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.
| 451. |
The components of water ptential areA. pressure potentialB. osmotic potentialC. matric potentialD. All of the above |
| Answer» Correct Answer - D | |
| 452. |
The water potential of an aqueous solution shall beA. zeroB. more than oneC. less than zeroD. infinite |
| Answer» Correct Answer - C | |
| 453. |
What are the two kinds of interactions of water molecues that allow water to travel upward in plnts ? What other phyusical process aids in water transport to tops of t rees ? |
| Answer» The two kinds of interactions which allow water molecules to move upward in plants ar (i)adhesion (siutcking to a sur face) and (ii)cohesion (a force holding a solid or liquid together owing to attraction between the similar molecules) The other physical process which aids in water transport to tops of trees if diffusion it results loss of twater vapours form leaves (i.e transpiratin) and results in the genreration of transpiration pulll whihc is mainly responsible for ascent of sap in tall tress | |
| 454. |
Name the special type of diffusion that helps in emergence of seedlings out of the soil. |
| Answer» Correct Answer - Imbibition. | |
| 455. |
Like many plant processes, transport of various materials in plants aot the cellular level requires all of the following exceptA. specific membrane proteinsB. passive transportC. uphill transportD. a proton gradient |
| Answer» Correct Answer - C | |
| 456. |
0.1 M solution of a solute has a water potential ofA. -2.3 barsB. 0 barC. 22.4 barsD. +2.3 bars |
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Answer» Correct Answer - A |
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| 457. |
Stomatal opening and closing due to the permeability of the guard cell. This face was revealed byA. Von MohlB. LinsbauerC. LloydD. Mansfield |
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Answer» Correct Answer - B |
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| 458. |
Root pressure develops due toA. Low osmotic potential in soilB. Passive absorptionC. Increase in transpirationD. Active absorption |
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Answer» Correct Answer - D |
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| 459. |
Stomata generally operate in response toA. Atospheric humidityB. Soil temperatureC. Atmospheric temperatureD. Light |
| Answer» Correct Answer - D | |
| 460. |
Stomatal open in the daytime due toA. Increase in water potentialB. Decrease in water potentialC. Decrease in pHD. Light |
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Answer» Correct Answer - B |
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| 461. |
Stomatal open in the daytime due toA. Decrease in pHB. Decrease in water potentialC. Increase in water potentialD. Light |
| Answer» Correct Answer - B | |
| 462. |
Suggesti two type of t reatments for reducing transpirration in plants in a field |
| Answer» Transpiration in pnlants can be reduced by spraying solution of (i) poheyl mercuric acetate `(10^(-4))` or absicisc acid (aBA) | |
| 463. |
Define imbibition. |
| Answer» Imbitbition is the phenomenon of adsorption of water or any other liquid by the solid particles of a substance wihtout forming a solution | |
| 464. |
What is wilting ? |
| Answer» Wilting is the shrinkage in the volume of water in plant cells sufficent to cause them to lose all or more of their trugor the wilting may be visible in plants as dropping rolling folding leaves or young stems | |
| 465. |
What is an isotonic solution ? |
| Answer» A solution having a concentration such that it neither gains nor loses water by somosois when separted by a semipermeable memebrane from a specified solutin | |
| 466. |
Define plasmolysis ? |
| Answer» Shrinkage of a plant cells protoplasm (away from the cell wall) when placed in a hypertonic solution as a result of osmosis is called plamolysis | |
| 467. |
Which has maximum diffusion pressure ?A. WaterB. Distilled waterC. 1 M sugar solutionD. 1 M NaCl solution |
| Answer» Correct Answer - B | |
| 468. |
Cell sap isA. a dilute solution of minerals and some organic substances in the vacuole.B. a dilute solution of minerals in water absorbed by the plant from the soil .C. exudate from the cellD. a solution of different organic substances dissolved in the cytoplasm. |
| Answer» Correct Answer - A | |
| 469. |
Which cell has maximum diffusion pressure deficit ?A. Falcid cellB. Turgid cellC. Prokaryotic cellD. Eukaryotic cell |
| Answer» Correct Answer - A | |
| 470. |
In a plant cell, the diffusion pressure deficit is zero when it isA. plasmolysedB. turgidC. flaccidD. incipient |
| Answer» Correct Answer - B | |
| 471. |
Hydathodes help inA. BleedingB. GuttationC. Protection against grazingD. More than one option is correct |
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Answer» Correct Answer - B |
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| 472. |
Find the correct expression for a fully turgid cellA. `Psi_(W)=Psi_(S)`B. `Psi_(W)=0`C. `Psi_(W)=Psi_(s)+Psi_(P)`D. `Psi_(W)=Psi_(P)` |
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Answer» Correct Answer - B |
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| 473. |
Select an incorrect statementA. Guard cells are dumb-bell shaped in monocotsB. Inner wall of the guard cell is thin and elastic in dicotsC. Cellulosic microfibriles are arranged radilly in guard cellsD. Guard cells ar surrounded by subsidiary cells |
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Answer» Correct Answer - B |
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| 474. |
How does most of the water moves within the root ? |
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Answer» Most of the water flow in the ocurr via the apoplast pathway since, the cortical cells are loosly packed and hence offer no resistance to water movement, which is through mass flow. This mass flow of water occurs due to adhesive and cohesive properties of water occurs due to adhesive and cohesive properties of water. However, symplast pathway is also involved in the movement of water molecules within the root (i.e, via andodermis to xylem). |
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| 475. |
For the same amount `CO_(2)` fixed s `C_(4)` plant, in comparison with a `C_(3)` plants, lose onlyA. Half amount of waterB. Double amount of waterC. Equal amount of waterD. None of the above |
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Answer» Correct Answer - A For the same amount of `CO_(2)` fixed, a `C_(4)` plant as compared to `C_(3)` plant loses only half amount of water. |
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| 476. |
The `C_(4)` plants are twice as efficient as `C_(3)` plants in terms of fixing `CO_(2)` but lose only ...... as much water `C_(3)` plants for the same amount of `CO_(2)` fixed. |
| Answer» Half, The evolution of the `C_(4)` or plants photosynthetic system is probably one of the stategies for maximising the ability of `CO_(2)` while minimising water loss. `C_(4)` plants are twice as efficient as `C_(3)` plants in terms of fixing carbon in the form of glucose, but lose only half as much water as a `C_(3)` plant for the same amount of `C_(2)` fixed. | |
| 477. |
The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificty of transport of transport of substances is mostly across the cell membrane, because |
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Answer» The transport takes place by the cell membrane because cell membrane is semi-permeable and composed of liquids that are arranged in bilayer structure along with proteins and carhydrate. The lipid soluble molecules pass readily across lipid bilayer of cell membrane whereas novement of other molecules of small size is facilitated by porins, pores made up of proteins. while cell wall does not helps in transport of substances because it. Cell wall is basically a non-living rigid structure forming outer covering over plasma membrane and it provides shape, mechanical strength and protection of the plant cell from damages and infection. |
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| 478. |
Rate of water absorption generally follows closely the rate ofA. TranspirationB. PhotosynthsisC. RespirationD. Growth |
| Answer» Correct Answer - A | |
| 479. |
The phenomenon related to active water absorption isA. TranspirationB. Root pressureC. Osmotic pressureD. Translocation |
| Answer» Correct Answer - B | |
| 480. |
Force for active water absortion is present inA. XylemB. Aerial partsC. RootD. Root hairs |
| Answer» Correct Answer - C | |
| 481. |
Active tramsportA. uses energy to pump molecules against the concentration gradientB. is as active processC. is carried out by membrane proteinsD. all of these. |
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Answer» Correct Answer - D Active transport is the transport of solute linked with some metabolic reaction (or reactions) involving expenditure of energy. The molecules or ions, in active transport, cross a protplasmic membrane (viz, plasma membrane, tonoplast, etc.) against the chemical potential (concentration) gradient. This kind of transport is carried out by membrace proteins. |
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| 482. |
Why the blood is stored in isotonic saline water? |
| Answer» Blood is stored in isotonic saline water to avoid haemotlysis haemolysis is the rupture of red blood cells (e.g through osmotic shock ) with release of haemoglobin .It occurs when blood is stored in pure water | |
| 483. |
Grafted flower is contained in saline water becauseA. Suitable nutrient available to flowerB. Flower become fresh in long duration due to loss transpirationC. Flower become fresh in long duration due to regulated osmotic pressure of flower cellD. Flower is protected by microbes |
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Answer» Correct Answer - B |
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| 484. |
Force of cohesion develops due toA. Attraction between similar moleculesB. Attraction between different moleculesC. Surface tension at the interfaceD. All the above |
| Answer» Correct Answer - A | |
| 485. |
Force of cohesion develops due toA. Attraction between similar moleculesB. Attraction between different moleculesC. Surface tension at the interfaceD. All of the above |
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Answer» Correct Answer - A Force of cohesion develops due to attraction between similar molecules |
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| 486. |
The process of osmosis involvesA. Movement of solute through semipermeable membraneB. Movement of solvent through a semipermeable membraneC. Movement of solution through a semipermeable membraneD. None of the above |
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Answer» Correct Answer - B |
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| 487. |
Osmosis involvesA. flow of water without a membraneB. flow of solute from a semipenmeable membraneC. flow of solvent `(H_(2)O)` through a semipermeable membraneD. None of the above |
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Answer» Correct Answer - C Osmosis is the flow of solvent from a more concentrated solution to a less concentrated solution through a semipermeable membrane. |
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| 488. |
Which of the following is not the purpose of transpiation?A. Supplies water for photosynthesisB. Maintains shape and structure of plantsC. Helps in translocation of sugar from source to sinkD. Transports minerals from soil to all parts of the plant |
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Answer» Correct Answer - C C |
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| 489. |
Opening of stomata is not affected byA. `N_(2)`B. `K^(+)` ionsC. StarchD. None of these |
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Answer» Correct Answer - A Opening of stomata is not affected by `N_(2)` (nitrogen). `N_(2)` is present in free state in atmosphere, which is used in nitrogen fixation by some important bacteria, but does not affect opening and closing of stomata. |
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| 490. |
Keep some freshly cut flowers in a solution of food colour. Wait for sometime for the days to rise in the flower, when the stem, of the flower is held up in light, coloured strands can be seen inside. Can this experiment demonstrate which tissue is conducting water up the stem ? |
| Answer» Yes, it shows that xylem tissue conducts water. | |
| 491. |
Osmotic pressure of a solution isA. greater than that of pure solventB. less than that of pure solventC. equal to that of pure solventD. less than or greater than that of pure solvent |
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Answer» Correct Answer - A Osmotic pressure of a solutionis greater than that of pure solvent, when a solution is separated from pure solvent by a semipermeable membrane, the solvent begins to flow towards the solution due to the development of osmotic pressure. |
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| 492. |
Cut flowers are dipped basally in diluta sodium chloride solution toA. Reduce bacterial growthB. Reduce transpirationC. Induce endosmosisD. Increase solute inside flowers |
| Answer» Correct Answer - B | |
| 493. |
If floweres are cut and dipped in dillute NaCI solution thenA. transpiration is lowB. endosmosis occursC. no bacterial growth occursD. absorption of solute inside flower cell takes place |
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Answer» Correct Answer - B Dilute NaCl solution acts as hypotonic solution so, when flowers are cut and dipped in dilute NaCl solution, endosmosis occurs and the cells of flower swell. |
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| 494. |
A cell swells up when kept inA. hypotonic solutionB. hypertonic solutionC. isotonic solutionD. All of the above |
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Answer» Correct Answer - A When a cell is placed in a hyptomnic solution, water movement takes place towards cells (because of high solute concentration) and it swells up. |
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| 495. |
What is root pressure ? |
| Answer» The positive hydrostatic pressure found in the xylem due to metabolic activity of roots. | |
| 496. |
What is the bulk or mass flow hypothesis ? |
| Answer» Mass or bulk flow hypothesis refers to the movement of substances in bulk from one region to another due to the presence of pressure differences between them. | |
| 497. |
The bulk movement of substanes through the conducting or vascular tissues of plants is called _______ |
| Answer» Correct Answer - Translocation | |
| 498. |
Select the incorrect statement w.r.t. imbibitionA. It is diffusion processB. Affinity between the adsorbent and the liquid is not a pre-requisiteC. It involves both capillary action and adsorptionD. Phycocolloids are best imbibants |
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Answer» Correct Answer - B |
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| 499. |
Water is absorbed along with mineral solutesm, by the root harisA. Partly by diffusion and partly by active transportB. Partly by facilited diffusion and partly by active transportC. Purely by diffusionD. Purely by active transport |
| Answer» Water is abosrbed along with mineral solutes, by the root hairs purely by diffusion. | |
| 500. |
Select the incorrect statement regarding imbibition.A. Imbibition is the phenomenon of adsorption of water or any other liquid without forming solutionB. The liquid which is imbibed is called as imbibate.C. There occus a decrease in volume of imbibant during imbibition.D. water is absorbed by germinating seeds through imbibtion. |
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Answer» Correct Answer - C the adsorption of water by the solid particles or an adsorbent causing it to enormously increase in volume without forming a solution is called imbibition. Solid substances or adsorbent which take part in imbibition are called imbibants `e.g,` seeds dry wood the liquid (usually water) which is imbibed is known as imbibate. the imbibate is held in between and over the surface of particles of the solid substance through the processes of capillarity and adsorption . the swelling imbibant also develops a pressure called imbibition pressure (matric potential). |
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