92. In the C4 plants, the C4 cycle occurs in the mesophyll cells and the C3 cycle occurs in the bundle sheath cells. But in CAM plants:

  1. C4 and C3 cycles occur in the mesophyll cells only
  2. The C4 cycle occurs very rarely.
  3. The C4 cycle occurs in bundle sheath cells and the C3 cycle in mesophyll cells; to
  4. C4 and C3 cycles occur in bundle sheath cells.

Answer: 1. C4 and C3 cycles occur in the mesophyll cells only

Question 93. Photorespiration occurs in :

  1. C3 plants
  2. All plants
  3. Algae only
  4. C4 plant

Answer: 1. C3 plants

Question 94. The plants like sugarcane, maize^Qypenis etc. show high efficiency^ ,C02 fixation because of:

  1. Hatch-Slack cycle
  2. Photophosphorylation
  3. Blackman’s law of limiting factor
  4. Calvin cycle.

Answer: 1. Hatch-Slack cycle

Question 95. Photosynthetic rate is independent of:

  1. temperature
  2. Light intensity
  3. Light quality
  4. Light duration.

Answer: 4. Light duration.

Question 96. In C4 plants. Calvin cycle

  1. Does not operate because PEP carboxylase fixes most of the CO, and leaves only a little of it for Calvin cycle
  2. Operates in the stroma of bundle sheath
  3. Operates in the grana of bundle sheath chloroplast
  4. Operates in the mesophyll chloroplast only.

Answer: 2. Operates in the stroma of bundle sheath

Question 97. Which one of the following is the most appropriate reason for storing green-coloured apples at low temperatures?

  1. Photosynthesis and respiration are completely inhibited
  2. The rate of respiration is reduced
  3. The rate of photosynthesis is reduced
  4. The rate of photosynthesis and respiration are reduced.

Answer: 4. Rate of photosynthesis and respiration are reduced.

Question 98. The specific function of light energy in the photosynthesis process is to :

  1. Activate chlorophyll
  2. Split water
  3. Reduce CO,
  4. Synthesise glucose.

Answer: 2. Split water

Photosynthesis MCQs For NEET

Question 99. Which of the following wavelengths of light is absorbed maximum for photosynthesis?

  1. 640 nm
  2. 440 nm
  3. 680 nm
  4. 700 nm.

Answer: 3. 680 nm

Question 100. Quanta required for assimilation of one mol. of CO,/0, liberation in photosynthesis are :

  1. 8
  2. 6
  3. 4
  4. 2.

Answer: 1. 8

Question 101. In an experiment to demonstrate the liberation of oxygen during photosynthesis in a fresh spring of the aquatic plant Hydrilla, 2 sets were arranged. The first set was with ordinary tap water (control set-up) and the second set was with an equal volume of brown aerated water. The evolution of Of, bubbles in the brown aerated water set will :

  1. Increase only initially
  2. Rapidly decrease
  3. Remain unaltered
  4. Cease to occur almost instantaneously.

Answer: 2. Rapidly decrease

Question 102. Which of the following is not a C4 plant?

  1. Cyperus
  2. Potato
  3. Saccharum officinarum
  4. All the above.

Answer: 2. Potato

Photosynthesis MCQs For NEET

Question 103. Purple sulphur bacteria are :

  1. Saprophytic
  2. Chemosynthetic
  3. Heterotrophic
  4. Photosynthetic.

Answer: 4. Photosynthetic

Question 104. The connecting link between respiration and photosynthesis is :

  1. Ribulose-1, 5-diphosphate
  2. 3-phosphoglyceraldehyde
  3. Glucose
  4. Sedo heptulose-1, 7, diphosphate.

Answer: 2. 3-phosphoglyceraldehyde

Question 105. Non-cyclic photophosphorylation involves :

  1. Pigment system II only
  2. Pigment system I only
  3. Both pigment systems I and II
  4. None of the above.

Answer: 3. Both pigment systems I and II

Question 106. The pigment that absorbs red and far-red light in plants is:

  1. Cytochrome
  2. Xanthophyll
  3. Phytochrome
  4. Carotene.

Answer: 3. Phytochrome

Question 107. When PGA is changed into phosphoglyceraldehyde during photosynthesis, which of the following reactions occurs?

  1. Oxidation
  2. Reduction
  3. Electrolysis
  4. Hydrolysis.

Answer: 2. Reduction

NEET MCQs on Photosynthesis

Question 108. During ATP synthesis, electrons pass through :

  1. C02
  2. 02
  3. H20
  4. Cytochromes.

Answer: 4. Cytochromes.

Question 109. 85-90% (or nine-tenth) of all the photosynthesis of the world is carried out by :

  1. Large trees with millions of branches and leaves
  2. Algae of the ocean
  3. Ferns of forest
  4. Scientists in the laboratory.

Answer: 2. Algae of the ocean

Question 110. Chemiosmosis requires a membrane, a proton pump and :

  1. ATPase only
  2. Proton gradient
  3. NADPH
  4. Proton gradient and ATPs

Answer: 4. Proton gradient and ATPs

Question 111. The main difference between the two light reactions of photosynthesis is :

  1. Photosystem I emits electrons to be transferred to Photosystem II
  2. Photosystem I generates strong reductant NADPH and Photosystem II a strong oxidant
  3. Photosystem I produces a strong oxidant and photosystem II a strong reductant NADPH
  4. Photosystem I produces ATP while Photosystem II does not produce ATP.

Answer: 2. Photosystem I generates strong reductant NADPH and Photosystem II a strong oxidant

Question 112. The C4 plants show :

  1. Higher transpiration and no photorespiration
  2. Low transpiration and no photorespiration
  3. High transpiration and photorespiration
  4. Low transpiration and photorespiration.

Answer: 2. Low transpiration and no photorespiration

Question 113. The light reactions of photosynthesis are initiated by :

  1. P 700 and P 680
  2. P 700, P 680 and Chi. b
  3. All components of chi. a
  4. P 700, P 695, P 680 and Chi. b.

Answer: 1. P 700 and P 680

Question 114. According to a recent Z-scheme, the electron released on behalf of PS II is accepted by :

  1. Quinone
  2. Ferredoxin
  3. F.R.S.
  4. Phaeophytin.

Answer: 1. Quinone

Question 115. The gap electron of PS II is filled due to the supply of electrons from :

  1. Plastocyanin
  2. Plastoquinone
  3. Photolysis of water
  4. Fe-S protein.

Answer: 3. Photolysis of water

Question 116. The PS II is thought to be bound to :

  1. Mn-Protein
  2. Fe-S protein iL
  3. Quinones
  4. Cytochromes.

Answer: 1. Mn-Protein

Question 117. If isolated chloroplasts suspended in an aqueous medium are supplied with inorganic phosphates, ADP, and NADP are illuminated they show :

  1. Complete photosynthesis
  2. Only Hill reaction
  3. Only cyclic phosphorylation
  4. Non-cyclic photophosphorylation.

Answer: 4. Non-cyclic photophosphorylation.

Question 118. The scientist who discovered atmospheric CO, concentration to be suboptimal for photosynthesis is :

  1. Godlewski
  2. Bossingault
  3. Dutrochet
  4. De Saussure.

Answer: 1. Godlewski

NEET MCQs on Photosynthesis

Question 119. Wilmott’s bubbler is meant to prove:

  1. CO is necessary for photosynthesis
  2. Light is necessary for photosynthesis
  3. Oxygen is evolved during photosynthesis
  4. Chlorophyll is essential for photosynthesis.

Answer: 3. Oxygen is evolved during photosynthesis

Question 120. The sap that flows out of the tire stem comes from :

  1. xylem
  2. Phloem
  3. Medullary rays
  4. Pith.

Answer: 2. Phloem

Question 121. Though potato tubers do not manufacture organic food, it is stored in them in large amounts. This is due to :

  1. Conversion of starch into the tuber
  2. Synthesis of food in the leaves, its translocation to the tubers and conversion into starch
  3. Synthesis of hexose sugar
  4. Formation of sugars and their conversion into starch in the tubers themselves.

Answer: 2. Synthesis of food in the leaves, its translocation to the tubers and conversion into s

Question 122. C4 plants are better adapted to tropical and desert areas because:

  1. Sunlight is more intense and the growing season is longer
  2. They can maintain a high rate of photosynthesis under water stress conditions
  3. They possess chloroplasts only in bundles in bundle sheaths
  4. Of all the above.

Answer: 3. They possess chloroplasts only in bundles in bundle sheaths

Question 123. In the following diagram if A represents water and carbon dioxide then

Photosynthesis And Translocation Of Organic Solutes In The Following Diagram Question .123

  1. I is photosynthesis, El is respiration and B is CH20 and oxygen
  2. I-is photosynthesis, Il-is respiration and B is C02 and H20
  3. I is respiration, II is photosynthesis and B is CH20 and O,
  4. I is respiration, II is photosynthesis and B is C02 and water.

Answer: 3. I is respiration, II is photosynthesis and B is CH20 and O,

Question 124. The difference between NAD+ and NADP4- is :

  1. One carries electrons to the electron transport system and the other carries them to synthetic reactions
  2. Only NAD+ production requires niacin in the diet
  3. One contains high-energy phosphate bonds and the other does not
  4. All of the above are correct.

Answer: 1. One carries electrons to the electron transport system and the other carries them to synthetic reactions

Question 125. A major drawback of Munch’s hypothesis is :

  1. It involves a turgor pressure gradient
  2. It explains unidirectional flow only
  3. It involves permeability throughout the mass
  4. Translocation is by the mass flow of solutes.

Answer: 2. It explains unidirectional flow only

Question 126. ‘High energy’ electrons from PS-I pass to NADP where they combine with hydrogen ions, which come from the initial photolysis of water, to form :

  1. ADP
  2. NADPH2
  3. FAD
  4. NAD.

Answer: 2. NADPH2

Question 127. In C4 plants, as opposed to C3 plants, the enzyme PEPase fixes carbon dioxide to PEP to form :

  1. Phosphoglycerate
  2. Oxalo succinate
  3. Oxaloacetate
  4. Dihydroxy acetone phosphate.

Answer: 3. Oxaloacetate

Question 128. If the plant is first exposed to light of 7300 A length and then to light of 6600 A, the plant:

  1. Will show inhibited growth activity
  2. Will resume normal growth activity
  3. Will not grow at all
  4. Will die.

Answer: 2. Will resume normal growth activity

Question 129. The cyclic electron pathway begins after :

  1. Photosystem I complex absorbs solar energy
  2. Photosystem II complex absorbs solar energy
  3. Both photosystem I and II absorb solar energy
  4. None of the above.

Answer: 2. Photosystem II complex absorbs solar energy

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