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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.
| 251. |
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap ?A. AcidicB. AlkalineC. Low refrective indexD. The absence of sugar |
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Answer» Correct Answer - B The phloem sap is alkaline in nature. It continuously pumps protons from its companion cells to the other neighbouring cells during transportof sugars. |
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| 252. |
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap ?A. AcidicB. AlkalineC. Law refractive indexD. The absoence of sugar |
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Answer» Correct Answer - B The phloem sap is alkaline in nature. It continuously pumps protons form its companion cells to the other neighbouring cells during transport of sugars. |
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| 253. |
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap ?A. Absence of sugerB. AcidicC. AlkalineD. Low refractive index. |
| Answer» Correct Answer - C | |
| 254. |
Why is primary xylme in root exarch and in stem endarch ? Expain |
| Answer» Primary xylme is exarch inroots to facilitate maximum inward movement of water from the cortex in stem primary xylem is endarch to minimise the loss of water through cortex and epidermis | |
| 255. |
Path of water movement from soil to xylme isA. `solil rarr root hair rarr cortex rarr pericycle rarr endodermis rarr metaxylme rarr protoxylme`B. `soil rarr root hari rarr cortex rarr endodermis rarr pericycle rarr protoxylem rarr metaxylme`C. `soil rarr root hari rarr epidermis rarr phloem rarr xylme`D. `soil rarr root hair rarr epidermis rarr cortex rarr pholem rarrr xylem` |
| Answer» Correct Answer - b | |
| 256. |
Cobalt chloride is blue in anhydrous state . In contact with water vapours it turnsA. redB. violetC. pinkD. yellow |
| Answer» Correct Answer - C | |
| 257. |
Give reason why the xylme sap flows out form the cut end if a well hydrated plant is cut below the first leaf or near the base of stem |
| Answer» Flow of xylem sap through the cut end is called exudation it occurs due to hydorstatic pressrue developed in the root system due to accumultion of water absorbed by the cells fo the root such pressure is called root pressure | |
| 258. |
Loss of water in the form of vapours from the living tissues of aerial plant parts is calledA. transpirationB. guttationC. bleedingD. precipitation. |
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Answer» Correct Answer - A the loss of water in the vapour form from the exposed parts of a plant is called transpiration the loss of water due to transpiration is quite high. It is `2` litres per day in sunflower `36-45` litres in apple and upto `1` tonne per day in elm tree. |
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| 259. |
When aerial parts of a plant are cut the sap exudes from the root with a force , the phenomenon underlying this isA. imbibition pressureB. root pressureC. osmotic pressureD. capillary force |
| Answer» Correct Answer - B | |
| 260. |
Most accepted theory for ascent of sap is Sap ascends in woody stems because of root pressure andA. Capillarity theoryB. Root Pressure theoryC. Pulsation theoryD. Transpiration pull theory |
| Answer» Correct Answer - D | |
| 261. |
Root pressure helps in ascent of sap byA. Pumping food in phloemB. Pumping sap into xylem in rootsC. Pumping sam in stem for sending it to rootsD. All the above |
| Answer» Correct Answer - B | |
| 262. |
Root pressure theory of ascent of sap is unacceptable becauseA. Water can ascend without root or root pressureB. Root pressure cannot explain ascent of sap beyond 10 metersC. Root pressue is more during early morning then afternoonD. Root pressure does not occur in spring . |
| Answer» Correct Answer - A | |
| 263. |
The force with which water molecules are held together in xylem isA. Imbibition pressureB. Osmotic pressureC. Adhesion forceD. Cohesion force |
| Answer» Correct Answer - D | |
| 264. |
The teansport of sap from root to top of the plant isA. Ascent of sapB. ConductionC. TransportD. Translocation |
| Answer» Correct Answer - A | |
| 265. |
In xylem, the ascent of sap takes place inA. Tracheids with associated xylem parenchymaB. Walls of tracheary elementsC. Xylem perenchymeD. Lumen of tracheary elements |
| Answer» Correct Answer - D | |
| 266. |
According to imbibition theory I. ascent of sap could takes place by imbibition through the walls of xylem. II. Water can rise through the wall due to imbibitional pressure upto a certain height only. III. The pressure at the transpiring surface falls below that of atmsophere. IV. rate of transpiration is roughly equal to the rate of imbibition.A. I and IIB. II and IVC. Only IVD. Only III |
| Answer» Correct Answer - A | |
| 267. |
The transpiration-driven ascent of xylem sap depends mainly upon`"______"` property of water.A. cohesionB. adhesionC. surface tensionD. all of these. |
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Answer» Correct Answer - D There is a continuous column of water from root through the stem and into the leaves. The water column is present in tracheary elements the column of water does not fall down under the impact of gravity because forces of transpiration provide both energy and necessary pull . Cohesion, adhesion and surface tension keep the water in place. |
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| 268. |
Opening and closing of stomata is due toA. hormonal change in guard cellsB. change in turgor pressure of guard cellsC. gaseous exchangeD. respiration |
| Answer» Correct Answer - B | |
| 269. |
Discuss the factors responsible for ascent of xylem sap in plants. |
| Answer» Xylem sap ascend mainly due to froces generating in the foiage of plants as a result of active transpiration thus the factors which enhance the rate of transpiration are also the factgors responsible for ascent of xyhleme sap in plants | |
| 270. |
Statement 1: Xylem transport is unidirectional. Statement 2: Phloem transport is bi-directional.A. Both statements `1` and `2`are correct.B. Statement `1` is correct but statement `2` is incorrect.C. Statement `1` is Incorrect but statement `2` is correct.D. Both statement `1` and `2` are incorrect. |
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Answer» Correct Answer - A Water passage from root hair to xylem and then to other parts is undirectional (unidirectional upwards in xylem). The dirction of movement of organic solutes in phloem can be upwards or downwards `i.e.` bi-directional. |
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| 271. |
What essential role does the root endodermis play during mineral absorption in plants? |
| Answer» In plants, nutrients are absorbed through the active and passive transports. The endodermal cells of the roots containing suberin allow only selected minerals to pass through them. The transport proteins present in the membranes of these cells act as check points for the various solutes reaching the xylem. | |
| 272. |
In isobilateral leaf, the number of stomata per unit area areA. More on upper surfaceB. More on lower surfaceC. Approximately same on both the surfacesD. Absent on upper surface |
| Answer» Correct Answer - C | |
| 273. |
Match the columns and find out the correct combination `{:((a),"Bulliform cells ",(i),"Lenticels "),((b),"Subsidiary cells ",(ii),"Isobilateral leaf"),((c),"Epithen",(iii),"Stomata"),((d),"Complementary cells",(iv),"Hydathodes"),(,,(v),"Phellem"):}`A. (a) - (ii), (b) - (iii), (c) - (i), (d) - (ii)B. (a) - (i), (b) - (ii), (c) - (iv), (d) - (iii)C. (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)D. (a) - (iii), (b) - (ii), (c) - (iv), (d) - (i) |
| Answer» Correct Answer - C | |
| 274. |
Lenticels are involved inA. Gaseous exchangeB. Food transportC. PhotosynthesisD. Transpiration |
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Answer» Correct Answer - A |
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| 275. |
Guttation is the result ofA. OsmosisB. Root pressureC. DiffusionD. Transpiration |
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Answer» Correct Answer - B |
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| 276. |
Concetration of miverals in the soil is usually `"______"` than the concentration minerals in the root.A. lowerB. higherC. similarD. none of these. |
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Answer» Correct Answer - A Concentration of minerals in the soil is lower than in root They dissolve in water and move around soil in the solution. Root hair cells are adapted to absorb e water out of soil by osmosis. Root hair cells have carrier molecules on their surface that pick up the minerals and move them into the cell against the concentration gradient. |
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| 277. |
Match column `I` with column `II` and select the correct option from the codes given below. A. `A - (iv),B-(i),C-(iii),D-(ii),E-(v)`B. `A - (iv),B-(i),C-(ii),D-(iii),E-(v)`C. `A - (iii),B-(iv),C-(i),D-(ii),E-(iv)`D. `A - (i),B-(ii),C-(iii),D-(iv),E-(v)` |
| Answer» Correct Answer - B | |
| 278. |
Imbibition involvesA. Solute potentialB. Gravity potentialC. Matric potentialD. Pressure potential |
| Answer» Correct Answer - B | |
| 279. |
Imbibition theory was given byA. SachsB. BoehmC. ScholanderD. Curtis |
| Answer» Correct Answer - A | |
| 280. |
Asseriton Due to exessive use of fertilizers the avaiblabe water to the plnats becomes hypotonic in relation to cell sap Reason The ater molecules as a resutl diffuse out of the cells due ot endosmosisA. If both Assertion and Reason are true and the Reason is a correct expanation of the AssertionB. If both Assertion and Reason re true but Reason is not a correct eplanatin of the AssertionC. If Assertion is true but the Reason is falseD. If both Assertion and Reason are false |
| Answer» Correct Answer - d | |
| 281. |
(a) What is imbibition? How is it differnet form osomisis? (b)What is the importance of imbibition to the plants |
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Answer» (a) Imbibition is the phenomenon of adsoption of water or any other liquid by solid paritcles of a substance without forming a solution In somoisis absormpiton phenomenon is involved however in imbibition adsroption phenomenon occurs (b) Imbibition helps in seed germination by breaking the seed coat after imbibing water |
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| 282. |
Guard cells help inA. protection against grazingB. transpirationC. guttationD. fighting against infection |
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Answer» Correct Answer - B Guard cells help in transpiration. Stomata are surrounded by two specialised epidermal cells, called guard cells. Because of their small size guard cells are repidily influenced by turgor changes and thus regulate the opening and closing of stomata. Stomata are involved in releasing water vapour into the atmosphere. This process is known as transpiration. |
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| 283. |
The rupture and fractionation do not usualy occur in the water column in vessel/tracheids during the ascent of sap because ofA. Weak gravitational pullB. Transpiration pullC. Lignified thick wallsD. Cohesion and adhesion |
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Answer» Correct Answer - D |
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| 284. |
The rupture and fractionation do not usualy occur in the water column in vessel/tracheids during the ascent of sap because ofA. lignified thick wallsB. cohesion and adhesionC. weak gravitational pullD. transpiration pull |
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Answer» Correct Answer - B The vaetical conduction fo wter from root to aerial parts of plant is called ascent of sap. The water molecules remain joined to each other due to a force of attraction called cohesion force. This atraction is due to the presence of hydrogen bonds between them. The magnitude of this force is vey high therefore, continuous water column in the cylem cannot be broken easily due to the force of grvity or other obstructions offered by internal tissues in the upward mvement of water. This adhesive property of water i.e., attraction between the water molecules and the walls of xylem also ensures the continiuity of water column in xylem. |
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| 285. |
The rupture and fractionation do not usualy occur in the water column in vessel/tracheids during the ascent of sap because ofA. Transpiration pullB. Lignified thick wallsC. Cohension and adhesionD. Weak gravitational pull |
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Answer» Correct Answer - C |
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| 286. |
Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure-7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will beA. Movement of water of Cell A to BB. Movement of water from cell B to AC. No movement of waterD. Equilibrium between the two |
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Answer» Correct Answer - A |
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| 287. |
Root hairs absorb water from soil due toA. Osmotic pressureB. Turgor pressureC. Suction pressureD. Root pressure |
| Answer» Correct Answer - C | |
| 288. |
The root hairs absorb from soilA. percolating waterB. capillary waterC. hygroscopic water surrounding each soil particleD. water from the water table |
| Answer» Correct Answer - B | |
| 289. |
If a cell `A` with `DPD 5` atm is surrounded by many cells with `DPD 4` atm thenA. the net movement of water will be from cell `A` to the surrounding cellsB. net movement of water will be from the surrounding cell to cell `A`C. water will not move at allD. water movement will depend on other unknown factors. |
| Answer» Correct Answer - B | |
| 290. |
Which one of the following is not related to guttationA. Water is given out in the form of dropletsB. Water given out is impureC. Water is given out early morningD. Guttation is of universal occurrence |
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Answer» Correct Answer - D |
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| 291. |
If cell A with DPD-5 atm is surrounded by many cells with DPD-4 atm.A. the net movement of water will be from cell A to the surrounding cellsB. net movement of water will be from the surrounding cells to cell AC. water will not move at allD. water movement will depend on other unknown factors |
| Answer» Correct Answer - A | |
| 292. |
Addition of solute in the cell develops DPD of a cells mainly depends uponA. TPB. OPC. DPD. WP |
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Answer» Correct Answer - B |
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| 293. |
Change in diffusion pressure of a pure solvent, when it is added with a solute, is calledA. osmosisB. diffusionC. DPDD. imbibition |
| Answer» Correct Answer - C | |
| 294. |
Addition of a solute to pure water causesA. Negative water potentialB. More negative water potentialC. Positive water potentialD. More positive water potential |
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Answer» Correct Answer - A |
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| 295. |
Addition of a solute to pure water causesA. negative water potentialB. negative turgor pressureC. positive water potentialD. no change in water potential |
| Answer» Correct Answer - A | |
| 296. |
Which of the following is an example of imbibition?A. Uptake of water by root hairB. Exchange of gases in stomataC. Swelling of seed when put in soilD. Opening of stomata |
| Answer» Correct Answer - C | |
| 297. |
Guttation is the process of elimination of water from plants through or Guttation occurs from or The pores in leaves through which water comes out in the form of droplets are called or A specialized multicellular structure in leaves which excretes water droplets is called asA. StomataB. HydathadesC. LenticelsD. Wounds |
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Answer» Correct Answer - B Guttation is the process to elimination of water from plants through hydathodes. |
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| 298. |
The water that comes out during guttation isA. a solution containing many organic and inorganic substancesB. a solution containing organic substancesC. a solution containing inorganic substancesD. pure water . |
| Answer» Correct Answer - A | |
| 299. |
With rise in turgidity, wall pressure willA. increaseB. decreaseC. fluctuateD. remain unchanged |
| Answer» Correct Answer - A | |
| 300. |
The antitranspirants areA. phenyl mercuric acetateB. auxinsC. IAAD. cytokinin |
| Answer» Correct Answer - A | |