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AZAD JAMMU & KASHMIR PUBLIC SERVICE COMMISSION

Lecturer Biology Test Paper#20

Total Marks: 100 Total Time: 100 Min

Test Date: 23-Jan-2025 Test Time: 9:00-10:40

Plant Physiology

Note: There are total one hundred MCQs according to AJKPSC Slybuss, every MCQ carries 1
marks. Choose the correct option from the MCQs and write it in the answer book on the last
page.
1. In rainy season the wooden doors are hard to close because of:
A) Osmosis B) Diffusion C) Imbibition D) All of these
2. The plant wilting occurs due to process of:
A) Endosmosis B) Exosmosis C) Diffusion D) Imbibition
3. Which of the following plants do not transpire?
A) Algae B) Fungi C) Submerged plants D) All of these
4. Gaseous exchange in submerged hydrophytes takes place through:
A) Lenticels B) Stomata C) Water stomata D) General surface of plants
5. Guttation occurs through:
A) Stomata B) Hydathodes C) Root hairs D) Flower buds
6. Transport of water takes place through:
A) Phloem B) Xylem C) Sieve tubes D) Sclerenchyma
7. Which of the following conducts sugar to different organs in plants:
A) Phloem fibers B) Parenchyma C) Sieve tubes D) Vessels
8. Translocation of carbohydrates occurs as:
A) Glucose B) Fructose C) Sucrose D) Maltose
9. Plants absorbs nitrogen in the form of:
A) Nitrites B) Nitrates C) N2 gas D) HNO
10. Which is not a micronutrient?
A) Zn B) Cu C) Ca D) Mo
11. The movement of ions against concentration gradient will be:
A) Active transport B) Diffusion C) Osmosis D) All of these
12. The term enzyme was coined by:
A) Kuhne B) Buchner C) Summer D) Pasteur
13. Enzymes are the polymers of:
A) Hexose carbon B) Fatty acids C) Amino acids D) None of these
14. At high temperature enzymes are:
A) Killed B) Highly effective C) Inactivated D) Denatured
15. When coenzyme combines with apoenzyme, it is called:
A) Co factor B) Holoenzyme C) Prosthetic group D) Isoenzyme
16. Which enzyme is used to disintegrate the prokaryotic cell wall?
A) Amylase B) Lipase C) Protease D) Lysozyme
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17. Thylakoids are not stacked in granum in:

A) Algae B) Bryophytes C) Angiosperms D) Gymnosperms

18. The splitting of water is associated with:

A) Photosystem I B) Photosystem II C) Calvin cycle D) Chemiosmosis
19. Calvin cycle occurs in:
A) Chloroplast B) Thylakoids C) Stroma D) None of these
20. Carbon dioxide is fixed in:
A) Light reaction B) Dark reaction C) Aerobic respiration D) None of these
21. The important component of chlorophyll molecule is:
A) Cl B) Cu C) Mg D) Fe
22. The most abundant protein on earth is:
A) Insulin B) RuBisCo C) Myoglobin D) Plastocyanin
23. Where the Dark reaction in photosynthesis takes place?
A) Grana B) Nucleus C) Vacuole D) Stroma
24. Photorespiration is the characteristics of:
A) C3 plants B) C4 plants C) CAM plants D) None of these
25. Photorespiration is also known as:
A) Glyoxylate B) C2 cycle C) Both a and b D) None of these
26. The enzyme that fixes atmospheric carbon dioxide in C4 plants is:
A) PEP Carboxylase B) RUBP Carboxylase C) RUBP oxygenase D) Hydrogenase
27. Dimorphic chloroplasts are found in leaves of:
A) C3 plants B) C4 plants C) Both a and b D) None of these
28. The specific characteristic of C4 plants is:
A) Bulliform cells B) Isobilateral C) Krantz anatomy D) Parallel veins
29. Which of the following enzymes has dual role?
A) PEP carboxylase B) RuBisCO C) Phosphorylase D) Aldolase
30. Carbon dioxide accepter in C3 plants is:
A) RuBP B) PGA C) PET D) None of these
31. The substrate for RuBisCO is:
A) RuBP B) Glycolate C) 3-PGA D) None of these
32. The first compound formed in photosynthesis of C3 plants is:
A) Phosphoglyceric acid B) Starch C) Pyruvic acid D) Ribulose diphosphate
33. The pyruvic acid formed in glycolysis is oxidized to CO2 and water in a cycle called;
A) Calvin cycle B) Hill reaction C) Kreb cycle D) Nitrogen cycle
34. Glycolysis is also called as:
A) EMP pathway B) Pentose phosphate pathway C) Kreb cycle D) All of these
35. The formation of pyruvate takes place in:
A) Mitochondria B) Cytoplasm C) Peroxisome D) Glyoxysome
36. Which of the following causes muscle fatigue?
A) Lactic acid B) Formic acid C) Pyruvic acid D) Citric acid
37. The first product of the Krebs cycle is:
A) Citrate B) Succinate C) Aconitate D) Oxaloacetate
38. ATP is:
A) Higher nucleotide B) Nucleoside C) Nucleic acid D) Vitamin
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39. The final acceptor of mitochondrial ETC is:

A) Molecular nitrogen B) Water C) Molecular oxygen D) Hydrogen peroxide
40. The site of EMP pathway is:
A) Cytosol B) mitochondria C) Granum D) Inner membrane

41. The connecting link between Glycolysis and Krebs cycle is:
A) Acetyl CoA B) Pyruvate C) Succinate D) Fumarate
42. The powerhouse of energy in cell is:
A) Golgi body B) Mitochondria C) Ribosomes D) ER
43. In human lactic acid fermentation occurs in:
A) Liver cells B) Kidney cells C) Stomach cells D) Muscle cells
44. Respiration is a:
A) Catabolic process B) Anabolic process C) Amphibolic process D) All of these
45. Which one is called amphibolic Cycle?
A) Calvin cycle B) Krebs cycle C) Glycolate cycle D) Glyoxylate cycle
46. Ripening of fruits can be accelerated by:
A) Ethylene B) Heating C) Nitrogen D) IAA
47. Which cause closure of stomata?
A) Cytokinin B) Auxin C) Gibberellin D) ABA
48. The pigment which absorbs red and far red light in plants is:
A) Xanthophyll B) Cytochrome C) Phytochrome D) Carotene
49. The first part to emerge from a germinating seed is the:
A) Radicle B) Stem tip C) Leaf primordia D) Hypocotyl
50. The phenomenon of apical dominance is caused by:
A) ABA B) Cytokinins C) Auxins D) None of these
51. In plants photoperiodic stimulus is perceived by:
A) Roots B) Stems C) Leaves D) None of these
52. Vernaline is a:
A) Floral hormone B) Inhibitor of flowering C) Fruit ripening hormone D) None
53. The term vernalization was first used in 1928 bt_______________.
A) Chailakhian B) Gassner C) Lysenko, D) Wrinkker
54. Transpiration is least in
A) good soil moisture (b) high wind velocity (c) dry environment (d) high atmospheric
humidity.
55. Phenyl mercuric acetate (PMA) results in
A) reduced photosynthesis (b) reduced transpiration (c) reduced respiration (d)
killing of plants.
56. Stomata open and close due to
A) circadian rhythm (b) genetic clock (c) pressure of gases inside the leaves
(d) turgor pressure of guard cells.
57. Movement of leaves of sensitive plant, Mimosa pudica are due to
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A) thermonasty (b) seismonasty (c) hydrotropism (d) chemonasty

58. Phytochrome is involved in
A) phototropism (b) photorespiration (c) photoperiodism (d) geotropism
59. Gibberellins promote
A) seed germination (b) seed dormancy (c) leaf fall (d) root elongation
60. Cut or excised leaves remain green for long if induced to root or dipped in

A) gibberellins (b) cytokinins (c) auxins (d) ethylene.

61. Hormone primarily connected with cell division is
A) IAA (b) NAA (c) cytokinin/zeatin (d) gibberellic acid
62. Carbon dioxide joins the photosynthetic pathway in
A) PS I (b) PS II (c) light reaction (d) dark reaction.
63. NADP+ is reduced to NADPH in
A) PS I (b) PS II (c) Calvin cycle (d) noncyclic photophosphorylation.
64. Minerals absorbed by root move to the leaf through
A) xylem (b) phloem (c) sieve tubes (d) none of the above
65. Phosphorous and nitrogen ions generally get depeleted in soil because they
usually occur as
A) neutral ions (b) negatively charged ions (c) positively charged ions
(d) both positively and negatively charged but disproportionate mixture.
66. Which one is an essential mineral, not constituent of any enzyme but stimulates
the activity of many enzymes
A) Zn (b) Mn (c) K (d) Mg
67. Which one increases in the absence of light?
A) uptake of minerals (b) uptake of water (c) elongation of internodes (d) ascent of
sap.
68. Leaf fall can be prevented with the help of
A) abscisic acid (b) auxins (c) florigen (d) cytokinins
69. Which of the following hormones can replace vernalisation?
A) auxin (b) cytokinin (c) gibberellins (d) ethylene.
70. The size of chlorophyll molecule is
A) head 15 x 15 A, tail 25 A (b) head 20 x 20 A, tail 25 A
(c) head 15 x 15 A, tail 20 A (d) head 10 x 12 A, tail 25 A.
71. The substrate for photorespiration is
A) phosphoglyceric acid (b) glycolate (b) serine (d) glycine
72. In C4 plants, Calvin cycle operates in
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A) stroma of bundle sheath chloroplasts (b) grana of bundle sheath chloroplasts

(c) grana of mesophyll chloroplasts (d) stroma of mesophyll chloroplasts.
73. Greatest producers of organic matter are
A) crop plants (b) forests (c) plants of the land are (d) phytoplankton of oceans.
74. A very efficient converter of solar energy with net productivity of 204 kg/m2 or
more is the crop
A) wheat (b) sugarcane (c) rice (d) bajra
75. A bottle filled with previously moistened mustard seeds and water was screw
capped tightly and kept in a corner. It blew up suddenly after about half an
hour. The phenomenon involved is
A) diffusion (b) imbibitions (c) osmosis (d) D.P.D.
76. The principal pathway of water translocation in angiosperms is
A) sieve cells (b) sieve tube elements (c) xylem vessel system (d) xylem and phloem.
77. Which of the following movement is not related to auxin level?
A) bending of shoot towards light (b) movement of root towards soil
(c) nyctinastic leaf movements (d) movement of sunflower head tracking the sun.
78. Phototropic and geotropic movements are linked to
(a) gibberellins (b) enzymes (c) auxin (d) cytokinins.
79. Abscisic acid controls
(a) cell division (b) leaf fall and dormancy
(c) shoot elongation (d) cell elongation and wall formation.
80. Phytohormones are
A) chemical regulation flowering (b) chemical regulation secondary growth C) hormones
regulating growth from seed to adulthood
D) regulators synthesised by plants and influencing physiological processes.
81. Highest auxin concentration occurs
(a) in growing tips (b) in leaves (c) at base of plant organs (d) in xylem and phloem.
82. Kranz anatomy is typical of
(a) C4 plants (b) C3 plants (c) C2 plants (d) CAM plants
83. The first carbon dioxide acceptor in C4-plants is
a. phosphoenol-pyruvate (b) ribulose 1, 5-diphosphate
(c) oxalo-acetic acid (d) phosphoglyceric acid
84. In soil, the water available for root absorption is
(a) gravitational water (b) capillary water (c) hygroscopic water (d) combined water
85. The most widely accepted theory for ascent of sap in trees is
(a) capillarity (b) role of atmospheric pressure (c) pulsating action of living cell
(d) transpiration pull and cohesion theory of Dixon and Jolly.
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86. Twining of tendrils is due to

(a) thigmotropism (b) seismonasty (c) heliotropism (d) diageotropism.
87. A chemical believed to be involved in flowering is
(a) gibberellins (b) kinetin (c) florigen (d) IBA.
88. The hormone responsible for apical dominance is
(a) IAA (b) GA (c) ABA (d) Florigen
89. Abscisic acid causes
(a) stomatal closure (b) leaf expansion (c) stem elongation (d) root elongation.
90. Photosynthetic pigments found in the chloroplasts occur in
(a) thylakoid membranes (b) plastoglobules (c) matrix(d) chloroplast envelope.
91. Dark reactions of photosynthesis occur in
(a) granal thylakoid membranes (b) stromal lamella membranes
(c) stroma outside photosynthetic lamellae (d) periplastidial space.
92. Which technique has helped in investigation of Calvin cycle?
(a) X-ray crystallography (b) X-ray technique (c) radioactive isotope technique
(d) intermittent light.
93. During monsoon, the rice crop of eastern states of India shows lesser yield
due to limiting factor of
(a) C02 (b) light (c) temperature (d) water.
94. Ferredoxin is a constituent of
(a) PS I (b) PS II (c) Hill reaction (d) P680
95. Water movement between cells is due to
(a) T.P. (b) W.P. (c) D.P.D. (d) incipient plasmolysis.
96. Which of the following is used to determine the rate of transpiration in plants?
(a) porometer/hygrometer (b) photometers (c) auxanometer (d) tensiometer/barometer
97. Guttation is mainly due to
(a) root pressure (b) osmosis (c) transpiration (d) imbibition.
98. In terrestrial habitats, temperature and rainfall conditions are influence by
(a) water transformations (b) transpiration (c) thermoperiodism (d) translocation.
99. Conversion of starch to organic acids is required for
(a) stomatal opening (b) stomata! Closing (c) stomatal formation (d) stomatal activity
100. At constant temperature, the rate of transpiration will be higher at
(a) sea level (b) 1 km below sea level (c) 1 km above sea level (d) 1.5 km above sea level
101. In guard cells when sugar is converted into starch, the stomatal pore
(a) closes completely (b) opens partially (c) opens fully (d) remains
unchanged
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102. Which is employed for artificial ripening of banana fruits?

(a) auxin (b) coumarin (c) ethylene (d) cytokinin.
103. Cytokinins
(a) promote abscission (b) influence water movement
c) photoperiod less than 12 hours photoperiod below a critical length and uninterrupted
long night long night
d) short photoperiod and interrupted long night.
104. Apical dominance is caused by
(a) abscisic acid in lateral bud (b) cytokinin in leaf tip
(c) gibberellin in lateral (d) auxin in shoot tip
105. Bananas can be prevented from over-ripening by
a. maintaining them at room temperature (b) refrigeration
(c) dipping in ascorbic acid solution (d) storing in a freezer.
106. Flowering dependent on cold treatment is
(a) cryotherapy (b) cryogenics (c) cryoscopy (d) vernalisation.
107. Dwarfness can be controlled by treating the plant with
(a) cytokinin (b) gibberellic acid (c) auxin (d) antigibberellin.
108.The enzyme that catalyses carbon dioxide fixation in C4 plants is
(a) RuBP carboxylase (b) PEP carboxylase
(c) Carbonic anhydrase (d) Carboxydismutase
109.Photosystem II occurs in
(a) stroma (b) cytochrome (c) grana (d) mitochondrial surface.
110.Chlorophyll a occurs in
(a) all photosynthetic autotrophs (b) in all higher plants
(c) help retain chlorophyll (d) inhibit protoplasmic streaming.
111.Which is produced during water stress that brings stomatal closure?
(a) ethylene (b) abscisic acid (c) ferulic acid (d) coumarin.
112.An adaptation for better gaseous exchange in plant leaves is
(a) hair on lower surface (b) multiple epidermis (c) waxy cuticle
(d) stomata on lower surface away from direct sun rays.
113.Klinostat is employed in the study of
(a) osmosis (b) growth movements (c) photosynthesis (d) respiration.
114.The hormone produced during adverse environmental conditions is
(a) benzyl aminopurine (b) bichlorophenoxy acetic acid
(c) ethylene (d) abscisic acid.
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115.The regulator which retards ageing/senescence of plant parts is

(a) cytokinin (b) auxin (c) gibberellins (d) abscisic acid.
116.Removal of apical bud results in
(a) formation of new apical bud (b) elongation of main stem (c) death of plant
(d) formation of lateral branching.
117.Translocation of carbohydrate nutrients usually occurs in the form of
(a) glucose (b) maltose (c) starch (d) sucrose.
118.Which one is a C4-plant?
(a) papaya (b) pea (c) potato (d) maize/corn
119.The carbon dioxide acceptor in Calvin cycle/ C3-plants is
(a) phospho-enol pyruvate (PEP) (b) ribulose 1, 5-diphosphate (RuBP)
(c) phosphoglyceric acid (PGA) (d) ribulose monophosphate (RMP)
120.Maximum solar energy is trapped by
(a) planting trees (b) cultivating crops (c) growing algae in tanks (d) growing grasses.
121.A photosynthesising plant is releasing l8O more than the normal. The plant must
have been supplied with
(a) O3 (b) H20 with CO2 (c) CO2 with 15O (d) C6H12O6 with 18O
122.Plants, but not animals, can convert fatty acids to sugars by a series of reactions
called
(a) photosynthesis (b) Kreb’s cycle (c) glycolysis (d) glyoxylate cycle.
123.During light reaction of photosynthesis, which of the following phenomenon is
observed during cyclic phosphorylation as well as non-cyclic phosphorylation?
(a) release of O2 (b) formation of ATP (c) formation of NADPH
(d) involvement of PS I and PS II pigment systems.
124.Which of the following pigments acts as a reaction- centre during photosynthesis?
(a) carotene (b) phytochrome (c) P700 (d) cytochrome.
125.If the growing plant is decapitated, then
(a) its growth stops (b) leaves become yellow and fall down
(c) axillary buds are inactivated (d) axillary buds are activated.
126.The movement of auxin is largely
(a) centripetal (b) basipetal (c) acropetal (d) both ‘a’ and ‘c’.
127.The 1992 Nobel Prize for medicine was awarded to Edmond H. Fischer and
Edwin J.Krebs for their work concerning
a) reversible protein phosphorylation as a biological regulation mechanism
b) isolation of the gene for a human disease
c) human genome project
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d) drug designing involving inhibition of DNA synthesis of the pathogen.

128.The closure of lid of pitcher in pitcher plant, is due to
(a) paratonic movement (b) autonomous movement (c) turgor movement (d) tropic
movement.
129.The movement of water, from one cell of cortex to adjacent one in roots, is due to
a) accumulation of inorganic salts in the cells
b) accumulation of organic compounds in the cells
c) water potential gradient
d) chemical potential gradient.
130.The C02 fixation during C4 pathway occurs in the chloroplast of
(a) guard cells (b) bundle sheath cells (c) mesophyll cells (d) spongy parenchyma
131.Which of the following element plays an important role in biological nitrogen
fixation?
a) copper (b) molybdenum (c) zinc (d) manganese
132.In C4 plants, CO2 fixation is done by
(a) sclerenchyma (b) chlorenchyma and hypodermis (c) mesophyll cells (d) guard cells.
133.Which one of the following elements is almost nonessential for plants?
a) Zn (b) Na (c) Ca (d) Mo
134.In C4 plants, CO2 combines with
A) phosphoenol pyruvate (b) phosphoglyceraldehyde
(c) phosphoglyceric acid (d) ribulose diphosphate.
135.When water enters in roots due to diffusion, is termed as
(a) osmosis (b) passive absorption (c) endocytosis (d) active absorption.
136.Photorespiration is favoured by
(a)high temperature and low O2 (b) high humidity and temperature
(c) high O2 and low CO2 (d) high CO2 and low O2
137.What will be the number of Calvin cycles to generate one molecule of hexose?
(a) 8 (b) 9 (c) 4 (d) 6
138.‘The law of limiting factors’ was proposed by
(a) Leibig (b) Hatch and Slack (c) Blackman (d) Arnon
139.The correct sequence of electron acceptor in ATP synthesis is
(a) Cyt. b, c, a3, a (b) Cyt. c, b, a, a3 (c) Cyt. o, a, b, c (d) Cyt. b, c, a, a3
140.Bidirectional translocation of solutes takes place in
(a) parenchyma (b) cambium (c) xylem (d) phloem.
141.Gibberellic acid induces flower
a) in short day plants under long day conditions
b) in day-neutral plants under dark conditions
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c) in some gymnospermic plants only

d) in long day plants under short day conditions.
142. If a tree flowers thrice in a year (Oct., Jan. and July) in Northern India, it is said
to be
a) photo and thermo-insensitive
b) photo and thermo-sensitive
c) photosensitive but thermo-insensitive
d) thermosensitive but photo-insensitive.
143.What will be the effect on phytochrome in a plant subjected to continuous red light?
a) phytochrome synthesis will increase
b) level of phytochrome will decrease
c) phytochrome will be destroyed
d) first (b) then (a).
144. With an increase in the turgidity of a cell, the wall pressure will be
(a) fluctuate (b) remain unchanged (c) increase (d) decrease
145.Which of the following is not caused by deficiency of mineral nutrition?
(a) etiolation (b) shortening of internode (c) necrosis (d) chlorosis.
146.When a cell is fully turgid, which of the following will be zero?
(a) turgor pressure (b) water potential (c) wall pressure (d) osmotic pressure
147.NADPH2 is generated through
(a) photosystem II (b) anaerobic respiration (c) glycolysis (d) photosystem I.
148.A pigment which absorbs red and far-red light is
(a) Cytochrome (b) xanthophylls (c) phytochrome (d) carotene
149.The core metal of chlorophyll is
(a) Ni (b) Cu (c) Fe (d) Mg
150. Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring II has one of
the following
(a) carboxylic group (b) magnesium (c) aldehyde group (d) methyl group
151.Which one among the following chemicals is used for causing defoliation of forest
trees?
(a) malic hydrazide (b) 2, 4-D (c) amo-1618 (d) phosphon D.
152. Phytochrome becomes active in
(a) red light (b) green light (c) blue light (d) none of these.

Regards:
Muhammad Sajid Kayani
Lecturer Botany HED
03435990893
 MSK Competitive Exam Preparation Lecturer Biology Test#20 By MSK

Answer key OF Lecturer Biology Test paper#20

BY MSK

1 C 21 C 41 A 61 C 81 A 101 A 121 B 141 D

2 B 22 B 42 B 62 D 82 B 102 C 122 D 142 A

3 D 23 D 43 D 63 D 83 A 103 C 123 D 143 D

4 D 24 A 44 A 64 A 84 B 104 D 124 C 144 C

5 B 25 B 45 B 65 B 85 D 105 C 125 D 145 A

6 B 26 A 46 A 66 C 86 A 106 D 126 B 146 B

7 C 27 B 47 D 67 C 87 C 107 B 127 A 147 D

8 C 28 C 48 C 68 D 88 A 108 B 128 A 148 C

9 B 29 B 49 A 69 C 89 A 109 C 129 C 149 D

10 C 30 A 50 C 70 C 90 A 110 C 130 C 150 D

11 A 31 A 51 C 71 B 91 C 111 B 131 B 151 B

12 A 32 A 52 A 72 A 92 C 112 B 132 C 152 D

13 C 33 C 53 C 73 D 93 B 113 D 133 B

14 D 34 A 54 D 74 B 94 A 114 A 134 A

15 B 35 B 55 B 75 B 95 C 115 D 135 B

16 D 36 A 56 D 76 C 96 B 116 D 136 C

17 A 37 A 57 B 77 C 97 A 117 D 137 D

18 B 38 A 58 C 78 C 98 B 118 D 138 C

19 C 39 C 59 A 79 B 99 A 119 B 139 D

20 B 40 A 60 B 80 D 100 D 120 C 140 D

Compiled and prepared by Muhammad Sajid kayani (Lecturer HED)

03435990893