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.
| 551. |
Which enzyme is activated by zinc ?A. Nitrate reductaseB. NitrogenaseC. Alcohol dahydrogenaseD. Catalase |
| Answer» Correct Answer - C | |
| 552. |
Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormoneA. cytokininB. auxinC. ethyleneD. abscisic acid |
| Answer» Correct Answer - B | |
| 553. |
plants take zinc in form of :A. ` ZnSO_ 4 `B. `Zn^( 2 + ) `C. ZnOD. Zn |
| Answer» Correct Answer - B | |
| 554. |
Assertion: Plants obtain molybdenum in the form of molybdate ions `(MoO_(4)^(2+))` Reason: Molybdenum is a component of pollen germination, cell elongation and cell differentiation.A. If both assertio and reason are true and reason is the correct explanation of assertionB. if both assertion and reason are true but reason is not the correct explanation of assertionC. if assertion is true but reason is falseD. if both assertion and reason are false |
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Answer» Correct Answer - D Plants obtain onlybdenum in the form of molybdate ions `(MoO)_(2)^(2+)`. It is a component of several enzymes, including nitrogenase and nitrate reductase both of which participate in nitrogen metabolism. |
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| 555. |
The haemoglobin like pigment can be traced inA. seeds of legumeB. ClostridiumC. RhizobiumD. leguminous root nodules |
| Answer» Correct Answer - D | |
| 556. |
Identify the given type of hydroponic technique and select the correct option.A. A very shallow stream of water containing dissolved nutrients is recirculated past the roots of plants in a watertight channelB. The nutrient solution flows in a thin film over the roots ensuring that the upper part of the roots gets sufficient supply of oxygen.C. Roots keep suspended in the air over the nutrient solution which is provided in the form of a nutrient mist.D. Both a and b |
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Answer» Correct Answer - D The given figure represents the nutrient film technique of hydroponics. In this technique, a very shallow stream of water containing all the dissolved nutrients requried for plant growth is recirculated past the bare roots of plants in a water tight channel. the depth of the recirculating stream is very shallow (thin film) ,which ensures that the thick root and mat, which develops at the bottom of the channel, has an upper surface in sufficient supply of air/oxygen. The main advantage o f this system is that the plant roots are exposed to adequate quantities of water, `O_(2)` and nutrients. |
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| 557. |
Which of the following shows that metabolic energy is required in the absorption of ionsA. More ions absorption in presence of oxygenB. Less absorption of ions in presence of oxygenC. More ions absorption in presence of ATPD. More ions absorption in presence of NAD |
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Answer» Correct Answer - B |
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| 558. |
According to carbonic acid exchange theory of mineral salt absorption by roots, which of the following is incorrect?A. `CO_(2)` released by the respiration of roots combines with soil `H_(2)O` to form `H_(2)CO_(3)`B. `H_(2)CO_(3)` dissociates into `H^(+)` and `HCO_(3)^(-)` ions in soil solution.C. `H^(+)` ions may be exchanged for cations adsorbed on clay particles.D. Cations thus released into soil solution are adsorbed on root cells in exchange for anions (e.g., `Cl^(-)` ions.) |
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Answer» Correct Answer - D According to carbonic acid exchange theory `CO_(2)` released during respiratio of roots combines with soil water to form carbonic acid `(H_(2)CO_(3)).H_(2)CO_(3)` dissociates into `H^(+)` and `HCO_(3)^(-)` ions in soil solution. The `H^(+)` ions may get exchanged for cations adsorbed on clay particles the cations thus released into soil solution from the clay particles may et adsorbed on roots cells in exhange for `H^(+)` ions or as ions pairs with `HCO_(3)^(-)` |
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| 559. |
Stomatal movement is controlled byA. NaB. MgC. KD. P |
| Answer» Correct Answer - C | |
| 560. |
Statement l. mineral salt absortpion is an active process. II. Explanation metabolic energy is not used in active absorptionA. I is correct, II is incorrectB. I is incorrect, II is correctC. I and II both are correctD. I and II both are incorrect |
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Answer» Correct Answer - A Mineral salt absorption mainly occurs actively. Active process requires expenditure of energy. Thus, mnineral salt absorption is an energy consuming process. |
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| 561. |
Assertion: As per carbonic acid exchange theory of mineral salt absorption, `CO_(2)` released during respiration of roots forms `H_(2)SO_(3)` dissociates into `H^(+)` and `HCO_(3)` ions, where `H^(+)` ions exchange with anions adsorbed on clay particles.A. If both assertio and reason are true and reason is the correct explanation of assertionB. if both assertion and reason are true but reason is not the correct explanation of assertionC. if assertion is true but reason is falseD. if both assertion and reason are false |
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Answer» Correct Answer - C According to carbonic acid exchange theory, `CO_(2)` released during respiration of roots combines with soil water to produce carbonic acid `(H_(2)CO_(3))`. Carbonic acid dissociates into `H^(+)` and `HCO_(3)^(-)` ions in soil solution. These `H^(+)` ions may be exchanged for cations adsorbed on clay particles. the cations thsu released into soil solution from the clay particles, may be adsorbed on root cells in exchanges for `H^(+)` ions. |
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| 562. |
Theory suggesting that carbon dioxide in respiration helps in mineral absorption is calledA. Carbonic acid exchange theoryB. Contact exchange theoryC. Active mineral absorptionD. Donnan dquilibrium |
| Answer» Correct Answer - 1 | |
| 563. |
Essential mineral nutrients are the elementsA. In the absence of which plants cannot complete their life cycleB. Which cannot be replaced by other element in its functionC. Which are directly associated with the plant metabolismD. All of the above |
| Answer» Correct Answer - D | |
| 564. |
Mineral salts are translocated through (i) along with the (ii) steam of water. Which is pulled up through the plant by transpirational pull. Fill up the bhlanks in the given statements and select the correct optionA. `{:("(i)","(ii)"),("xylem","ascending"):}`B. `{:("(i)","(ii)"),("xylem","descending"):}`C. `{:("(i)","(ii)"),("phloem","ascending"):}`D. `{:("(i)","(ii)"),("phloem","descending"):}` |
| Answer» Correct Answer - A | |
| 565. |
Assertion: Some mineral nutrients are essential. Reasoning: They can be synthesized by the plants.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.C. If Assertion is true statement but Reason is false.D. If both Assertion and Reason are false statements. |
| Answer» Correct Answer - C | |
| 566. |
Mineral nutrients absorbed by roots, move to leaves throughA. xylemB. phloemC. sieve tubesD. none of these |
| Answer» Correct Answer - 1 | |
| 567. |
Mineral nutrients absorbed by roots, move to leaves throughA. xylemB. phloemC. sleve tubeD. companion cell |
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Answer» Correct Answer - A Mineral salts absorbed by the roots move laterally from epiblema to xylem through cortex, endodermis and percycle. Finally, they are transported upwards through xylem alongwith the transpiration stream. Some upward translocation of mineral salts also occurs in the phloem under certain circumstances. |
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| 568. |
All mineral slats are absorbed in cells asA. IonsB. AtomsC. MoleculesD. All the above |
| Answer» Minerals salts are absorption mostly in form of ions, i.e, anions and cations. Ions are accumulated by the plants against and cations. Ions are accumulated by the plants against and cations. Ions are accumlulated by the plants against their concentration in the soil. | |
| 569. |
Nostoc develops symbiotic relationship withA. GunneraB. virusC. AnthocerosD. Azolla |
| Answer» Correct Answer - A | |
| 570. |
Which one of the following ions is essential for photolysis of water?A. Ca and ClB. Mn and ClC. Zn and ID. Cu and Fe |
| Answer» Correct Answer - B | |
| 571. |
Which one of the following insectivorous plantsis also known as Sundew plant ?A. NepenthesB. DroseraC. UtriculariaD. Dionaea |
| Answer» Correct Answer - 2 | |
| 572. |
A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element will be replenished by doing so? |
| Answer» Azotobacter is a free living bacteria in the soil . It helps some cereal crops like maize (Zea mays) in nitrogen fixation. The farmer adds Azotobacter culture to the maize field for enhancing the nitrogen element in the soil by the process of biological nitrogen-fixation. | |
| 573. |
If the amount of an ion absorbed by a root hair cell at `0^(@) C` is `5` gm and at `20^(@)C` is `20` gm. The amount of this ion absorbed actively should beA. 25 gmB. 20 gmC. 15 gmD. 5 gm |
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Answer» At `0^(@)C`, 5 gm ions are absorbed and at `20^(@)C`, 20 gm ions are absorbed Energy is increased from`0^(@)C` to `20^(@)C`, then the increase in ion absorption amount `= 20-5 = 15` gm. |
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| 574. |
In the light of carrier concept, the transport of ion across the membrane isA. Passive processB. Non-osmotic processC. Osmotic processD. Active process |
| Answer» In this process an ATP is used up ATP molecule combine with carrier molecule and allow passage of substances against concentration gradient. | |
| 575. |
Active transport from outside to inside of molecules across a membrane requiresA. Cyclic AMPB. Acetyl chlorineC. ATPD. Phloroglucinol |
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Answer» Correct Answer - C The use of energy of ATP in transferring solutes across membrane may be through an ATP ase which creates a pH gradient across the membrane. |
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| 576. |
Active transport of ions by the cells requiresA. high temperatureB. ATPC. alkaline pHD. salts |
| Answer» Correct Answer - 2 | |
| 577. |
Passive obsorption of minerals depends onA. temperatureB. humidityC. metabolic inhibitorD. (1) and (3) |
| Answer» Correct Answer - 1 | |
| 578. |
Passive obsorption of minerals salts is not dependent onA. osmosisB. diffusionC. Donnan equilibriumD. ion exchange |
| Answer» Correct Answer - 1 | |
| 579. |
Passive obsorption of minerals salts is not dependent onA. diffusionB. osmosisC. donnam equilibriumD. ionic exchange |
| Answer» Correct Answer - B | |
| 580. |
Contact exchange of ions occursA. between root and soil particlesB. root and soil solutionC. cell and external solutionD. all of the above |
| Answer» Correct Answer - A | |
| 581. |
Leghaemoglobin is useful for legumes because itA. irreversible absorbs `O_(2)` which inhibit `N_(2)`-fixationB. reversible absorbs `O_(2)` which inhibit `N_(2)`-fixationC. protects plant tissues from damage by symbiotic bacteriaD. absorbs `O_(2)` at low oxygen tension and provides it to the tissue surrounding `N_(2)`-fixing bacteria |
| Answer» Correct Answer - B | |
| 582. |
Match the following and choose the correct combination from the options given `{:(,"Column I",,"Column II",),(A,"Potassium",1,"Constituent of ferredoxin",),(B,"Sulphur",2,"Involved in stomatal movement",),(C,"Molybdenum",3,"Needed in the synthesis of auxin",),(D,"Zinc",4,"Component of nitrogenase",):}`A. A-2, B-1 , C-4, D-3B. A-1, B-2, C-3, D-4C. A-4, B-3, C-2, D-1D. A-1, B-3, C-4, D-2 |
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Answer» Correct Answer - a |
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| 583. |
A prokaryotic autotrophic nitrogen fixing symbiont is found inA. PisumB. AlnusC. CycasD. Cicer |
| Answer» Correct Answer - C | |