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.
| 801. |
Is it possible to perform girdling experiments in monocotes? Give reasons in support of your answer |
| Answer» It is not possible to perform girdling experimmnets in monocots in monocot s the vascular bundles are scattered in the ground tissure therfore conitiuity of cascular tissure is not disturebed by removing the outer layer girdling is usually dine in woody stems of dicots wher collateral vascular bundles are arranged in one ring in such stems it is posssible to remove all the tissure outer ot vascular cambuium (barck , corted and phloem) | |
| 802. |
Which of the following is appropriate for mass-flow hypthesis ?A. Transpiration pull is responsible for absorption of ionsB. Large amount of ions are also absorbed along with the absorption of waterC. As suction pressure increases, absorption of water increases and along with water absorption of ion also increasesD. All of the above |
| Answer» Correct Answer - D | |
| 803. |
Water potential of pure water at standard temperature is equal toA. tenB. twentyC. zeroD. None of these |
| Answer» Correct Answer - C | |
| 804. |
Water potential of pure water at standard temperature is equal toA. `10`B. `20`C. zeroD. none of these. |
| Answer» Correct Answer - C | |
| 805. |
Water potential of pure water at standard temperature is equal toA. 10B. 20C. zeroD. None of these |
| Answer» Water potential of pure water at standard temperature is zero. It is the highest value of water potential. | |
| 806. |
Match the followings and choose the correct optionA. A-(iii),(B)-(iv),(C )-(i),(D)-(ii)B. A-(i),(B)-(ii),(C )-(iii),(D)-(iv)C. A-(iii),(B)-(ii),(C )-(iv),(D)-(i)D. A-(iii),(B)-(ii),(C )-(i),(D)-(iv) |
| Answer» Correct Answer - b | |
| 807. |
Based on the figure given below which of the following statements is not correct A. Movement of solvent molecules will take place from chamber A to BB. Movement of solute will take place from A to BC. Presence of a semipermeable is a pre-requisite for this process to occurD. The direction and rate of osmosis dpends on both the pressure gradient and concentration gradient |
| Answer» Movement of water will take place from chamber A to B. It is not the solute which will move from chamber A to B. The is because osmosis is a process in which solvent molecules moves from a region of higher concentration to a region of lower concentration through a semi-permeable membrane. | |
| 808. |
Based on the figure given below which of the following statements is not correct A. movement of solvent moleculces will take place form chamber a to bB. movement of solute will take place from a to bC. presence of a semipermeable is a pre requiesite for this process to occurD. the direction and rate of osmosis depends on both the pressure gradient and concentration gradietn |
| Answer» Correct Answer - b | |
| 809. |
Choose the correct option Mycorrhiza is a symbiotic association of fungus with root system which helps in `A`. absorption of water `B`. mineral nutrition `C.` translocation `D`.gaseous exchange.A. only aB. onlybC. both a and bD. both b and c |
| Answer» Correct Answer - c | |
| 810. |
Choose the correct option Mycorrhiza is a symbiotic association of fungus with root system which helps in `A`. absorption of water `B`. mineral nutrition `C.` translocation `D`.gaseous exchange.A. absorption of waterB. mineral nutritionC. translocationD. gaseous exchange |
| Answer» Mycorrhiza associated with roots of plants helps in both absorption of water and minerals from the soil. The other options are incorrect. | |
| 811. |
Choose the correct option Mycorrhiza is a symbiotic association of fungus with root system which helps in `A`. absorption of water `B`. mineral nutrition `C.` translocation `D`.gaseous exchange.A. Only`A`B. Only`B`C. Both `A` and `B`D. Both `B` and `C` |
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Answer» Correct Answer - C The roots of some higher plants are associated with fungal mycellia. Such an association is called nycorrhiza. It represents a mulualistic (symbiotic) association between the roots system of higher plants and fungal hyphae.The fungal hyphae form a network around the young root and invade the root cells. The extrnal hyphae greatly increase the surface area for absorption of minerals and water from a much larger volume of soil that perhap the roots alone cannot do. |
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| 812. |
Based on the figure given below which of the following statements is not correct A. Movement of solvent molecules will take place from chamber `A`to `B`.B. Movement of solute will take place from `A` to `B`C. Presence of a semi-permeable is a per- requisite for this process to occur.D. the direction and rate of osmosis depends on both the pressure gradient and concentration gradient. |
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Answer» Correct Answer - B Solution A and solution B are separated by a semi-permeable membrane. Solution A has higher water potential. Therefore, osmotic movement of water molecules (solvent molecules) will occur from solution A to B solution particles cannot pass through semi-peemeable membrane. |
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| 813. |
Ascent of sap isA. Upward movement of water in the plantB. Downward movement of organic nutrientsC. Upward and downward movement of water in the plantD. Redistribution of inorganic substances in the plant |
| Answer» Correct Answer - A | |
| 814. |
Upward movement of water through xylem is best explained byA. Cohesion theoryB. Pulsation theoryC. Capillarity theoryD. Root pressure theory |
| Answer» Correct Answer - A | |
| 815. |
Rising column of water does not break its connection with xylem walls despite negative pressure or tension due toA. Cohesion amongst water moleculesB. Strong transpiration pullC. AdhesionD. Surface tension |
| Answer» Correct Answer - C | |
| 816. |
Fill in the blanks: (1) Despite the absence of a heart or a circulatory system in plants the flow of water upward through the xylem in plants can achieve fairly high rates up to .....a.....metres per hour. (2) Less than .....b...... Percent of the water reaching the leaves is used in photpsynthesis and plant growth. (3) Water loss from a leaf can be studied by using ......c...... . (4) Most researchers agree that water is mainly .....d..... through the plant.A. a-10, b-5, c-potato osmometer, d-pushedB. a-5, b-10, c-cobalt chloride paper, d-pulledC. a-15, b-1, c-cobalt chloride paper, d-pulledD. a-10, b-1, c-cobalt chloride paper, d-pushed |
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Answer» Correct Answer - C Despite the absence of a heart or a circulatory system in plants, the flow of water upward through the xylem in plants can achieve fairly high rates up to 15 meters per hour Less than 1 precent of the water reaching the leaves is used in photosynthesis and plant growth Water loss from a leaf can be studied by using cabalt chloride paper Most reserchers agree that water is mainly pulled through the plant |
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| 817. |
What happens when concentration of solutes decreses in guard cellsA. Water potential increasesB. Osmotic pressure increasesC. Water potential decreasesD. None of the above |
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Answer» Correct Answer - A A decrease in solute concentration in guard cells will cause decrease in solute potential and thus, an increase in the water potential. |
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| 818. |
Osmotic pressure of a solution isA. More then that of pure solventB. Less than that of pure solventC. Variable depending upon concentrationD. Equal to thet of pure solvent |
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Answer» Correct Answer - A Osmotic pressure of a solution is always higher then that of pure water. However, osmotic potential is always negative or less than that of pure water. |
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| 819. |
Cobalt- Chloride test is for demonstration ofA. ImbibitionB. TranspirationC. guttationD. More than one option is correct |
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Answer» Correct Answer - B |
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| 820. |
Cohesion theory of ascent of sap was proposed byA. MunchB. Stephen HalesC. Dixon and JolyD. Bose |
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Answer» Correct Answer - C Cohesion theroy of ascent of sap was proposed by Dixon and Joly. |
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| 821. |
When stomata open only at night they are calledA. photoactive stomataB. scotoactive stomataC. nyctinastic stomataD. All of these |
| Answer» Correct Answer - B | |
| 822. |
Match the column I and with column II A. 1-D,2-A,3-B,4-CB. 1-A,2-D,3-B,4-CC. 1-D,2-B,3-C,4-AD. 1-A,2-B,3-C,4-D |
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Answer» Correct Answer - a |
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| 823. |
Guttation only occurs inA. HydrophytesB. mesophytic herbsC. MangrovesD. marshy plants |
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Answer» Correct Answer - b |
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| 824. |
Guttation occurs whenA. Wind velocity is highB. Humidiy increasesC. Root pressure is less nad transpiration rate is moreD. Root pressure is more transpiration rate is less |
| Answer» Correct Answer - D | |
| 825. |
Complementary cells are associated withA. lenticelsB. hydathodesC. rhytidomeD. bark |
| Answer» Correct Answer - A | |
| 826. |
Transpiration can be influenced by interfering withA. Air temperatureB. Epidermis of leafC. Guard cellD. Osmotic pressure |
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Answer» Correct Answer - A |
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| 827. |
Which would do maximum harm to treeA. Loss of half of its branchesB. Loss of all of its leavesC. Loss of all its barkD. Loss of half of its leaves |
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Answer» Correct Answer - D |
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| 828. |
Osmosis isA. passage of solvent only through a semipermeable membraneB. passage of solutes only through a membraneC. passage of both solvent and solute through a membraneD. passage of solution through a protoplasm. |
| Answer» Correct Answer - A | |
| 829. |
A column of water within xylem vessels of tall trees does not break under its weight because ofA. Positive root pressureB. Dissolved sugar in waterC. Tensile strength of waterD. Lignification of xylem vessels |
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Answer» Correct Answer - C |
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| 830. |
A : Pumps are proteins that use energy to transport substances . R : Pumps are highly specific like enzyme .A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)C. Assertion is true statement but Reason is false, then mark (3)D. If both Assertion and Reason are false statements , then mark (4) |
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Answer» Correct Answer - B |
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| 831. |
Explain why pure water has the maximum water potential. |
| Answer» Water potential quantifies the tendency of water to move from one part to the other during various cellular processes. It is denoted by the Greek letter Psi or `psi` . The water potential of pure water is always taken as zero at standard temperature and pressure. It can be explained in terms of the kinetic energy possessed by water molecules. When water is in liquid form, the movement of its molecules is rapid and constant. Pure water has the highest concentration of water molecules. Therefore, it has the highest water potential. When some solute is dissolved in water, the water potential of pure water decreases. | |
| 832. |
The diameter of stomatal pore ranges betweenA. `25-50 mu`B. `15-25 mu`C. `3-10 mu`D. `1-2 mu` |
| Answer» Correct Answer - C | |
| 833. |
Bordered pits relating with water uptake located inA. CortexB. EndodermisC. Vessel elements (Xylem duct)D. Tracheary elements |
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Answer» Correct Answer - D |
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| 834. |
The process of guttation takes placeA. When the root pressure is high and the rate of transpiration is lowB. When the root pressure is low and the rate of trasnpiration is highC. When the root pressure equals the rate of trasnpirationD. When the root pressure as well as rate of transpiration are high |
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Answer» Correct Answer - a |
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| 835. |
Which is a correct order ( w.r.t. imbibing capacity in decreasing order ) ?A. Agar-agar ` gt` Pectin `gt ` Protein `gt` Starch `gt` CelluloseB. Agar-agar `gt` Protein `gt` Pectin `gt` Cellulose `gt` StarchC. Protein `gt` Agar-agar `gt` Pectin `gt` Starch `gt ` CelluloseD. Agar-agar `gt` Starch ` gt` Protein `gt` Cellulose `gt` Pectin |
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Answer» Correct Answer - A |
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| 836. |
The principle pathways by which water is translocated in angiosperm isA. Xylem and phloem togetherB. Sieve tubes and members of phloemC. Sieve cells of phloemD. Xylem vessel system |
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Answer» Correct Answer - D |
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| 837. |
What is facilitated diffusion ? |
| Answer» It is movement of substances across the membrane with the help of membrance proteins , but without the expenditure of energy . | |
| 838. |
What is diffusion pressure ? |
| Answer» The pressure exerted by molecules ( i.e., gases, liquids or solids ) with the tendency to diffuse from the region of their hiher concentration to the region of their lower concentration is known as diffusion pressure. | |
| 839. |
Give one example of diffusion in plants . |
| Answer» In plants, release of oxygen and uptake of carbon dioxide occurs through stomata , due to diffusion. | |
| 840. |
Resurrection plants of Selaginella and lichens remain air dry for considerable periods because they can absorb water from the slight downpour. By which physiological process water is absorbedA. active absorption plasmolysisB. plasmolysisC. ImbibitionD. osmosis |
| Answer» Correct Answer - C | |
| 841. |
According to Sayere and Scarth, the opening and closing of stomata is governed byA. temperatureB. enzymesC. hydrolysis of starchD. `NADPH_(2)` formation |
| Answer» Correct Answer - C | |
| 842. |
Transpiration is dependent uponA. Difference of vapour pressureB. Degree of stomatal openingC. Availability of green light.D. Both A and B. |
| Answer» Correct Answer - D | |
| 843. |
Observe the diagram and answer the following. (a) Are these types of guard cells found in monocots or dicots ? (b) Which of these shows a higher water content (i) or (ii) ? (c) Which element plays an important role in the opening and closing of stomata ? |
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Answer» (a) The guard cells are bean-shaped which are found in dicot plants. (b) The guards cells in figure (i) are turgid as, they pull the inner wall of the cell outside thus, they have more water. (ii) cells are flacid, this condition results when cells lose water and close stomatal pore. (c) The `K^(+)` ions when move from neighbouring cells to guards cells, lowering their water potential as a result the water moves inside inside making them turgid and thus opening stomata. |
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| 844. |
In rainy season, the doors get wet due toA. ImbibitionB. AbsorptionC. DiffusionD. Endosmosis |
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Answer» Correct Answer - A |
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| 845. |
Observe the given figure and identify the process (I) and (II) |
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Answer» I= Uniport II= Symport |
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| 846. |
Osmosis is helpful to plant becauseA. Growth of the young cells is brought about by osmotic pressure and turgor pressure of these cellsB. Certain turgor moments in plants are determined by osmosisC. Both (a) and (b)D. None of these |
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Answer» Correct Answer - C |
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| 847. |
High `CO_(2)` concentration in leaf interior will causeA. Stomatal openingB. Stomatal closureC. No effect on stomataD. Stomata are destroyed . |
| Answer» Correct Answer - B | |
| 848. |
Assertion root cells have lower water potential than leaf cellls Reason root cells have greater solute concentrationA. 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 | |
| 849. |
Increase in `CO_(2)` concentration around leaf results inA. Rapid opening of stomataB. Parital closing of stomataC. Complete closure of stomataD. There will be no effect on stomatal opening |
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Answer» Correct Answer - B |
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| 850. |
_____ can not cause net transport of molecules from low to high concentration . |
| Answer» Facilitated diffusion | |