InterviewSolution
Saved Bookmarks
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.
| 751. |
The discovery of each of the five major groups of PGRs (auxin, GA, cytokinin, ABA and ethylene) have been accidental. All this started with the observation ofA. F.W. Went B. E. KurosawaC. Skoog and MillerD. Charles Darwin and his son Francis Darwin |
|
Answer» Correct Answer - D The discovery of each of the five major groups of PGRS (auxin, GA, cytokinin, ABA and ethylene) have been accidental. All this started with the observation of Charles Darwin and his son Francis Darwin. |
|
| 752. |
Specific properrty attributed to gibberellins isA. Shortening of genetically tall plantsB. Elongation of genetically dwarf plantC. Promotion of rootingD. Yellowing leaves |
|
Answer» Correct Answer - b (b) Gibberellins are weakly cidic hormones having gibbane ring structure which cause cell elongation of intach plants in general and increases internodal length of genetically dqrfed plnts(i.e corn, pea) in particular . |
|
| 753. |
The hormone involved in metabolism of food matetial in cereal gain during germinations isA. AuxinB. CKNC. GAD. None of these |
|
Answer» Correct Answer - c (c ) GA hormone promotes RNA, protein and enzyme synthesis They hepls in germination process |
|
| 754. |
Match the following `{:(,A.,I"AA",i.,"Herring sperm DNA"),(,B.,ABA,ii.,"Bolting"),(,C.,"Ethylene",iii.,"Stomatal closure"),(,D.,GA,iv.,"Weed-free lawns"),(,E.,"Cytokinins",v.,"Ripening of fruits"):}`A. `(A) -(iv), (B)-(iii), (C)-(v), (D)-(ii), (E)-(i)`B. `(A)-(v),(B)-(iii), (C)-(iv), (D)-(ii), (E)-(i)`C. `(A)-(iv), (B)-(i), (C)-(iv), (D)-(iii), (E)-(ii)`D. `(A)-(v), (B)-(iii), (C)-(ii), (D)-(i), (E)-(iv)` |
| Answer» Correct Answer - A | |
| 755. |
What would be expected to happen if you forget to add cytokinin to the culture medium? A. There will be no differentiation of root B. There will be no ditferentiation of shootC. A callus will be produced D. Nothing would happen |
|
Answer» Correct Answer - B There will be no differentiation of shoot if you forget to add cytokinin to the culture medium |
|
| 756. |
Match the columns and find the correct combination : `{:(," I",," II"),(a,"Auxin",1.,"Herring sperm DNA"),(b,"Cytokinin",2,"Inhibitor of growth"),(c,"Gibberellin",3.,"Apical dominance"),(d,"Ethylene",4.,"Epinasty"),(e,"Abscisic acid",5.,"Induces amylase synthesis"):}`A. `a-3, b-1, c-5, d-4, e-5`B. `a-4, b-5, c-1, d-3, e-2`C. `a-2, b-1, c-5, d-3, e-4`D. `a-3, b-1, c-5, d-2, e-4` |
| Answer» Correct Answer - A | |
| 757. |
Assertion : Cytokinin along with the auxin are required for morphogenesis. Reason : More cytokinin to auxin ratio promte root initiation during micropropagation.A. If Both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)B. If both Assertion and reason are true but the reason is not the correct explanation of the assertion, then mark (2).C. If Assertion is true statement but reason is false, then mark (3)D. If both Assertion and reason are false statements, then mark (4). |
| Answer» Correct Answer - C | |
| 758. |
How cytokinin works opposite to auxin? |
| Answer» It stimulates the adventitious shoot fotmation by overcoming apical dominance. | |
| 759. |
What would happen if you forget to add cytokinin to the culture medium ?A. Callus will not develop shoot budsB. Callus will not develop root budsC. Callus will stop differentiatingD. Both (a) and (b) |
| Answer» Correct Answer - A | |
| 760. |
Auxin and cytokinin are antagonistic in which of the following funtions ?A. Cell divisionB. PhototropismC. Apical dominanceD. Geotropism |
| Answer» Correct Answer - C | |
| 761. |
The universal natural auxin of plants isA. IBAB. IAAC. NAAD. Citric auxin |
| Answer» Correct Answer - B | |
| 762. |
In plants auxin synthesis. with high concentration occurs inA. cortex of leavesB. phloem cellsC. shoot tipD. root tip |
| Answer» Correct Answer - C | |
| 763. |
(a) What term is used for seedless fruits? How does auxin induce parthenocarpy ? (b) Name any two other plants where this technique can be applied commercially. |
|
Answer» (a) Parthenocarpic fruits. Auxin induces growth in the ovary wall without fertilization. (b) Lemon, apple. |
|
| 764. |
Why does exogenous application of auxin fail to enhance the growth of intact plants ? |
| Answer» Auxin fails to casue growth of intact plants because the required amount of auxin is alreadly present in such plant and they do not need external supply of auxins. | |
| 765. |
In plant tissue culture experiments, high auxin to cytokinin ratio favours_________development and high cytokinin to auxin ratio favours_______development.A. root, shootB. root, rootC. shoot, shootD. |
| Answer» Correct Answer - A | |
| 766. |
Where are auxin synthesized in plants ? Mention any two of their functions. |
| Answer» Auxins are synthesized in meristematic cells (e.g., root apex, shoot apex, leaf tip, etc.). They produce (i) apical dominance and (ii) Initiate rooting in cuttings | |
| 767. |
Which one the following plant function is not generally governed or controlled by auxinA. apical dominanceB. phototropismC. growthD. photosynthesis |
| Answer» Correct Answer - D | |
| 768. |
Assertion: If a plant is kept horizontally, auxin accumulates on the lower surface. Reason: The displacement of statoliths and other cell organelles to lower surface modifies the translocation patern of auxins.A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.B. If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.C. If Assertion is true, but Reason is false.D. If both Assertion and Reason are false. |
| Answer» Correct Answer - A | |
| 769. |
Auxin is synthesized in which part of the plant ?A. ApicalB. NodalC. InternodalD. Axillary |
| Answer» Correct Answer - A | |
| 770. |
One hormone helps in ripening of fruits while the other stimulates closure of stomata. These are respectivelyA. Abscisic acid and auxinB. Ethylene and abscisic acidC. Abscisic acid and ethyleneD. Ethylene and gibberellic acid |
| Answer» Correct Answer - B | |
| 771. |
A young dicot seedling (e.g., soyabean) is laid horizontally on a surface and is subjected to gravity stimulus. The shoot bends in upward direction and the root bends in downwards direction. Which out of the following is the possible reason for this movement ?A. Redistribution of auxins throughout the seedlings is responsible for the stimulatory unequal growth in shoots and roots.B. Redistribution of cytokinins throughout the seddling is respondible for the stimulatory unequal growth in roots and shoots.C. Redistribution of auxins in roots and cytokinins in shoots is responsible for stimulatory unequal growth.D. Redistribution of auxins in shoots and cytokininis in roots is responsible for stimulatory unequal growth. |
|
Answer» Correct Answer - a Auxins play a paramount role in the various tropic movements shown by plants such as phototropism and gravitropism. Photoropism is the movement in response to light. The shoot tip is responsible for the directional movement in response to sunlight, as tip is the area where auxins are synthesised. The part of the shoot tip which receives direct sunlight will have the least amount of auxin. more auxin present on the shaded side promotes more cell division and elongation, causing the plant to bend towards sunlight. Gravitropism is the movement in response to gravity. Roots bend downwards in response to gravity due to the regulated transport of auxins called as poalr auxin transport. |
|
| 772. |
Assertion. Plants also have hormones called phyto-hormones.Reason. They increase the rate of reactions and thus always accelerate growth and other related changesA. 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 - C | |
| 773. |
Phytohormones areA. Hormonesregulating growth from seed to adulthoodB. Growth regulators synthesised by plants and influencing physiological processC. Harmones regulating floweringD. Harmones regulating Secondary growth |
|
Answer» Correct Answer - b (b) Phytohormones are biochemical substance whichg regulates physiology of the plants. |
|
| 774. |
Abscisic acid controlsA. Cell division B. Leaf fall and dormancy C. Shoot elongation D. Cell elongation and wall formation |
|
Answer» Correct Answer - B Abscisic acid controls leaf fall and dormacy. |
|
| 775. |
Apical dominance isA. suppresion of growth of apical bud by nearby lateral axillary budsB. stimulation of growth of apical bud by removal of nearby axillary budsC. suppression of growth of lateral axillary buds by removal of apical budD. suppression of growth of nearby lateral axillary buds by apical bud |
| Answer» Correct Answer - D | |
| 776. |
Pick up the correct explanationA. Xanthium-Long day plant B. Sunflower-Short day plant C. Wheat-Shon day plantD. Tomato-Day neutral plant |
|
Answer» Correct Answer - C Tomato is day neutral plant |
|
| 777. |
The term phytochrome was introduced byA. Borthwick and Hendricks B. Borthwick C. Moore D. Garner and Allard |
|
Answer» Correct Answer - D The term phytochrome was introduced by Borthwick and Hendricks |
|
| 778. |
Abscisic acid controlsA. cell divisionB. leaf fall and dormancyC. shoot elongationD. cell elongation and wall formation |
|
Answer» Correct Answer - B Abscisic Acid (ABP) is called stress hormone or dormin. It is a growth retarding hormone which induces dormancy, promotes ageing and abscission of fruits, leaves and flowers. It also causes closure of stomata and overcome the conditions of stress |
|
| 779. |
Leaf fall can be prvented byA. abscisic acidB. auxinsC. florigenD. cytokinins |
|
Answer» Correct Answer - D Cytokinin retards senescence and ageing of leaves by preventing disappearance of chlorophyll and degradation of proteins that occur with the ageing process of leaves. |
|
| 780. |
Moving on a grass lawn facilities better maintainance primary owening toA. wounding stimulates regenerationB. of removal of apical dominance and stimulation of intercalary meristemC. of removal of apical dominance and promotion of cambial activityD. of removal of apical dominance |
| Answer» Correct Answer - B | |
| 781. |
Moving on a grass lawn facilities better maintainance primary owening toA. Removal of apical dominance and promotion of lateral meristemB. Removal of apical dominanceC. Wounding which stimuletes rapid regenrationD. None of these |
|
Answer» Correct Answer - b (b) Sometimes apical bud inhibits the growth of lateral buds, it is called apical dominance. By moving on a grass lawn apical buds are removed and apical dominnce of grass is breaked. |
|
| 782. |
Mowing grass lawn facilitates better maintenance becauseA. wounding stimulates regenerationB. removal of apical dominance and stimulation of intercalary meristemC. removal of apical dominanceD. removal of apical dominance and promotion of laieral meristem |
|
Answer» Correct Answer - D Apical dominance of terminal bud is due to the secretion of auxm (IA.A) by it. Accordmg to Thimann and Skoog (1933) removal of apical bud causes sprouting of lateral buds with stimulation of intercalarJ meristem and this is the reason that moveing grass lawn facilitates better maintenance |
|
| 783. |
Parthenocarpic fruits can be produced by application of auxinA. IAA B. IBA C. NAA D. All of the above |
|
Answer» Correct Answer - D Patthenocarpic fruits can be produced by application of auxin (IAA, IBA or NAA) |
|
| 784. |
Parthenocarpic tomato fruites can be produced byA. Rasing the plants from vernlized seedsB. Treating the plants with phenylmercuric acreteC. Removing androecium of flowers before pollen grains are releasedD. Treating the plants eith low concentrations of gibberellic acid and auxins |
|
Answer» Correct Answer - d |
|
| 785. |
Parthenocarpic tomato fruits can be produced byA. Treating the plant with phenyl mercuric acetateB. Removing androecium of flowers before pollen grains are releasedC. Treating the plants with low concentrations of gibberellic acid and auxinsD. Raising the plants from vernalized seeds |
| Answer» Correct Answer - C | |
| 786. |
How does pruning help in making the hedge denseA. It releases wound hormones B. Apical shoot grows faster after pruning C. It frees axillary buds from apical dominance D. It induces differentiation of new shoots from rootstock |
|
Answer» Correct Answer - C Pruning help in making hedge dense because it frees axillary buds from apical dominance. |
|
| 787. |
How does pruning help in making the hedge denseA. It induces the differentiation of new shoots from the rootstockB. It frees axillary buds from apical dominanceC. The apical shoot grows faster after purningD. It releases wound hormones |
| Answer» Correct Answer - B | |
| 788. |
Which one does not exhibit seed dormancy ?A. RhizophoraB. XanthiumC. PhaseolusD. Cassia |
| Answer» Correct Answer - A | |
| 789. |
Cytokinin synthesis is maximum inA. rootsB. leavesC. shoot tipD. fruit |
| Answer» Correct Answer - A | |
| 790. |
The hormones which regulate phloem transport areA. auxinsB. cytokininsC. gibberellinsD. ethylene |
| Answer» Correct Answer - B | |
| 791. |
Which accelerates the abscission in liower and fruit like thinning of cotton, cherry and walnut? A. Auxin B. ABA C. GA3 D. Ethephon |
|
Answer» Correct Answer - D Ethephon accelerates the abscission in flower and fruit like thinning of cotton, cherry and walnut. |
|
| 792. |
Which one of the following pairs , is not correctly matchedA. Abscissic acid - Somatal closureB. Gibberellins acid - Leaf fallC. Cytokinin - Cell divisiionD. IAA- Cell elongation |
|
Answer» Correct Answer - b (b) Gibberellic cid is mainly related with elongation of plant |
|
| 793. |
Which one of the following pairs, is not correctly matched?A. IAA - Cell wall elongationB. Abscisic acid - Stomata closureC. Gibberellic acid - Leaf fallD. Cytokinin - Cell division |
| Answer» Correct Answer - C | |
| 794. |
Which of the following plant hormones is correctly matched with its functionA. Abscisic acid-promotes seed dormancyB. Gibberellic acid-promotes fruit ripeningC. Auxin-promotes leaf senescenceD. Cytokinin-promotes seed dormancy |
| Answer» Correct Answer - A | |
| 795. |
Which one of the following pairs is not correctly matched?A. IAA-Cell wall elongationB. Abscisic acid-Stomatal closureC. Gibberellic acid-Leaf fallD. Cytokinin-Cell division |
| Answer» Correct Answer - C | |
| 796. |
Which one of the following pairs , is not correctly matchedA. Abscisic acid - Stomatal closureB. Gibberellic acid - Leaf tallC. Cytokinin - Cell divisionD. IAA - Cell wall elongation |
|
Answer» Correct Answer - B Gibberellins help in cell growth of stem, leaves and other aerial parts |
|
| 797. |
Pr state of phytochrome absorbs light wave-length ofA. 660 nm B. 640 mm C. 620 nmD. 720 nm |
|
Answer» Correct Answer - A state of phytochrome absorbs light wavelength of 660 nm |
|
| 798. |
Growth in length is measured with the help ofA. Manometer B. Auxanometer C. Potometer D. Clinostat |
|
Answer» Correct Answer - B Growth in length is measured with the help of auxanometer |
|
| 799. |
The wavelength of light absorbed by Pr form of phytochrome isA. 640 nmB. 680 nmC. 720 nmD. 620 nm |
|
Answer» Correct Answer - a (a) Actual absorption spectrum of `P_(R)` is 660 which is not in answer so answer may be 640 nm. |
|
| 800. |
Vemalisation occurs in response to A. Highlightintensity B. Low temperature C. High temperature D. Lowlightintensity |
|
Answer» Correct Answer - B Vemalisation occurs in response to low temperature |
|