Plant Physiology Multiple Choice Questions
1. Element present in nucleic acids, Phospholipids, ATP, ADP and NADPH is ______
A. P
B. Na
C. Bo
D. Co
Answer: A
2. ______ are required for chlorophyll synthesis
A. Fe and Mg
B. Fe and Co
C. Cu and Ca
D. Mg and Ca
Answer: A
3. In which form Ca is present in plants?
A. Calcium pectate
B. Calcium carbonate
C. Calcium
D. CaCl
Answer: A
4. Nitrate reductase system in which element is major component?
A. Mo
B. N
C. H
D. None of the above
Answer: A
5. Which element is essential for activating the enzyme but not a part of enzyme?
A. Mn
B. Mg
C. K
D. Co
Answer: C
6. For the selective permeability of the cell membranes which element is involved?
A. K
B. Fe
C. P
D. Ca
Answer: D
7. Which element is essential for pollen germination?
A. Na
B. B
C. Mo
D. Co
Answer: B
8. In photosynthesis which element is essential for the evolution of oxygen?
A. CI
B. Mg
C. Fe
D. All of the above
Answer: A
9. In leguminous plants leghemoglobin protects _____ activity
A. Nitrogenase
B. Protiase
C. Nitrate reductase
D. Both A and B
Answer: C
10. In Nitrogen fixation and metabolism which element is play major role?
A. Mn
B. B
C. Mg
D. Mo
Answer: D
11. Main source of elements for nitrate reductase is ferredoxin which is present in ______
A. Endoplasmic reticulum
B. Mitochondria
C. Chloroplasts
D. Golgi complex
Answer: C
12. Nitrobacter convert NO2 into NO3 in which process
A. Reduction
B. Oxidation
C. Both A and B
D. None of the above
Answer: B
13. Which element responsible of an anaerobic nitrogen fixing bacteria, Clostridium is _____
A. Potassium
B. Phosphorous
C. Nitrogen
D. Sodium
Answer: A
14. In plant ______ is responsible for guttation
A. Root pressure
B. Photosynthesis
C. Transpiration
D. Osmosis
Answer: A
15. Root pressure introduced by Stephen Hales and it is absent in _______
A. Mango
B. Dicots
C. Gymnosperms
D. None of the above
Answer: C
16. Which is selectively permeable membrane of the cell ______
A. Cell wall
B. Cytoplasm
C. Plasmalemma
D. None of the above
Answer: C
17. Which plants Scotoactive stomata perform
A. C3 photosynthesis
B. C4 photosynthesis
C. Both A and B
D. CAM photosynthesis
Answer: D
18. The chemical use an antitranspirant is ______
A. Salicylic acid
B. Abscisic acid
C. Phenylmercuric acid
D. All of the above
Answer: D
19. Sub epidermal evaporation of water exhibit in plant during
A. Photosynthesis
B. Guttation
C. Respiration
D. Transpiration
Answer: D
20. The best light for stomatal opening is ______
A. Red
B. Yellow
C. Green
D. Blue
Answer: D
21. During high wind velocity, the stomata of plants ______
A. Remain open
B. Close down
C. Open more widely
D. Remain unaffected
Answer: B
22. Optimum temperature for water absorption is ______
A. 0 – 5 °C
B. 20 – 25 °C
C. 45 – 65°C
D. 5 – 20°C
Answer: B
23. The transport of sap from root to top of the dicot plant is ______
A. Transport
B. Translocation
C. Ascent of sap
D. All of the above
Answer: C
24. Selective passage across a semipermeable membrane is called ______
A. Osmosis
B. Diffusion
C. Both A and B
D. Imbibition
Answer: A
25. Stomata open at night but close during day time in which plants?
A. Xerophytes
B. Mesophytes
C. Succulents
D. Both A and B
Answer: C
26. In the plant number of stomata present per cm of a common leaf is about
A. 2 million
B. More then 100000
C. 10000
D. Less than 1000
Answer: B
27. The most important factor in stomatal opening in the plant is ______
A. Protein percentage of sap
B. Shape of guard cells
C. Hormone content of cell
D. Chlorophyll content in cell
Answer: B
28. Which plant hormone is associated with closing of stomata?
A. IBA
B. GA
C. ABA
D. All of the above
Answer: C
29. Which enzyme plays major role in opening and closing of stomata?
A. Beta-amylase
B. Pyruvic kinase
C. RuDP
D. PEP carboxylase
Answer: D
30. Absorption of water and minerals take place in which part of root?
A. Root cap tip
B. Root hairs
C. Root epidermis
D. Root endodermis
Answer: B
31. The highest root pressure exhibit in plants is _________
A. 4 bars
B. 15 bars
C. 10 bars
D. None of the above
Answer: B
32. Which nutrient is obtained by insectivorous plants from insect bodies?
A. P
B. K
C. N
D. Na
Answer: C
33. In Himalayan forest commonly N2 fixing bacteria is _____
A. Azotobacter
B. Frankia
C. Nitrobacter
D. None of the above
Answer: B
34. The enzyme responsible for atmospheric nitrogen fixation is _____
A. Nitrogenase
B. Amylase
C. Nitrogenase and Amylase
D. Lemda nitrogenage
Answer: A
35. In which method ions are absorbed by plants
A. By carriers and pumps
B. By carriers method
C. By difference in DPD
D. By molecular diffusion
Answer: A
36. The most effective cofactor for enzyme is ______
A. Mn
B. Na
C. K
D. Ca
Answer: C
37. Flowering plants adapted to absorb which ions
A. NO3–
B. NO3+2
C. NH3
D. NO2
Answer: A
38. Bidirectional translocation of minerals occurs in plants
A. Phloem
B. Xylem
C. Cambium
D. Perenchyma and phloem
Answer: A
39. Nodule formation of legume roots is reduced during deficiency of _____
A. S and B
B. N
C. K
D. CI
Answer: A
40. Boron help in _________
A. Photosynthesis
B. Sugar transport
C. Acting as a co-factors
D. Both A and C
Answer: B
41. Nitrification process is done by _____
A. Rhizobium
B. B. bassiana
C. Pseudomonas
D. Nitrococcus
Answer: A
42. Transpiration mostly affected by _____
A. Humidity
B. Temperature
C. Light
D. Wind
Answer: A
43. Transpiration pull help in passive absorption of water that depends on ______
A. Negative water potential of atm.
B. Cohesion and adhesion of water
C. Positive water potential
D. Both B and C
Answer: A
44. In plants stomatal movement is known as ______
A. Nastic movement
B. Physiotactic movement
C. Geotactic movement
D. Phototaxic movement
Answer: A
45. Which enzyme is not proteinaceous in nature?
A. Ribozyme
B. Both A and B
C. Isozyme
D. Trypsin
Answer: A
46. Below the freezing point enzyme are inactivated but at which temperature activity would be maximum?
A. 22°C
B. 35°C
C. 54°C
D. 25°C
Answer: B
47. Phosphofructokinase major enzyme in glycolysis is inhibited by _________
A. ATP
B. ADP
C. Citrate
D. Both A and C
Answer: D
48. Pyruvate dehydrogenease complex and glycolytic pathway is located in __________
A. Cytosol and Mitochondria
B. Cytosol
C. Golgi bodies
D. Microsomes
Answer: A
49. Which is responsible for Acetyl CoA carboxylase activation
A. Citrate and insulin
B. Isozyme
C. Trypsin
D. All of the above
Answer: A
50. Most C4 plants are native _____
A. Xerix habitats
B. Merine habitats
C. Grass habitats
D. All habitats
Answer: A
51. Photosynthetic yield will be maximum in ________
A. Intermittent white light
B. Continuous blue light
C. Red light
D. Yellow light
Answer: A
52. Photosynthetically active radiation wavelength ranging from ______
A. 340 – 450
B. 200 – 300
C. 400 – 700
D. 640 – 650
Answer: C
53. Which is involve in photosynthesis
A. Blackman and Hill
B. Krebs cycle reaction
C. E.M.P. Pathway
D. None of the above
Answer: A
54. Hill reaction take place in Granna formed
A. ATP and NADPH2 both
B. NADPH2
C. ADP
D. All of the above
Answer: A
55. Photosynthesis is most active and fast in _______
A. Blue light
B. White light
C. Red light
D. UV light
Answer: C
56. Which is immediate electron donor to PS-I
A. Plastocyanin
B. Plastometheonin
C. Ferredoxinin
D. Both B and C
Answer: A
57. Anabolic process is _____
A. Photosynthesis
B. Transpiration
C. Both A and B
D. None of the above
Answer: A
58. Absorption of light take place during photosynthesis
A. Photosystem-I only
B. Photosystem-II only
C. Photosystem-I and Photosystem-II
D. None of the above
Answer: C
59. In C4 pathway
A. O2 combine with PGA
B. CO2 combine with PEP
C. CO2 combine with RMP
D. All of the above
Answer: B
60. Dark reaction of photosynthesis occurs in ______
A. Stomata
B. Stroma and matrix
C. Stroma
D. Granna
Answer: C
61. In C4 plants first CO2 acceptor is _________
A. Oxaloacetic acid
B. Phosphoenol-pyruvate
C. Oxalo butaric acid
D. Pyruvic acid
Answer: B
62. Kranz anatomy found in ______
A. Leaves
B. Stem
C. Flower
D. Seed
Answer: C
63. Calvin cycle involves reductive carboxylation occurs in ________
A. Chloroplast
B. Cytochrom
C. Peroxisome
D. Cytoplasm
Answer: A
64. RUBISCO content of chlorophyll is _________
A. 10%
B. 15%
C. 5%
D. 7%
Answer: C
65. Dye used in Hill reaction by Stephan Hill
A. Methylene blue
B. Erosine
C. Sulphure green
D. Both A and B
Answer: C
66. First stable product of C4 photosynthesis is __________
A. Malic acid
B. Rubilose 1, 5, biophosphate
C. Phosphoglyceric acid
D. Both B and C
Answer: A
67. At which time acid concentration in CAM plants is maximum
A. Dusk
B. Down
C. Night
D. Day
Answer: B
68. During photosynthesis which element is essential for photolysis of water?
A. Co
B. C
C. Cl
D. N
Answer: C
69. Respiratory quotient (R.Q.) is less than one when the respiratory substrate is ______
A. Sucrose
B. Fat
C. Glucose
D. Fructose
Answer: B
70. Number of ATP produced from one pyruvic acid during conversion of acetyl CoA is _____
A. 5
B. 10
C. 3
D. 1
Answer: C
71. During aerobic respiration net number of water molecules produced per molecule of glucose is ______
A. 6
B. 5
C. 4
D. 8
Answer: A
72. Net ATP molecules formed in glycolysis is ______
A. 38
B. 12
C. 2
D. 1
Answer: C
73. One NADH2 produce number of ATP is ______
A. 6 ATP
B. 1 ATP
C. 38 ATP
D. 3 ATP
Answer: D
74. Glycolysis takes place in cytoplasm and the end product is ______
A. Pyruvic acid
B. Oxylic acid
C. Glucose
D. 30 ATP
Answer: A
75. Calvin cycle is reductive carboxylation and final product of this cycle is ______
A. Pyruvic acid
B. Phosphoglycer-aldehyde
C. Phosphoglyceric acid
D. Both A and B
Answer: B
76. TCA cycle occur in mitochondria and intermediate between glycolysis and TCA cycle is _____
A. Oxaloacetate
B. Pyruvic acid
C. Acetyl-Co A
D. Both A and B
Answer: C
77. The net gain of energy from one molecule of sucrose in aerobic respiration is ______
A. 38 ATP
B. 76 ATP
C. 37 ATP
D. 79 ATP
Answer: B
78. The net gain of energy from one gram mole of glucose during aerobic respiration is _____
A. 36 ATP
B. 42 ATP
C. 38 ATP
D. 40 ATP
Answer: C
79. When 4 molecules of phosphoglyceraldehyde are converted into 4 molecules of pyruvate than how many molecules of NADH are produced
A. 2
B. 7
C. 4
D. 8
Answer: C
80. Cytochromes help in plant growth, which is reacts with O2 in electron transport system
A. Cyt. a3
B. Cyt. b3
C. Cyt. c3
D. Cytf
Answer: A
81. Common precursor in CAM, UMP and TMP is ________
A. Aspartate
B. Glutamine
C. Glutamate
D. Adenosine
Answer: A
82. To fix 1 molecule of N 12 ATP molecule are required and N fixation is carried out by the enzyme
A. Nitrogenase and Rubisco
C. Nitrite reductase only
B. Nitrogenase only
D. Nitrate reductase
Answer: B
83. The natural occurring in higher plant is _________
A. IAA
B. IBA
C. NAA
D. IBA and NAA
Answer: A
84. Dwarfness of the plant can be control by _____
A. IAA
B. MH
C. GA
D. IBA
Answer: C
85. Polar translocation of plant hormone found in ______
A. Auxin
B. GA
C. Cytokinin
D. Zeatin
Answer: A
86. An essential growth substance required in tissue culture and delay the chlorophyll loss
A. GA
B. Kinetin
C. Cytokinin
D. Auxin
Answer: C
87. Tress hormone is ______
A. GA
B. IAA
C. ABA
D. Both A and B
Answer: C
88. Flowering of short day and long day plant is promoted by ________
A. IAA and GA respectively
B. GA only
C. Cytokinin and GA respectively
D. Kinetin and GA respectively
Answer: C
89. Chemitropism is _______
A. Growth of pollen tube toward ovule
B. Growth of pollen tube stigma to ovary
C. Movement of anthrozoids
D. Both A and B
Answer: A
90. Hormone involve in phototropism is _________
A. IAA
B. GA
C. Kinetin
D. Cytokinin
Answer: A