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.
| 201. |
2, 4-D is an effectiveA. RodenticideB. WormicideC. FungicideD. Weedicide |
| Answer» Correct Answer - D | |
| 202. |
`CH_(2)=CH_(2)` is mainly responsible forA. Formation of internodeB. Formation of nodesC. Ripening of fruitsD. Formation of internodes |
| Answer» Correct Answer - C | |
| 203. |
For flowering, critical dark period should always be exceeded inA. Long day plantsB. Short day plantsC. Day neutral plantsD. All types of plants |
| Answer» Correct Answer - B | |
| 204. |
IAA mainly inhibits the growth ofA. RootB. LeafC. ShootD. Generally whole plant |
| Answer» Correct Answer - D | |
| 205. |
`CH_(2)=CH_(2)` is mainly responsible forA. Formation of root hairB. Formation of nodesC. Ripening of fruitsD. Formation of internodes |
| Answer» Correct Answer - C | |
| 206. |
Anti gibberellin isA. Cycocel B. Plastoquinone C. 1AA D. Ubiquinone |
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Answer» Correct Answer - A Antigibberellin is cycocel. |
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| 207. |
Which is not true for abscisic acid?A. Acts as an anti-tranpirantB. Synthesized in chloroplast from carotenoidsC. Increases stress tolerance in plantsD. Induces epinasty of leaves and flowers |
| Answer» Correct Answer - A | |
| 208. |
Which of the following is an anti-gibberellin as well as a stress hormone?A. ABAB. CKC. NAAMD. 2, 4-D |
| Answer» Correct Answer - B | |
| 209. |
Triple response is shown by hormoneA. EthyleneB. CKC. 2, 4-DD. `GA_(3)` |
| Answer» Correct Answer - A | |
| 210. |
Photoperiodism is probably due to synthesis ofA. Cytokinins B. GibberellinsC. Auxm D. Florigen |
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Answer» Correct Answer - D Photoperiodism is probably due to synthesis of florigen |
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| 211. |
Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant? |
| Answer» Different plant organs, tissues and cells grow differently under various stage of the life cycle. For example, a cell formed immediately after mitosis, increases in the amount of protoplasm and then mature into a specic kind of cell. The plant organs, such as leaves, increase in surface area. Stem and roots primarily grow in length and then in girth. Thus, the flowering plants exhibit serveral parameters such as increase in fresh weight, dry weight, length, area, volume, etc., to demonstrate growth. | |
| 212. |
Describe briefly |
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Answer» (a) Arithmetic growth, If the length of a plant organ is plotted against time shown a linear curve, the growth is called arithmetic growth. (b) Geometric growth. Such type of growth, that occurs in many higher plants and plant organss and measured in size or weight, is called geometric growth. (c) Sigmoid growth curve. If the geometrical growth is plotted against time, it shows a sigmoid growth curve. (d) Absolute and relative growth rates. Increase in total of two organs measured and compared per unit time is called absolute growth rate. The growth of the given system per unit time expressed on a common basis is called relative growth rate. |
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| 213. |
Low temperature treatment to speed up the process of flowering is referred to asA. Short day length B. Long day length C. Critical daylengthD. Intervening light period |
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Answer» Correct Answer - C The photoperiod required to induce Howering is referred to as critical day length. |
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| 214. |
The rate of growth of any organism follows Or Typical growth curve in plants isA. Stair-steps shapedB. Parabolic C. Sigmoid D. Linear |
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Answer» Correct Answer - C Typical growth curve in plants is sigmoid |
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| 215. |
Gibberellinisa A. Sterol B. Vitamin C. Sugar D. Protein |
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Answer» Correct Answer - A Gibberellin is a sterol |
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| 216. |
From which was zeatin isolated ?A. Coconut milkB. PineappleC. SoyabeanD. Groundnut |
| Answer» Correct Answer - A | |
| 217. |
Bakanae disease in Japan was due to a fun- gus known asA. Gibberella fujikoriB. Aspergillus flavusC. Both (1) and (2)D. Plasmopara viticola |
| Answer» Correct Answer - A | |
| 218. |
Functions of auxins includeA. promoting flowering in pineappleB. induing parthenocarpy in tomatoC. use as herbicides to kill dicot weedsD. all of these |
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Answer» Correct Answer - D NA A and 2,4-D are often employed for inducing flowering in litchi and pineapple. Application of auxins (e.g., IA A, IBA) and conjugate auxins (e.g., IBA-alanine) to unpollinated pistils make them develop into seedles fruits (or parthenocarps) which carry a better market price than the normal fruits having seeds. 2,4-D and 2,4,5-T are used as weedicides (herbicides) which destroy broad leaved weeds in cereal crops and lawns. Dalapon (2,2-dichloropropionic acid) Kills grasses in broad leaved crops. |
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| 219. |
What are two types of auxin? |
| Answer» Natural and synthetic auxins. | |
| 220. |
What do you mean by plant growth inhbitors? |
| Answer» The chemical substances which are involved in growth inhibiting activities like dormancy and abscission. | |
| 221. |
Which of the following statements regarding gibberellins is incorrect?A. `GA_(3)` was one of the first gibberellins to be discoveredB. All GA are acidicC. They increase the length of plant axis as in graphs sugarcanes etc.D. They promote senescence. |
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Answer» Correct Answer - D Gibberellins are weak acidic growth hormones having gibbane ring structure which cause cell elongation of intact plant in general and increases internodal length of genetically dwarfed plants (e.g., pea, corn), in particular. `GA_(3)` was one of the first gibberellins to be discovered and remains the most intensively studdied form. The major sites of gibberellin production in plants are embryos, roots and young leaves near the shoot tip. |
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| 222. |
Give an example of plant growth promoter. |
| Answer» Auxin, gibberellin and cytokinin. (any two) | |
| 223. |
Select the pair that consists of plant growth promoters only.A. Auxins and cytokininsB. Gibberellins and ABAC. Ethylene and ABAD. All of these |
| Answer» Correct Answer - A | |
| 224. |
Which of the following is both a growth promoter as well as a growth inhibitor?A. AuxinB. Gibberellic acidC. ABAD. Ethylene |
| Answer» Correct Answer - D | |
| 225. |
Which one of the following acids is a dervative of carotoidsA. Indole butyric acidB. Indole-3-acetic acidC. Gibberellic acidD. Abscisic acid |
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Answer» Correct Answer - d (d )Seed germination is limited and hence abcesic acid induces dormancy of seeds and buds. |
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| 226. |
Hormone antagonist to gibberellins isA. IAA B. ABA C. Zeatin D. Ethylene |
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Answer» Correct Answer - B Hormone antagonist to gibberellins is ABA. |
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| 227. |
Through their effect on plant growth regiulators, what do the temperature and light control in the plantsA. Stomatal closureB. Apical dominanceC. Flowering D. Fruit development |
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Answer» Correct Answer - C Through their effect on phytohormones, temperature and light control flowering |
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| 228. |
The movement of pollen tube is calledA. ChemotropismB. ThermotaxisC. ThermonasticD. Hydrotropism |
| Answer» Correct Answer - A | |
| 229. |
Ethylene gasA. Is a saturted hydrocarbonB. Slows down the ripending of applesC.D. |
| Answer» Correct Answer - d | |
| 230. |
Root development is promoted byA. AuxinB. GibberellinC. EthyleneD. Abscisic acid |
| Answer» Correct Answer - A | |
| 231. |
Root development is promoted byA. Abscisic acidB. AuxinC. GibberellinsD. Ethylene |
| Answer» Correct Answer - D | |
| 232. |
In aquatic plant Ranunculus flabellair (buttercup), submerged leaves are highly dissected whereas the emerged leaves are broad and lobed. This is an example ofA. heterophyllyB. enviornmental plasticityC. phenologyD. both (a) and (b) |
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Answer» Correct Answer - D Heterophylly is the occurrtence of different types of leaves on the same plant in different growth phases or under different environmental conditions. In case of environmental plasticity as shown by aquatic plant Ranunclus flabellaris (Buttercup), the submerged leaves are highly dissected whilke the emerged leaves are broad and lobed. |
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| 233. |
Intrinsic heterophylly is found in all exceptA. cottonB. enviornmental plasticityC. carianderD. larkspur |
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Answer» Correct Answer - B The plants cotton, coriander ad larkspur exhibit intrinsic plasticity or heterophylly because the leaves of juvenile plants are quite different is shape from those of mature plants. |
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| 234. |
Which one of the following pairs, is not cor- rectly matched ?A. Cytokinin - Cell divisionB. IAA - Cell wall elongationC. Abscissic Acid - Stomata! closureD. Gibberellic Acid - Leaf fall |
| Answer» Correct Answer - D | |
| 235. |
Which is not a requirement of vernalization?A. Aerobic conditionB. MoistureC. high temperatureD. Differentiated tissues |
| Answer» Correct Answer - C | |
| 236. |
Find the odd one (w.r.t. photoperiod) from the following.A. RiceB. CosmosC. ChrysanthemumD. Larkspur |
| Answer» Correct Answer - D | |
| 237. |
The acquisition of ability to flower by chilling treatment is calledA. VernalizationB. YarovizationC. SpringificationD. All of these |
| Answer» Correct Answer - A | |
| 238. |
A long day plant flowers only when it is exposed toA. Red lightB. Light more than critical day lengthC. Light equal to ciritical day lengthD. Light less than critical day length |
| Answer» Correct Answer - B | |
| 239. |
Which of the folloewing is a long day plantA. TobaccoB. Glycine maxC. Mirabills JalapaD. Spinach |
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Answer» Correct Answer - D Plants which require long-day photopenod for flowering and a small dark period for vegetation are known as long-day plants, e g. spinach. |
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| 240. |
Which of the following plant is LDP?A. XanthiumB. SoyabeanC. WheatD. Tobacco |
| Answer» Correct Answer - A | |
| 241. |
Assertion: "Touch" responses in Mimosa is an example of such movement. Reason : Nastic movements occur in the direction of stimulus.A. Tropic B. Nastic C. Tactic D. All of the above |
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Answer» Correct Answer - D In movement occurs due to external stimulus tropic, mastic and tactic |
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| 242. |
Namet he volatile substance which was confirmed by coisins from riperied oranges. |
| Answer» Correct Answer - Ethylene | |
| 243. |
In some plants, the leaves of the juvenile plant are different in shape from those in mature plants. This is the heterophylly due to phases of life and seen inA. Cotton, coriander and buttercupB. Buttercup and larkspur C. Buttercup onlyD. Cotton, coriander and larkspur |
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Answer» Correct Answer - D In some plants, the leaves of the juvenile plant are different in shape from those in mature plants. This is the heterophylly due to phases of life and seen in cotton, coriander and larkspur |
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| 244. |
Absicisic acid Treatment results inA. Leaf expansionB. Stem elongationC. Stomatal closureD. Root elogation |
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Answer» Correct Answer - c (c )ABA inhibits the `H^(+)|K^(+)` exchange and promotes the leakage of maleic acid. The reduction The reduction of osmotically active solutes would render the guard cells flaccid and keep the stomatal pore clopsed |
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| 245. |
In some plants, the shapes of leaves produced in air is different from those produced in water. This the heterophyllous development as seen in A. Cotton, coriander and buttercup B. Buttercup and larkspur C. Buttercup only D. Cotton, coriander and larkspur |
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Answer» Correct Answer - C In some plants, the shapes of leaves produced in air is different from those produced in water. This the heterophyllous development as seen in buttercup |
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| 246. |
To remove seed dormany by mechainical removing of seed coat is calledA. StratificatonB. ScarificationC. VeralizatonD. photoperiodism |
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Answer» Correct Answer - b (b) Scarification is menchanical or chemical method to soften/ weaken hard seed coat by chipping, filing or machine threhing, hot water, fat solvent, `H_(2)SO_(4)`. |
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| 247. |
The name zeatin was coined byA. Skoog B. Miller C. Latham D. Melvin |
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Answer» Correct Answer - C The name zeatin was coined by Latham. |
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| 248. |
Which plant hormone promotes seed ,but dormany and caues stomatal closure Or Presence of ehich of the following in seed is associated with doemancy Or Leaf abscission , fruit fall , but dormancy occurs by which phytohormoneA. IAAB. Abscisic acidC. `GA_(1)`D. Cytokinin |
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Answer» Correct Answer - b (b) Abscisic acid (also called stress harmone) is a mildily acidic growth harmone which function as a general growth inhibitor by counteracting other harmones (auxin,gibberlin,cytokinin) or the reactors immidiated by them. ABA induced bud dormancy, seed dormancy closure of stomata and stoppage of cabial activity |
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| 249. |
IAA was first isolated fromA. Corn germ oil B. Human urine C. Gibberella D. Rhizopus |
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Answer» Correct Answer - C IAA (auxin) was first isolated from human urine. |
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| 250. |
What is the action spectrum of photo peridismA. 430 and 660 nmB. 640 and 660 nmC. 660 and 730 nmD. 700 and 900 nm |
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Answer» Correct Answer - c (c ) Because two types of phytochrome is present in plants i.e., `P_(660)` and `P_(730)`. |
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