90 + Objective Type Questions and Answers on Plant Physiology for Students!
1. Element present in nucleic acids, Phospholipids, ATP, ADP and NADPH is ______
(A) P
(B) Na
(C) Bo
(D) Co
Ans. A
2. ______ are required for chlorophyll synthesis
(A) Fe and Mg
(B) Fe and Co
(C) Cu and Ca
(D) Mg and Ca
Ans. A
3. In which form Ca is present in plants?
(A) Calcium pectate
(B) Calcium carbonate
(C) Calcium
(D) CaCl
Ans. A
4. Nitrate reductase system in which element is major component?
(A) Mo
(B) N
(C) H
(D) None of the above
Ans. A
5. Which element is essential for activating the enzyme but not a part of enzyme?
(A) Mn
(B) Mg
(C) K
(D) Co
Ans. C
6. For the selective permeability of the cell membranes which element is involved?
(A) K
(B) Fe
(C) P
(D) Ca
Ans. D
7. Which element is essential for pollen germination?
(A) Na
(B) B
(C) Mo
(D) Co
Ans. B
8. In photosynthesis which element is essential for the evolution of oxygen?
(A) CI
(B) Mg
(C) Fe
(D) All of the above
Ans. A
9. In leguminous plants leghemoglobin protects _____ activity
(A) Nitrogenase
(B) Protiase
(C) Nitrate reductase
(D) Both A and B
Ans. C
10. In Nitrogen fixation and metabolism which element is play major role?
(A) Mn
(B) B
(C) Mg
(D) Mo
Ans. 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
Ans. C
12. Nitrobacter convert NO2 into NO3 in which process
(A) Reduction
(B) Oxidation
(C) Both A and B
(D) None of the above
Ans. B
13. Which element responsible of an anaerobic nitrogen fixing bacteria, Clostridium is _____
(A) Potassium
(B) Phosphorous
(C) Nitrogen
(D) Sodium
Ans. A
14. In plant ______ is responsible for guttation
(A) Root pressure
(B) Photosynthesis
(C) Transpiration
(D) Osmosis
Ans. A
15. Root pressure introduced by Stephen Hales and it is absent in _______
(A) Mango
(B) Dicots
(C) Gymnosperms
(D) None of the above
Ans. C
16. Which is selectively permeable membrane of the cell ______
(A) Cell wall
(B) Cytoplasm
(C) Plasmalemma
(D) None of the above
Ans. C
17. Which plants Scotoactive stomata perform
(A) C3 photosynthesis
(B) C4 photosynthesis
(C) Both A and B
(D) CAM photosynthesis
Ans. D
18. The chemical use an antitranspirant is ______
(A) Salicylic acid
(B) Abscisic acid
(C) Phenylmercuric acid
(D) All of the above
Ans. D
19. Sub epidermal evaporation of water exhibit in plant during
(A) Photosynthesis
(B) Guttation
(C) Respiration
(D) Transpiration
Ans. D
20. The best light for stomatal opening is ______
(A) Red
(B) Yellow
(C) Green
(D) Blue
Ans. D
21. During high wind velocity, the stomata of plants ______
(A) Remain open
(B) Close down
(C) Open more widely
(D) Remain unaffected
Ans. B
22. Optimum temperature for water absorption is ______
(A) 0 – 5 °C
(B) 20 – 25 °C
(C) 45 – 65°C
(D) 5 – 20°C
Ans. 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
Ans. C
24. Selective passage across a semipermeable membrane is called ______
(A) Osmosis
(B) Diffusion
(C) Both A and B
(D) Imbibition
Ans. 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
Ans. 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
Ans. 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
Ans. B
28. Which plant hormone is associated with closing of stomata?
(A) IBA
(B) GA
(C) ABA
(D) All of the above
Ans. C
29. Which enzyme plays major role in opening and closing of stomata?
(A) Beta-amylase
(B) Pyruvic kinase
(C) RuDP
(D) PEP carboxylase
Ans. 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
Ans. B
31. The highest root pressure exhibit in plants is _________
(A) 4 bars
(B) 15 bars
(C) 10 bars
(D) None of the above
Ans. B
32. Which nutrient is obtained by insectivorous plants from insect bodies?
(A) P
(B) K
(C) N
(D) Na
Ans. C
33. In Himalayan forest commonly N2 fixing bacteria is _____
(A) Azotobacter
(B) Frankia
(C) Nitrobacter
(D) None of the above
Ans. B
34. The enzyme responsible for atmospheric nitrogen fixation is _____
(A) Nitrogenase
(B) Amylase
(C) Nitrogenase and Amylase
(D) Lemda nitrogenage
Ans. 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
Ans. A
36. The most effective cofactor for enzyme is ______
(A) Mn
(B) Na
(C) K
(D) Ca
Ans. C
37. Flowering plants adapted to absorb which ions
(A) NO3–
(B) NO3+2
(C) NH3
(D) NO2
Ans. A
38. Bidirectional translocation of minerals occurs in plants
(A) Phloem
(B) Xylem
(C) Cambium
(D) Perenchyma and phloem
Ans. A
39. Nodule formation of legume roots is reduced during deficiency of _____
(A) S and B
(B) N
(C) K
(D) CI
Ans. A
40. Boron help in _________
(A) Photosynthesis
(B) Sugar transport
(C) Acting as a co-factors
(D) Both A and C
Ans. B
41. Nitrification process is done by _____
(A) Rhizobium
(B) B. bassiana
(C) Pseudomonas
(D) Nitrococcus
Ans. A
42. Transpiration mostly affected by _____
(A) Humidity
(B) Temperature
(C) Light
(D) Wind
Ans. 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
Ans. A
44. In plants stomatal movement is known as ______
(A) Nastic movement
(B) Physiotactic movement
(C) Geotactic movement
(D) Phototaxic movement
Ans. A
45. Which enzyme is not proteinaceous in nature?
(A) Ribozyme
(B) Both A and B
(C) Isozyme
(D) Trypsin
Ans. 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
Ans. B
47. Phosphofructokinase major enzyme in glycolysis is inhibited by _________
(A) ATP
(B) ADP
(C) Citrate
(D) Both A and C
Ans. D
48. Pyruvate dehydrogenease complex and glycolytic pathway is located in __________
(A) Cytosol and Mitochondria
(B) Cytosol
(C) Golgi bodies
(D) Microsomes
Ans. A
49. Which is responsible for Acetyl CoA carboxylase activation
(A) Citrate and insulin
(B) Isozyme
(C) Trypsin
(D) All of the above
Ans. A
50. Most C4 plants are native _____
(A) Xerix habitats
(B) Merine habitats
(C) Grass habitats
(D) All habitats
Ans. A
51. Photosynthetic yield will be maximum in ________
(A) Intermittent white light
(B) Continuous blue light
(C) Red light
(D) Yellow light
Ans. A
52. Photosynthetically active radiation wavelength ranging from ______
(A) 340 – 450
(B) 200 – 300
(C) 400 – 700
(D) 640 – 650
Ans. 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
Ans. A
54. Hill reaction take place in Granna formed
(A) ATP and NADPH2 both
(B) NADPH2
(C) ADP
(D) All of the above
Ans. A
55. Photosynthesis is most active and fast in _______
(A) Blue light
(B) White light
(C) Red light
(D) UV light
Ans. C
56. Which is immediate electron donor to PS-I
(A) Plastocyanin
(B) Plastometheonin
(C) Ferredoxinin
(D) Both B and C
Ans. A
57. Anabolic process is _____
(A) Photosynthesis
(B) Transpiration
(C) Both A and B
(D) None of the above
Ans. 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
Ans. 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
Ans. B
60. Dark reaction of photosynthesis occurs in ______
(A) Stomata
(B) Stroma and matrix
(C) Stroma
(D) Granna
Ans. C
61. In C4 plants first CO2 acceptor is _________
(A) Oxaloacetic acid
(B) Phosphoenol-pyruvate
(C) Oxalo butaric acid
(D) Pyruvic acid
Ans. B
62. Kranz anatomy found in ______
(A) Leaves
(B) Stem
(C) Flower
(D) Seed
Ans. C
63. Calvin cycle involves reductive carboxylation occurs in ________
(A) Chloroplast
(B) Cytochrom
(C) Peroxisome
(D) Cytoplasm
Ans. A
64. RUBISCO content of chlorophyll is _________
(A) 10%
(B) 15%
(C) 5%
(D) 7%
Ans. C
65. Dye used in Hill reaction by Stephan Hill
(A) Methylene blue
(B) Erosine
(C) Sulphure green
(D) Both A and B
Ans. 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
Ans. A
67. At which time acid concentration in CAM plants is maximum
(A) Dusk
(B) Down
(C) Night
(D) Day
Ans. B
68. During photosynthesis which element is essential for photolysis of water?
(A) Co
(B) C
(C) Cl
(D) N
Ans. C
69. Respiratory quotient (R.Q.) is less than one when the respiratory substrate is ______
(A) Sucrose
(B) Fat
(C) Glucose
(D) Fructose
Ans. B
70. Number of ATP produced from one pyruvic acid during conversion of acetyl CoA is _____
(A) 5
(B) 10
(C) 3
(D) 1
Ans. C
71. During aerobic respiration net number of water molecules produced per molecule of glucose is ______
(A) 6
(B) 5
(C) 4
(D) 8
Ans. A
72. Net ATP molecules formed in glycolysis is ______
(A) 38
(B) 12
(C) 2
(D) 1
Ans. C
73. One NADH2 produce number of ATP is ______
(A) 6 ATP
(B) 1 ATP
(C) 38 ATP
(D) 3 ATP
Ans. D
74. Glycolysis takes place in cytoplasm and the end product is ______
(A) Pyruvic acid
(B) Oxylic acid
(C) Glucose
(D) 30 ATP
Ans. 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
Ans. 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
Ans. 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
Ans. 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
Ans. 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
Ans. 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
Ans. A
81. Common precursor in CAM, UMP and TMP is ________
(A) Aspartate
(B) Glutamine
(C) Glutamate
(D) Adenosine
Ans. 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
Ans. B
83. The natural occurring in higher plant is _________
(A) IAA
(B) IBA
(C) NAA
(D) IBA and NAA
Ans. A
84. Dwarfness of the plant can be control by _____
(A) IAA
(B) MH
(C) GA
(D) IBA
Ans. C
85. Polar translocation of plant hormone found in ______
(A) Auxin
(B) GA
(C) Cytokinin
(D) Zeatin
Ans. A
86. An essential growth substance required in tissue culture and delay the chlorophyll loss
(A) GA
(B) Kinetin
(C) Cytokinin
(D) Auxin
Ans. C
87. Tress hormone is ______
(A) GA
(B) IAA
(C) ABA
(D) Both A and B
Ans. 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
Ans. 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
Ans. A
90. Hormone involve in phototropism is _________
(A) IAA
(B) GA
(C) Kinetin
(D) Cytokinin
Ans. A