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. |
Given below are assertion and reason. Assertion. When the ambient temperature is high and the soil contains exces of water, the plants tend to loss water in the form of droplets from lenticels Reason . Root pressure regulates the rate of loss of water from lenticels .A. if both are true with reason being correct explanation (A),B. both true but reason is not correct explanation (B),C. Assertion is ture but reason is wrong (C),D. both are wrong (D), |
| Answer» Correct Answer - D | |
| 2. |
Unloading of phloem at sink includesA. passive transportB. diffusionC. osmosisD. active transport |
| Answer» Correct Answer - D | |
| 3. |
Phloem loading and unloading process are respectivelyA. Active , PassiveB. Passive , ActiveC. Active , ActiveD. Passive , Passive |
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Answer» Correct Answer - C |
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| 4. |
Assertion most mineerlals must enter the rot by active absorption into the cytoplasm of epidermal cell Reason Thius transportation needs energy in the form of ATP some ions also move into the epidermal cells passivelyA. 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 - a | |
| 5. |
Assertion: The chemical potential of pure water at normal temperature and pressure is zero. Reason: In soluton, value of water potential is always positive.A. 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 - c | |
| 6. |
Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A-E) make it useful as a storage material (A) Easily translocated (B) Chemically non-reactive (C) Easily digested by animals (D) Osmotically inactive (E) Synthesized during photosynthesis The useful proeprties ar :A. II and IIIB. II and IVC. I, III and VD. I and V |
| Answer» Correct Answer - B | |
| 7. |
Starch is insoluble in water yet it is accumlated in large quantities in potato becauseA. It is synthesised in potato fuber itselfB. It is translocated from the leaves to the potato tuber in the form of sugarC. Soil micro-organism deposit starch in tuberD. It is useful consumption |
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Answer» Correct Answer - b |
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| 8. |
If cohesion-tension transpiration pull theory is correct, a break in water colimn shouldA. have no effect at allB. increase the rate of photosynthesisC. increase the water contents of leavesD. cause the mesophyll cells to become flaccid and result in wilting of leaves |
| Answer» Correct Answer - D | |
| 9. |
The basic features of cohesion-tension theory are I. continuous water column. II. Cohesive and adhesive properties. III. Transpiration pull. IV. Imbibitional force.A. Only IIB. II and IIIC. Only ID. I, II and III |
| Answer» Correct Answer - D | |
| 10. |
The principal by which blotting papar absorbs water isA. Capillary actionB. Transpiration pullC. Root pressureD. Absorptive capacity |
| Answer» Correct Answer - A | |
| 11. |
If cohesion-tension transpiration pull theory is correct, a break in water colimn shouldA. Increase water content of leavesB. Increase rate of photosynthesisC. Cause wilting of leavesD. Have no effect at all |
| Answer» Correct Answer - C | |
| 12. |
A Cell is plasmolysed after being kept in hypertonic solution. What will be present between cell wall and plasmalemma ?A. Isotonic solutionB. Hypertonic solutionC. AirD. Hypotonic solution |
| Answer» Correct Answer - B | |
| 13. |
A cell is plasmolysed after being kept in hypertonic solution . What will be present between cell wall and plasmalemma ?A. isotonic solutionB. hypertonic solutionC. AirD. Hyptonic solution |
| Answer» Correct Answer - B | |
| 14. |
Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants? |
| Answer» In tall trees, water rises with the help of the transpirational pull generated by transpiration or loss of water from the stomatal pores of leaves. This is called the cohesion-tension model of water transport. During daytime, the water lost through transpiration (by the leaves to the surroundings) causes the guard cells and other epidermal cells to become flaccid. They in turn take water from the xylem. This creates a negative pressure or tension in the xylem vessels, from the surfaces of the leaves to the tips of the roots, through the stem. As a result, the water present in the xylem is pulled as a single column from the stem. The cohesion and adhesion forces of the water molecules and the cell walls of the xylem vessels prevent the water column from splitting. In plants, transpiration is driven by several environmental and physiological factors. The external factors affecting transpiration are wind, speed, light, humidity, and temperature. The plant factors affecting transpiration are canopy structure, number and distribution of stomata, water status of plants, and number of open stomata. Although transpiration causes water loss, the transpirational pull helps water rise in the stems of plants. This helps in the absorption and transport of minerals from the soil to the various plant parts. Transpiration has a cooling effect on plants. It helps maintain plant shape and structure by keeping the cells turgid. Transpiration also provides water for photosynthesis. | |
| 15. |
Select incorrect statement w.r.t. translocation of mineral ions.A. The chief sinks for the mineral elements are the apical and lateral meristems.B. Most readily mobilised element are N,P,KC. Most of the nitrogen travels as inorganic ions through xylem.D. Small amount of P and S are carried as organic compound through xylem. |
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Answer» Correct Answer - C |
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| 16. |
Uphill transport `I.e.` movement of substances from their lower concentation to their higher concentration occurs inA. simple diffusionB. facilitated diffusionC. active transportD. both `(b)`and `(c)`. |
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Answer» Correct Answer - C In active transport, the movable carrier proteins are called pumps. They employ ATP energy for transport across the membrane. It is uphill transport, i.e., against concentration gradient and is faster then passive transport. The rate of active transport reaches the maximum when all the protein pumps are being used in transport (Saturation effect). Carrier proteins are highly specific like enzymes. They are also sensitive to inhibitors that react with protein side chains. |
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| 17. |
A solution of 1.0 M glucose develops a pressure of -27 bars in an oxmometer. What is not correct ?A. Pressure potential is -27 barsB. Osmotic pressure in 27 barsC. Osmotic potential is -27 barsD. Solute potential is -27 bars |
| Answer» Correct Answer - A | |
| 18. |
In tall plants, because of which factor, continuous water coloum extends upwards ?A. Atmospheric pressureB. Osmotic pressureC. Suction pullD. root pressure |
| Answer» Correct Answer - C | |
| 19. |
Which can preserve food stuffA. Sugar and vinegerB. Salt and sugerC. VinegarD. All the above |
| Answer» Correct Answer - D | |
| 20. |
Compared to 1M sucrose solution, the `Psiomega` of 1M sodium chloride solution isA. HighB. SameC. None of the aboveD. Lower |
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Answer» Correct Answer - C Compared to 1 M sucrose solution the `Psi_(omega)` of 1 M sodium chloride solutionis lower because NaCl is electrolyte and produces `Na^(+)` and `Cl^(+)` ino. |
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| 21. |
Compered to 1M sucrose solution, the `Psi_(omega)` of 1M sodium chlorida solution isA. HighB. SameC. LowerD. None of the above |
| Answer» Correct Answer - C | |
| 22. |
When a cell is kept in 0.5 M solution of sucrose its volume does not alter. If the same cell is placed in 0.5 M solution of sodium chloride, the volume of the cellA. increaseB. decreaseC. cell will be plasmolysedD. will not show any change |
| Answer» Correct Answer - D | |
| 23. |
A cell with fully elastic wall is placed in hypertonic solution. What will not happwn ?A. Change in call size and shapeB. The whole cell will shrinkC. Cytoplam shrinks from the cell well and undergoes plasmolsisD. Decrease in cell size . |
| Answer» Correct Answer - C | |
| 24. |
Thin and elastic walls of guard cells areA. Inner lateralB. InnerC. OuterD. Outer lateral |
| Answer» Correct Answer - D | |
| 25. |
If the cell wall is elastic instead of being rigid and if the cell is put in a medium of sugar solution of higher concentration than in the cell thenA. the cytoplasm will be pulled away from the wall as water moves outB. cell shape and size will not changeC. the cell wall will shrink along with the cytoplasmD. the cell wall will rupture as the cytoplasm shrinks |
| Answer» Correct Answer - C | |
| 26. |
If a mesophytic plant is taken from Delhi to Mussorie, its transpiration rate willA. decreaseB. increaseC. remain the sameD. first decrease then increase |
| Answer» Correct Answer - B | |
| 27. |
Assertion:Water in liquid form reaches to plant surfaces in transpiration process. Reason:At plant surface, water changes from liquid to vapour phase. |
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Answer» Correct Answer - d |
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| 28. |
The carrier - mediated cotransport in which a solute is actively transported across a membrane against the gradient of electrochemical potential by coupling the uphill transport of one solute to the downhill transport of another in an example ofA. Symport transportB. Primary active transportC. Facilitated diffusionD. Antiport transport |
| Answer» Correct Answer - D | |
| 29. |
The osmotic potential and pressure potential of three cells (A, B, C) located in different parts of an actively transpiring plant are given below Identify these three cells as root hair, root cortical and leaf mesophyll cells respectively A. A, B, CB. A, C, BC. C, A, BD. B, C, A |
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Answer» Correct Answer - C |
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| 30. |
Osmotic potential and pressure potential of three cells , a,b,s located in different parts of an actively transpiring plant are `{:("Cell","O.P (MPa)", "P.P(MPa)"),(a,-0.87,0.44),(b,-0.92,0.34),(c,-0.68,0.27):}` which ones are roots hair , root cortical and mesophyll cells respectivelyA. a,b,cB. a,c,bC. c,a,bD. b,c,a |
| Answer» Correct Answer - C | |
| 31. |
Arrraction of water molecules to polar surfaces is known asA. cohesionB. capillarityC. surface tensionD. tensile strength |
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Answer» Correct Answer - D Adhesion is the attraction of unlike molecules to each other, such as that between water and the walls of xylem vessels in plants. |
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| 32. |
The osmotic potential and pressure potential of three cells (A, B, C) located in different parts of an actively transpiring plant are given below Identify these three cells as root hair, root cortical and leaf mesophyll cells respectively A. A,B,CB. A,C,BC. C,A,BD. B,C,A |
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Answer» Correct Answer - C Water potentials of the given cells are A= -0.87+0.44= -0.43 B= -0.92+0.34= -0.58 C= -0.68+0.27= - 0.41 As water moves from greater water potential to less, root hair, root cortical and leaf mesophyll cells are are C,A,B respectively. |
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| 33. |
A RBC and a plant cell (with thick cell wall) are placed in distilled water. The solute concentration is the same in both the cells. What changes would be observed in themA. Both plant cell and RBCs would not undergo any changeB. The RBCs would increase in size and burst, while the plant cell would remain about the same sizeC. The plant cell would increase in size and burst, while the RBCs would remain about the same size.D. Both plant cell and RBCs would decrease in size and collapse |
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Answer» Correct Answer - B When RBCs and a plant cell are placed in distilled water, endomosis takes place in RBCs as a result of which RBCs increase in size and burst, while the plant cell would remain about the same size because endosmosis is stopped due to the presence of rigid cell wall. |
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| 34. |
Stoma opens, whenA. guard cells swell due to an increase in their water potentialB. guard cells swell by endosmosis due to influx of hydrogen ions (protons)C. guard cell swell by endosmosis due to efflux of potassium ionsD. guard cells swell due to a decrease in their water potential |
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Answer» Correct Answer - D During day time, photosynthesis occurs in guard cells, because they contain chloroplast. The soluble sugar formed by this process decreases the water potential of guard cells, resulting in stomata opening. |
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| 35. |
Which of the following is an example of imbi- bitionA. 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 | |
| 36. |
Movement of molecules of gases, liquids and solids from a region of higher concentration to a region of lower concentration is termed as Movement of particles of matter in the cell due to its own kinetic energy is calledA. DiffusionB. EvaporationC. TranspirationD. Osmosis |
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Answer» Correct Answer - A |
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| 37. |
Water vapour comes out from the plant leaf through the stomatal opening . Through the same stomatal opening carbon dioxide diffurses into the plant during photosynthesis Reason out the above statements using one of following optionsA. Both processes cannot happen simultaneously.B. Both processes can happen together because the diffusion coefficient of water and `CO_(2)` is different.C. The above processes happen only during night time.D. One process occurs during day time and the other at night. |
| Answer» Correct Answer - B | |
| 38. |
Hydathode helps inA. tanspiraitonB. guttaitonC. photosynthesisD. respiration |
| Answer» Correct Answer - b | |
| 39. |
Apolplastic movement of water in plants occurs throughA. casparin stripsB. plasma membraneC. intracellular spacesfD. plasmodesmata |
| Answer» Correct Answer - none is correct | |
| 40. |
Conversion of starch to organic acid is essential forA. Stomatal closureB. Stomatal openingC. Stomatal initiationD. Stomatal growth |
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Answer» Correct Answer - B |
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| 41. |
Match the columns and choose the correct combination `{:(a,"Relay Pump Theory ",p,"Stocking "),(b,"Transpiration-cohesioin Theory",q,"Bose"),(c,"Mass Flow Theory",r,"Godlewski"),(d,"Pulation Theory",s,"Dixon and Joly"),(,,t,"Munch"):}`A. a - r, b - q, c - t, d - pB. a - q, b - p, c - t, d - rC. a - r, b - p, c - t, d - qD. a - s, b - r, c - p, d - q |
| Answer» Correct Answer - C | |
| 42. |
Basis of stomatal opening isA. ExosmosisB. EndosmosisC. Decrease in cell sap concentrationD. Plasmolysis in guard cell |
| Answer» Correct Answer - B | |
| 43. |
Stomatal opening or closing is due toA. change in the turgidity of gurad cellsB. the inner walls of each guard cell is thick and elasiticC. celluose microfibrils of guard cell are oriented raidallyD. all of the above |
| Answer» Correct Answer - d | |
| 44. |
Stomatal opening and closing is due toA. Rise in pH of guard cells causes hydrolysis of starchB. Cytokinins and cAMP are requiredC. Abscisic acid promtes closureD. All the above |
| Answer» Correct Answer - D | |
| 45. |
Which of the following essential elements plays an important role in opening and closing of stomata?A. Iron `Fe^(+)`B. Magnesium `Mg^(2+)`C. Zinc `Zn^(+)`D. Potassium `K^(+)` |
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Answer» Correct Answer - D |
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| 46. |
Fill in the blanks A kneading of wheat flour is accompained by relase of heat which is due to of water by ______and celluslose B opening and closing of stomata depend on changes in the……………of guard cells C The wall of guard cells towrds stomatal pore is .............while the other wall is................... D guttaiton sometimes causes injury to the ...................margins by salt depostion which is left by ..........................of exudate E potometer is an apparatus used for measuringin the rate of ..................... F In land plants the water potential is never ......................because osmotic potential is always negative |
| Answer» A imbibition strach, B turgor , C thickened thin , D leaf evaporation , E transpiration , F positive | |
| 47. |
Many transplanted seedling may not survive becauseA. They do not like the new soilB. They do not get required mineral saltsC. Most of the root hairs are lost during transplantationD. The leaves get damaged |
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Answer» Correct Answer - C |
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| 48. |
At mid day hours, the xylem sap is in a state ofA. CompressionB. TensionC. RelaxationD. Adhesion |
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Answer» Correct Answer - B |
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| 49. |
In which of the following the rate of transpiration is highA. CAM plantsB. `C_(3)` plantsC. `C_(3) " and " C_(4)` plantsD. `C_(4)` plants |
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Answer» Correct Answer - b |
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| 50. |
Rate of transpiration is high inA. `C_(3)` plantsB. `C_(4)` plantsC. CAM plantsD. Both `C_(3)andC_(4)` plants |
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Answer» Correct Answer - A Rate of transpiration is high in `C_(3)` plnats. |
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