InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Cytokinin synthesis is maximum inA. Roots B. Leaves C. Shoot tip D. Fruit |
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Answer» Correct Answer - A Cytokinins synthesis is maximum is roots. |
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| 52. |
High concentration of auxin is present inA. Rootapex B. Shootapex C. Petiole D. Node |
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Answer» Correct Answer - B High concentration of auxin is present in shoot apex. |
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| 53. |
The following is a dnaturally occring growth inhibitorsA. IAAB. ABAC. NAAD. GA |
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Answer» Correct Answer - b Because IAA,NAA and GA are growth promoters and ABA is growth inhibitor. |
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| 54. |
The PGR, ethylene, could fit either the groups-plant growth promoters and inhibitors but it is largely an A. Promoter of growth activities B. Inhibitor of growth activities C. Supporter of growth activities D. Inducer of growth activities |
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Answer» Correct Answer - B The PGR, ethylene, could fit either the groups-plant growth promoters and inhibitors but it is largely an inhibitor of growth activities |
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| 55. |
Functions of plant growth promoters and plant growth inhibitros are given here in a jumbled up manner. Select the option that correctly segregates these functions. (i) Cell division (ii) Cell enlargement (iii) Pattern formation (iv) Tropic growth (v) Flowering (vi) Fruiting (viii) Seed germination (viii) Response to wounding (ix) Response to stresses of biotic and abiotic origin (x) DormancyA. `{:("Functions of growth promoters","functions of growth inhibitors"),((i).(ii).(vii).(ix),(ii).(iv).(v).(vi).(viii).(x)):}`B. `{:("Functions of growth promoters","functions of growth inhibitors"),((viii).(ix).(x),(i).(ii).(iii).(iv).(v).(vi).(vii)):}`C. `{:("Functions of growth promoters","functions of growth inhibitors"),((i).(ii)(iii).(iv)(v).(vi).(vii),(viii).(ix).(x)):}`D. `{:("Functions of growth promoters","functions of growth inhibitors"),((i).(ii)(iii).(iv)(v).(vi).(vii).(ix).(x),(viii)):}` |
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Answer» Correct Answer - C Plant Growth Hormones (PGRs) or phytohormones are the organic substances which are synthesied in minute quantities in one part of the plant body and transported to another part where they influence specific physiological process (Went and Thimann, 1937). PGRs are broadly divided into two groups-plant growth promoters and plant growth inhibitirs. Plant growth promoters perform growth promoting activities like cell divisions cell enlargement, pattern formation tropic growth, flowering, fruiting and seed formation. They are three in number viz, auxins gibberellins and cytokinins. plant growth inhibitor have important functions in inducing plant responses to wounding, biotic and abiotic stresses, dormancy and abscission. Abscisic acid is know as plant growth dormancy and abscission. Abscisis acid is known as plant growth inhibitor. Ethylene is largely plant growth inhibitor but is also involved in some growth promotion activities. |
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| 56. |
Biennials get changed into annuals byA. Hormones B. Photoperiodism C. Grafting D. Vemalisation |
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Answer» Correct Answer - D Biennials get changed into annuals by vernalisation |
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| 57. |
Example of positive geotropism isA. Closing of flowers B. Upward growth of stem C. Downward growth of rootD. Lateral growth of root |
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Answer» Correct Answer - C Example of positive geotropism is downward growth of root. |
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| 58. |
The response of different organisms to environmental rhythms of light and darkness is called:A. Photoperiodism B. Phototropism C. Phototaxis D. Vernalisation |
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Answer» Correct Answer - A Environmental rhythms of light and darkness produce photoperiodism |
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| 59. |
The respone of different orgnisms to the environmental rhythms f light and darkness is called Or The effect of daiy period on flowwering is caledA. PhotoaxisB. toto ropismC. VernaliztionD. Photoerodsm |
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Answer» Correct Answer - d (d) Photoperiodism is the term to denote the biological response to changes in the ratio of light and darkness in a 24 cycle |
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| 60. |
What part of plant perceives light for flowering ? |
| Answer» Correct Answer - Leaf | |
| 61. |
Certain plants will flower only when they are exposed to low tempeature for a few weeks. What do you call for this requirement ? |
| Answer» Correct Answer - Vernalization | |
| 62. |
The pigment which mainly absorbs red and far-red radiation in plants, is known asA. xanthophyllB. cytochromeC. phytochromeD. carotene |
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Answer» Correct Answer - C Phytochrome is a type of pigment which absorbs red or far-red light and its absorbing region is closely associated with protein. The phytochrome pigment is found to be present m two photoreversible forms `P_(r)(P_(660)and P_(tr)(P_(730))` `underset(("inative"))(P_(r))overset("Red light")underset(Far red)hArrunderset(("active"))(P_(f r))` |
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| 63. |
The response of different organisms to environmental rhythms of light and darkness is called:A. phototaxisB. photoperiodismC. phototropismD. vernalistation |
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Answer» Correct Answer - B Photoperiodism is the term to denote a biological response to changes in the ratio of hght and darkness in a 24 hrs cycle |
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| 64. |
Which of the following effects of auxins on plants is the basis for their commercial application?A. Cellus formationB. Curvature of stemC. Induction of root formation in stem cuttingsD. Induction of shoot formation |
| Answer» Correct Answer - C | |
| 65. |
Which of the following effects of auxins on plants is the basis for commercial applicationA. Callus formationB. Curvature of stemC. Inducation of root formation instem cuttingD. All of the these |
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Answer» Correct Answer - d |
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| 66. |
Chrysanthemum flowers either in winter season or in evening because it is aA. Short-day plantB. Long-day plantC. Day-neutral plantD. Mid-day plant |
| Answer» Correct Answer - a | |
| 67. |
A plant hormone used for inducing morphogenesis in plant tissure is OR Folr plant tissue culture among the following which one is requiredA. gibberellinesB. cytokininsC. ethyleneD. abscisis acid |
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Answer» Correct Answer - B Ratio of cytokinin to auxin controls cell differentiation. If there is more cytokmm than auxm, shoot buds develop. Relatively more auxin than cytokinins leads to the development of roots Abscisic Acid (ABA) is known as natural plant growth inhibitor. Gibberellin . stimulates stem elongation, leaf expansion, boltmg, flowermg, etc. Ethylene is a fruit npening hormone |
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| 68. |
A plant hormone used for inducing morphogenesis in plant tissure is OR Folr plant tissue culture among the following which one is requiredA. Abscissic acidB. GibberellinsC. CytokininsD. Ethylene |
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Answer» Correct Answer - c Ctytokin is a plant hormone which plays a part in organ formation with auxin. |
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| 69. |
Self life of vegetabies and out flowers can be increased by commercial application ofA. CytokininB. AMO1618C. CyclocelD. Phosphon-D |
| Answer» Correct Answer - A | |
| 70. |
The number of female flowers can be increased by the application ofA. IAAB. `C_(2)H_(4)`C. CkD. All of these |
| Answer» Correct Answer - D | |
| 71. |
The phytohormone combination which is the key regulator of cell differentiation and morphogenesis isA. Cytokinin and IAAB. IAA and ABAC. IAA and `GA_(3)`D. Cytokinin and gibberellin |
| Answer» Correct Answer - A | |
| 72. |
The dedifferentiated cells mature to form some specific cells to perform specific functions, this is referred to asA. differentiationB. dedifferentiationC. redifferentitationD. development |
| Answer» Correct Answer - C | |
| 73. |
Cytokinin are said to be antiageing hormone because they delay the senescence byA. Controlling mobilisation of resourcesB. Controlling protein synthesisC. Decreased morphogenisis and high respirationD. Both 1 & 2 |
| Answer» Correct Answer - D | |
| 74. |
Vascular cambium and cork cambium areA. lateral meristemsB. intercalary meristemsC. primary meristemsD. apical meristems. |
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Answer» Correct Answer - A The lateral meristems e.g., vascualr cambium and cork cambium (in dicotyledons and gymnosperms) are the meristems that cause increase in girth of the organs in which that are active. This is known as secondary growth of the plant. |
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| 75. |
lnterfaeciculnr cambium and cork cambium are able to divide and produce cells that once again lose the capacity to divide but mature to perform speciftc function. This phenomenon is called A. DifferentiationB. DedifferentiationC. Redifferentiation D. Heterophylly |
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Answer» Correct Answer - C Interfascicular cambium and cork cambium are able to divide and produce cells that once again lose the capacity to divide but mature to perform specific function. This phenomenon is called redifferentiation. |
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| 76. |
Hormone responsible for senescenceA. ABAB. AuxinC. GAD. Cytokinin |
| Answer» Correct Answer - A | |
| 77. |
Senescence isA. Terminal irreversible phase of ageingB. Combined deteriorative processes in mature plantC. A period between complete maturity and final death of an organD. All of these |
| Answer» Correct Answer - B | |
| 78. |
Abscission zone is characterized byA. Presence of callose plugsB. Presence of a distinct layerC. Activity of celluloses and pectinasesD. All of these |
| Answer» Correct Answer - A | |
| 79. |
In the process of apical dominance, lateral buds are unable to grow in the presence of apical bud. This is due toA. less amount of auxin in apical budB. more amount of auxin in apical budC. less amount of cytokinins in lateral buds.D. more amount of cytokinins in lateral buds. |
| Answer» Correct Answer - B | |
| 80. |
Shoot or top senescence occurs inA. RiceB. GladiolusC. MangoD. Dalbergia |
| Answer» Correct Answer - B | |
| 81. |
The cells derived from root apical and Shoot apical a meristems and cambium diiferentiate and mature to perform specific funcitons. This act leading to mature is termed asA. Differentiation B. De-DifferentiationC. RedifferentiationD. hetrophily |
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Answer» Correct Answer - A The cells derived from root apical and shoot apical idmeristems and cambium differentiate and mature to perform specific functions. This act leading to maturation is termed as differentiation. |
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| 82. |
Senescence as an active devlopmental cellular process in the growth and functioning of a flowering plant, is indicated inA. Annual plantsB. Floral partsC. Vessels and trachieid differentiationD. Leaf abscission |
| Answer» Correct Answer - d | |
| 83. |
Assertion : Auxillary buds, in actively growing herbaceous plants, generally remain dormant Reason :This is due to apical dominance which is under the influence of auxinsA. If both Assetion and Reason are true and the Reason is a correct explanation of the AssertionB. If both Assertion and Reason are true but Reason is not a correct explanation of the AssertionC. If Assertion is true but the Reason is falseD. If both Assertion and Reaon are false |
| Answer» Correct Answer - A | |
| 84. |
Assertion : Senescence occurs in all non-meristematic cells Reason :Meristems are potentially immortal.A. If both Assetion and Reason are true and the Reason is a correct explanation of the AssertionB. If both Assertion and Reason are true but Reason is not a correct explanation of the AssertionC. If Assertion is true but the Reason is falseD. If both Assertion and Reaon are false |
| Answer» Correct Answer - A | |
| 85. |
Plant growth substancees (PGS) have innumerable practical applications. Name the PGS you should use to (a) Increase yield of sugarcame (b) Promote lateral shoot growth (c) Cause sprouting of potato tuber (d) inhibit seed germination |
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Answer» (a) GA 3/Gibberellin (b) Cytokinin (c) Ethylene (d) Abscissic acid (ABA) |
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| 86. |
Write the characteristics of cells which are proximal to the meristematic zone. |
| Answer» Correct Answer - Increased vacuolation cell enlrgemetn New cell wall deposition | |
| 87. |
Pruning of plants promotes branchin becaues the axillary buds get sensitized toA. 1AA B. Ethylene C. Gibberellin D. Cytokinin |
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Answer» Correct Answer - A Pruning of plants promotes branching due to senitisation of axillary buds by IAA |
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| 88. |
Pruning of plants promotes branchin becaues the axillary buds get sensitized toA. ethyleneB. gibberellinC. cytokininD. indole acetic acid |
| Answer» Correct Answer - C | |
| 89. |
Pruning of tea plants is done discard the effect ofA. `GA_(3)`B. AuxinC. CytokininD. ABA |
| Answer» Correct Answer - B | |
| 90. |
Bolting, i.e. internode elongation just prior to flowering in beet, cabbage and many rosette plants, is promoted byA. auxinsB. gibberellinsC. cytokininsD. ethylene |
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Answer» Correct Answer - B Certain plants show profuse leaf development but reduced internode growth. Such form of growth is called rosette, where a large number of broad leaves remain attached to a very short axis. Such plants exhibit excessive internode growth just before reproduction, the axis elongates 5-6 times the original height of plant and starts flowering. Stimulation in the internode growth just before reproduction is called bolting. if such plants are treated with gibberellins during conditions of rosette growth, the plants bolt and flower. Normally, bolting is favoured in nature by either cold nights or long days. |
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| 91. |
Synthetic auxins are employed forA. Ripening of fruits B. Increasing size of fruits C. Killing weeds D. Preventing elongation of intemode |
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Answer» Correct Answer - C Synthesis auxins (like 2,4-D) are empolyed for killing weeds. |
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| 92. |
Name two synthetic auxins. How are they applied in agriculture ? |
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Answer» The two synthetic auxins are- (i) Indole-3-butyric acid (IBA) and (ii) 2, 4-dichlorophenoxy acetic acid (2, 4-D). Indole-3-butyric acid is used to induce formation of roots on cuttings of many ornamental, horticultural and forest trees. 2, 4-D is used as weedicide. |
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| 93. |
Cholodny-Went theory is connected withA. phototropismB. PhotomorphogenesisC. PhotorespirationD. Photosynthesis |
| Answer» Correct Answer - B | |
| 94. |
Gibbane ring skeleton in structure and production of hydrolytic enzymes in barley endosperm is a characteristic ofA. CytokininB. AuxinsC. GibberellinsD. Ethylene |
| Answer» Correct Answer - C | |
| 95. |
What is meant by bioassay ? Name any two bioassays for auxins. |
| Answer» Quantitative estimation of biologically active substances by measurement of their activity on living organism or their part is called bioassay. Avena curvatre test and root growth inhibition test are the bioassays for examining auxin activity. | |
| 96. |
Avena curvature test and dwarf maize test are bioassays of, respectively,A. Auxins and gibberellinsB. GA and CKC. Auxins and CKD. IA A and ethylene |
| Answer» Correct Answer - A | |
| 97. |
Avena coleoptilre test detects the presence ofA. IAAB. GAC. NAAD. BA |
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Answer» Correct Answer - a (a) Avena curature test carried out by F.W Went demonstrated the effect of auxins onnplants growth by performing some expermentes with the oat (averna sativa ) coleoptille IAA is the natural auxin |
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| 98. |
Avena coleoptilre test detects the presence ofA. ABA B. `GA_(3)` C. 1AA D. Ethylene |
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Answer» Correct Answer - C The Avena curvature is used for bioassay of IAA. |
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| 99. |
Apples are generally wrapped in waxed paper toA. prevent sunlight for changing its colourB. prevent aerobic respiration by checking the entry of `O_2`C. prevent ethylene formation due to injuryD. make the apples look attractive |
| Answer» Correct Answer - b | |
| 100. |
Apples are generally wrapped in waxed paper toA. Prevent sunlight for changing its colourB. Prevent aerobic respiration by respiration by checking the entry of `O_(2)`C. Prevent ethylene formation due to injuryD. Make the apples look attractive |
| Answer» Correct Answer - b | |