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Plant Physiology MCQ

177 MCQ questions with answers and explanations · page 3 of 8

Test yourself▶ 25 question test▶ 50 question test

Q51. Which one of the following gas comes out during photosynthesis ?

  1. AOxygen
  2. BCarbondioxide
  3. CHydrogen
  4. DChlorine
Show answer & explanation

Answer: A) Oxygen

Q52. Which one of the following statement is false?

  1. APhotosynthesis occur in presence of sunlight
  2. BCO2 is used during photosynthesis
  3. CO2 is used during photosynthesis
  4. DO2 comes out during photosynthesis
Show answer & explanation

Answer: C) O2 is used during photosynthesis

Q53. The oxygen in photosynthesis is released from-

  1. ACO2
  2. BH2O
  3. CBoth CO2 & H2O
  4. DChlorophyll
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Answer: B) H2O

Q54. Photosynthesis takes place in the presence of chlorophyll and……

  1. AWater
  2. BNutrients
  3. CCarbondioxide
  4. DSunlight
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Answer: D) Sunlight

Q55. In photosynthesis-

  1. ALight energy is converted into chemical energy
  2. BChemical energy is converted into light energy
  3. CChemical energy is converted into electrical energy
  4. DLight energy is converted into mechanical energy
Show answer & explanation

Answer: A) Light energy is converted into chemical energy

Q56. When chlorophyll absorbs light, it gets excited and emits-

  1. AOxygen
  2. BWater
  3. CElectrons
  4. DEnergy rich compound
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Answer: C) Electrons

Q57. The plants receive Nitrogen in from of

  1. ANitric oxide
  2. BNitrate
  3. CAmmonia
  4. DNitride
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Answer: B) Nitrate

Q58. Photosynthesis organelles found in plant cell-

  1. AMitochondria
  2. BGolgi bodies
  3. CChloroplast
  4. DLysosomes
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Answer: C) Chloroplast

Q59. For the growth of plants in length, which of the following is not essential ?

  1. ACalcium
  2. BSodium
  3. CNitrogen
  4. DPhosphorus
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Answer: B) Sodium

Q60. The plant growth regulators are small, simple molecules of diverse chemical composition. They are-

  1. Acarbohydrates, fats and proteins
  2. Bindole compounds, adenine derivatives, carotenoids and terpenes
  3. Cfatty acids, glucose and vitamins
  4. Dvitamin-C, vitamin-D and glucose
Show answer & explanation

Answer: B) indole compounds, adenine derivatives, carotenoids and terpenes

Q61. Which equation shows the reaction of photosynthesis ?

  1. ACO2 + H2O — CH2O + O2
  2. B6CO2 + 12H2O — C6H12O6 + 6O2 + 6H2O
  3. C6CO2 + 6H2O — C6H12O6 + 6O2
  4. DC6H12O6 + 6O2 — 6CO2 + 6H2O
Show answer & explanation

Answer: B) 6CO2 + 12H2O — C6H12O6 + 6O2 + 6H2O

Q62. Beside water and light which is more essential as a raw material for photosynthesis ?

  1. ACO2
  2. BO2
  3. CMineral salt
  4. DNAD
Show answer & explanation

Answer: A) CO2

Q63. The process in which water is split during photosynthesis is-

  1. APhotolysis
  2. BHydrolysis
  3. CPlasmolysis
  4. DHemolysis
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Answer: A) Photolysis

Q64. Which gas is essential for photosynthesis ?

  1. AO2
  2. BCO2
  3. CN2
  4. DCO
Show answer & explanation

Answer: B) CO2

Q65. First step of photosynthesis is-

  1. AActivation of chlorophyll by sunlight
  2. BOxygen comes out from water
  3. CFormation of carbohydrate
  4. DFixation of carbon dioxide
Show answer & explanation

Answer: A) Activation of chlorophyll by sunlight

Q66. An element present in chlorophyll-

  1. ACa
  2. BFe
  3. CMg
  4. DS
Show answer & explanation

Answer: C) Mg

Q67. Process by which plant prepare their food is-

  1. ACarbohydrolysis
  2. BMetabolic synthesis
  3. CPhotosynthesis
  4. DPhotosensitization
Show answer & explanation

Answer: C) Photosynthesis

Q68. Most of photosynthesis process occur in-

  1. ABlue and red region of light
  2. BIn the green and yellow region of light
  3. CIn the blue and orange region of light
  4. DIn the violet and orange region of light
Show answer & explanation

Answer: A) Blue and red region of light

Q69. Role of chlorophyll in photosynthesis-

  1. AAbsorption of water
  2. BAbsorption of light energy
  3. CAbsorption of CO2
  4. DNone of these
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Answer: B) Absorption of light energy

Q70. Which of the following gas is absorbed during photosynthesis ?

  1. AN2
  2. BCO2
  3. CO2
  4. DWater vapour
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Answer: B) CO2

Q71. First compound which is fixed during photosynthesis is-

  1. APhosphoglyceric acid
  2. BStarch
  3. CGlucose
  4. DDiphosphoglyceric acid
Show answer & explanation

Answer: C) Glucose

Q72. Name a biological process in which glucose and fat is oxidised to librate energy-

  1. APhotosynthesis
  2. BRespiration
  3. CTranspiration
  4. DFermentation
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Answer: B) Respiration

Q73. Percentage of light energy utilised for photosynthesis by higher plant is-

  1. A1
  2. B0.5
  3. C0.1
  4. D0.01
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Answer: D) 0.01

Q74. Compensation point is the value of a factor where there is-

  1. ABeginning of photosynthesis
  2. BLittle photosynthesis
  3. CPhotosynthesis equal to rate of respiration
  4. DNeither photosynthesis nor respiration
Show answer & explanation

Answer: C) Photosynthesis equal to rate of respiration

Q75. Leaves are green because they

  1. AAbsorb green light
  2. BDo not absorb but reflect green light
  3. CUtilise green light
  4. DAbsorb and reflect green light
Show answer & explanation

Answer: B) Do not absorb but reflect green light

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