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.
| 1. |
The PGRs which play an important role in plant responses to wound and stresses of biotic and abiotic origin and also involved in various growth inhibiting activities such as dormancy and abscission, is/are A. ABA B. EthyleneC. Auxin, cytokinin and GA D. ABA and ethylene |
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Answer» Correct Answer - D The PGRS which play an important role in plant responses to wound and stresses of biotic and abiotic origin and also involved in various growth inhibiting activities such as dormancy and abscission, are ABA and ethylene. |
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| 2. |
The site of perception of light/dark duration are the____ |
| Answer» Correct Answer - leaves | |
| 3. |
What is the site of perception of light/dark for flowering in plants? |
| Answer» Correct Answer - Leaves | |
| 4. |
The substance which have proved very effective to induce rooting from cut end of the stem is Or Abscission of fruit is prevented byA. Phenyl acetic acidB. `alpha` - naphthalene acetic acidC. Indole acetic acidD. Indole butyric growth |
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Answer» Correct Answer - d (d) many new plant s aare usually propapageted by stem cutiing .If we dip to the lower cut end of cutting in dilute solution of auxins (especiallt IBA) very soon large number of roots are developed on the cut ends due to which these cutting develop into successfull plants |
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| 5. |
Expand GA |
| Answer» Correct Answer - Gibberellin acid | |
| 6. |
Tracheilds do not collapse under extreme tension due to the presence ofA. Strong, elastic lignocellulosic secondary cell wallB. Thick, cellulosic primary cell wallC. Thin, elastic, cellulosic primary cell wallD. Thick, hard suberised secondary cell wall |
| Answer» Correct Answer - A | |
| 7. |
Which auxins are used in induce root formation on stem cuttings? |
| Answer» Correct Answer - NAA and IBA | |
| 8. |
Which factor determines the direction of movement of main root and stem?A. OxygenB. GravityC. TemperatureD. Nutrients |
| Answer» Correct Answer - B | |
| 9. |
Plant cutting are dipped in a solution and then planted in nursery beds to fasten the rooting, What there in the solution and what function it plays in the initiation of roots ? |
| Answer» The solution contains an artificial auxin -Indole butyric acid (IBA). This auxin causes initiation of new roots from the cut end. | |
| 10. |
Which of the following hormones is used in root formation on stem cutting?A. KinetinB. GAC. ABAD. IBA |
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Answer» Correct Answer - D Auxins stimulate root formation on the stem cuttings, e.g. IBA, IBA-alanine, NA A, NA A is synthetic auxin while IBA is considered as both natural and synthetic. |
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| 11. |
Spraying sugarcane with gibberellins increases the yield by as much as 20 tonnes per acre. GA performs it byA. inproving the quality of fruitB. increasinf sugar contentC. Internodal elongationD. delaying senescence. |
| Answer» Correct Answer - C | |
| 12. |
One harmone is used to speed up the malting process in barely, another is used to promote flowering in pineapple, while the third helps in the delay of leaf senescence. These are respectivelyA. Auxin, Gibberellin and Cytokinin B. Gibberellin, Cytokinin, Auxin C. Gibberellin, Auxin, Cytokinin D. Cytokinin, Auxin, Gibberellin |
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Answer» Correct Answer - C Hormones used to speed up malting in Barley, promote lowering. Pineapple and delaying leaf senescence are glbberellin, auxin and cytokinin respectively |
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| 13. |
Why is Abscisic acid also known as stress hormone? |
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Answer» Abscisic acid is called stress hormones as it induces various responses in plants against stress conditions. It increases the tolerance of plants toward various stresses. It induces the closure of the stomata during water stress. It promotes seed dormancy and ensures seed germination during favourable conditions. It helps seeds withstand desiccation. It also helps in inducing dormancy in plants at the end of the growing season and promotes abscission of leaves, fruits, and flowers. |
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| 14. |
Which one hastens flowering in plantsA. Stratification B. Scariiication C. Vemalisation D. Water deficit |
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Answer» Correct Answer - C Vemalisation hastens flowering in plants |
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| 15. |
Which is not true for abscisic acid?A. Acts as antitranspirantB. Synthesized in chloroplast from carotenoidsC. Increases stress tolerance in plantsD. Induce epinasty of leaves and flowers |
| Answer» Correct Answer - D | |
| 16. |
The phenomenon which shortens vegetative period and hastens flowering isA. Etiolation B. Vemalisation C. Photoperiodism D. Parthenocarpy |
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Answer» Correct Answer - B The phenomenon which shortens vegetative period and hastens flowering is vemalisation |
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| 17. |
Abscisic acid is called stress hormone as itA. Induces flowering B. Breaks seed dormancy C. Promotes leaf fall D. Promotes stomatal closure |
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Answer» Correct Answer - D Abscisic acid is called stress hormone as it promotes stomatal closure |
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| 18. |
Which growth regulators is used to prepare weed-free lawns by the gardeners?A. Indole-S-acetic acid B. Indole butyric acid C. 2, 4-dichlorophenoxy acetic acid D. Naphthalene acetic acid |
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Answer» Correct Answer - C 2,4-dichlorophenoxy acetic acid (2, 4-D) is used to prepare weed-free lawns by the gardeners |
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| 19. |
Write the process that result in the growth of lateral buds and widely applied in tea plantations and hedge making. |
| Answer» Correct Answer - Decapitation | |
| 20. |
In tea plantations and hedge making, gardeners trim the plants regularly so that they remain bushy. Scientific explanation behind this isA. removal of apical dominanceB. growth of lateral budsC. suppression of lateral budsD. both (a) and (b) |
| Answer» Correct Answer - D | |
| 21. |
In botanical gardens and tea gardens, gardeners trim the plants regularly so that they remain bushy. Does this practice have any scientific explanation. |
| Answer» Yes, to keep the plants bushy to increase the yield of tea leaves in tea gardens and flowes in botanical gardens because trimming results in the activiation of lateral buds grow due to elimination of naturally occuring apical dominance in plants. | |
| 22. |
Antherozoids are attracted towards archegonia in fern plant. The phenomenon isA. Nyctinasty B. Chemonasty C. Thigmonasty D. Seismonasty |
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Answer» Correct Answer - B Antherozoids are attracted towards archegonia in a fern plant. This phenomenon is chemonasty |
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| 23. |
Assertion : Vernalisation is the promotion of flowering by a period of low temperature. Reason : It prevents precocious reproductive development late in the growing season.A. If both assertion and reason are true and reason is the correct explanation of assertionB. If both assertion and reason are true but reason is not the correct explanation of assertionC. If assertion is true but reason is falseD. If both assertion and reason are false |
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Answer» Correct Answer - b There are plants for which flowering is either quantitatively or qualitatively dependent on exposure to low temperature. This treatemet is termed as vernalisation. It prevents precocious reproductive development late in the growing season, and enables the plant to have sufficient time to reach maturity. |
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| 24. |
Living differentiated cells which have otherwise lost the capacity to divide, can region the power of division under certain conditions. This phenomenon is termed asA. Differentiation B. Dedifferentiation C. Redifferemiation D. Heterophylly |
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Answer» Correct Answer - B The living differentiated cells,that by now have lost the capacity to divide can regain the capacity of di- vision under certain conditions. This phenomenon is termed as |
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| 25. |
Living differentiated cells which have otherwise lost the capacity to divide, can region the power of division under certain conditions. This phenomenon is termed asA. differentiationB. dedifferentiationC. redifferentitationD. development |
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Answer» Correct Answer - B The living differentiated cells, that have lost the capacity to divide can regain the power of division under certain conditions, this phenomenon is termed as de-differentiation. E.g. formation of meristems-interfascicular combium (formed form outer layer of cortex) from fully differentiated parencyma cells. while doing so, such meristems/tissues are able to divide and produce cells that once again lose the capacity to divide but mature to perform specific functions, i.e., get redifferentiated. E.g., cells of secondary xylem, secondary phloem, periderm. Thus redifferentiation can be defined as maturation or differentiation of dedifferentiated tissues. |
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| 26. |
Select the correct option regarding the phytohormone to which the given molecualar structure belongs. A. The hormone promotes femaleness in most flowers.B. The hormone promotes apical domiance.C. The hormone usually decreases the size of stem, leaves, flowes and fruitsD. The hormones breaks seed dormancy by synthesis of certain enzymes. |
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Answer» Correct Answer - d Given molecular sturcture belongs to hormone gibberellic acid (GA). Gibberellic acid (GA) breaks the dormancy of several types of seeds. One biochemical reaction known to be enhanced GA is the synthesis of hydrolase enzyme (especially-`alpha`-amylase) in the endosperm of cereal grains e.g., barley. |
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| 27. |
Curling of tendrils is due toA. thigmotropismB. phototropismC. chemotropismD. nyctinasty |
| Answer» Correct Answer - A | |
| 28. |
Growth can be measured in various ways. Which of these can be used as parameters to measure growth?A. Increase in cell numberB. Increase in cell sizeC. Increase in length and weightD. All the above |
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Answer» Correct Answer - d Growth at a cellular level, is principally a consequence of increase in the amount of protoplasm. Growth is, measured by a variety of parameters such as (i) Increase in legth, e.g., stem, root, pollen tube. (ii) Increase in volumne e.g., fruits. (iii) Increase in area, e.g., leaves (iv) Increase in diameter, e.g., tree trunks, fruits (v) Increase in fresh or dry weight. One single maize root apical meristem can give rise to more than 17,500 new cells per hour, whereas cells in a watermelon may increase in size by upto 3,50,000 times. In the former, growth is expressed as increase in cell number, the latter expresses growth as increase in size of the cell. |
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| 29. |
What is an open form of growth ? |
| Answer» The continued growth due to which new cells are always being added to the plant body by the activity of the meristem. | |
| 30. |
Write two parameters with the help of which growth can be measured. |
| Answer» Increase in length, increase in cell size, increase in fresh weight and dry weight, increase in surface area, increase in volume, increase in cell number. (any two) | |
| 31. |
The leaves, flowers and fruits of the same tree not only have limited dimensions but also appear and fall periodically and some time repeatedly. |
| Answer» Correct Answer - 1 | |
| 32. |
Which type of meristems are responsible for primary growth ? |
| Answer» Root apical meristem, shoot apical meristem. | |
| 33. |
Fill in the blanks : (A) ....is a simple gaseous hormone. (B) ....is shedding of leaves, fruits or flowers by a plant (C) Plant growth is generally confined to ....regions and in.......tissues. (D) Cytokinins are synthesized in areas where .... is occurings. (E) Auxins are generally produced by the growing apices of ....and ...... |
| Answer» (A) Ethylene (B) Abscission (C) apical, meristematic (D) cell division (E) stem, root | |
| 34. |
Which meristems are responsible for secondary growth in plants? |
| Answer» Lateral maristems such as vascular cambium and cork cambium. | |
| 35. |
What increases in plants during secondary growth? |
| Answer» Correct Answer - Girth or diameter | |
| 36. |
Secondary growth generally occurs inA. monocotsB. dicotsC. gymnospermsD. both (b) and (c) |
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Answer» Correct Answer - D Secondary growth occurs in both dicots and gymnosperms due to presence of laternal meristems. |
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| 37. |
Cytokinin helpsA. To retain chlorophyllB. In promoting cell divisionC. In overcoming apical dominanceD. More than one option is correct |
| Answer» Correct Answer - D | |
| 38. |
Bud dormancy is induced byA. I A AB. GAC. ABAD. ethylen |
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Answer» Correct Answer - C ABA is known as dormin as it induces dormancy in buds, underground stems and seeds in a variety of plants. e.g., ABA induces winter bud dormancy in duckweed plant. |
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| 39. |
Shoot bud formation is tissue culture is promoted byA. High auxin : Low CytokininB. Low Auxin : High CytokininC. Auxin : SucroseD. `GA_(3)` : Cytokinin |
| Answer» Correct Answer - B | |
| 40. |
Bud dormancy is induced byA. IAA B. GA C. ABA D. Ethylene |
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Answer» Correct Answer - C Bud dormancy is induced by ABA |
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| 41. |
Through their effect on plant growth regiulators, what do the temperature and light control in the plantsA. Apical dominanceB. FloweringC. Closure of stomataD. Fruit elongation |
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Answer» Correct Answer - b (b) Flowering is induced by light temperature. |
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| 42. |
Ethylene is used forA. Decreasing the senescenceB. Increasing the heights of stemC. Ripening of fruitsD. Prevention of leaf fall |
| Answer» Correct Answer - C | |
| 43. |
What induces parthenocarpy in grapes ? |
| Answer» Auxins induce parthenocarpy | |
| 44. |
Root development is promoted byA. Absic acidB. AuxinC. GibberellinD. Ethylene |
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Answer» Correct Answer - d (d) Root development and root hair formation `C_(2)H_(4)`. |
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| 45. |
Auxin suppresses growth ofA. Lateral axillary budsB. Apical buds C. Roots on stem cuttingsD. All of the above |
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Answer» Correct Answer - A Auxin suppresses growth of lateral axillary buds |
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| 46. |
Parthenocarpy can be achieved byA. Zeatin B. ABA C. Auxin D. Kinetin |
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Answer» Correct Answer - C Parthcnocarpy can be achieved by auxins. |
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| 47. |
Auxin synthesis occurs inA. Root/shoot tips B. Cortex C. Xylem D. Phloem |
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Answer» Correct Answer - A Auxins synthesis occurs in root/shoot tips. |
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| 48. |
Photoperiodic stimules is received byA. LeavesB. BudsC. MeristemD. Flowers |
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Answer» Correct Answer - a (a) Photoperiodic stimulas is percieved by mature/old leaves |
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| 49. |
Highest auxin concentration occursA. In growing tips B. In leaves C. At base of plant organs D. In xylem and phloem |
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Answer» Correct Answer - A Highest auxin concentration occurs in growing tip |
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| 50. |
Highest auxin concentration occursA. Root and shoot tipsB. Leaves and furitsC. Mid stem portionD. None of these |
| Answer» Correct Answer - A | |