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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.
| 501. |
Which of the following plant diseases is caused by mineral deficiency?A. Heart rot of beetsB. White rustC. Red rot of sugarcaneD. Wilt in cotton |
| Answer» Correct Answer - 1 | |
| 502. |
Necrosis mainly occurs by the deficlency ofA. Ca, MgB. N, SC. Mn, MoD. Fe, Mn |
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Answer» Correct Answer - A Nacrosis is browning or blackening of tissue due to the death of a cell or group of cells, while still a part of the plant is living. It occurs due to the deficiency of calcium `(Ca^(2+))` magnesium `(Mg^(2+))`, copper (Cu) and potassium (K). |
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| 503. |
A plant requires calcium forA. holding its cells togetherB. synthesizing chlorophyllC. photolysis of waterD. opening and closing its stomata |
| Answer» Correct Answer - 1 | |
| 504. |
Death of stem and root tips occurs due to the deficiency ofA. phosphorusB. nitrogenC. calciumD. carbon |
| Answer» Correct Answer - 3 | |
| 505. |
Minerals are absorbed by the roots from the soil in the form ofA. compoundsB. very concentrated solutionC. in the form of ionsD. in the form of molecules. |
| Answer» Correct Answer - 3 | |
| 506. |
Minerals absorbed by roots move to the leaf throughA. xylemB. phloemC. sieve tubesD. none of these |
| Answer» Correct Answer - 1 | |
| 507. |
Minerals absorbed by roots move to the leaf throughA. xylemB. phloemC. sieveD. tubes |
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Answer» Correct Answer - A Minerals ions accumulated in the root hairs passes into the cortex ad finally reach the xylem from where these are carried along with water to other parts of the plant along the transpiration stream. Like organic solutes, minerals can move upwards, downwards (bidirectional movement) as well as laterally. |
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| 508. |
Minerals are absorbed by a plant from the soil by a processA. Independent of water absorptionB. Dependent on water absorptionC. Dependent on strength of solutionD. Dependent on osmosis |
| Answer» Maximum mineral salt absorption occurs by zone of elongation. No mineral salt absorpton occur by root hair zone. Mineral salt absorption occurs directly by cells of epoblema and not by root hair. | |
| 509. |
Minerals known to be required in large amounts for plant growth includeA. magnesium, sulphur, iron, zincB. phosphorus, potassium, sulphur, calciumC. calcium, magnesium, manganese, copperD. potassium, phosphorus, selenium, boron |
| Answer» Correct Answer - B | |
| 510. |
Enzyme involved in nitrogen assimilationA. nitrogenaseB. nitrate reductaseC. transferaseD. trasaminase |
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Answer» Correct Answer - A In the process of biological nitrogen fixation, the dinitrogen molecule is reduced by the addition of pairs of hydrogen in the presence of enzymes nitrogenase. Enzyme nitrate reductase and nitrite reductase come into picture at later state (for nitrate assimilation). |
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| 511. |
Enzyme involved in nitrogen assimilationA. nitrogenaseB. nitrate reductaseC. transferaseD. transaminase |
| Answer» Correct Answer - 2 | |
| 512. |
Nitrate reductase formsA. `N_(2)`B. `NH_(3)`C. `NO_(2)`D. `NO_(3)` |
| Answer» Correct Answer - 3 | |
| 513. |
If by radiation all nitrogenase enzyme are inactivated, then there will be no:-A. Fixation of nitrogen in legumesB. Fixation of atmospheric nitrogenC. Conversion from nitrate to nitrite in legumesD. Conversion from ammonium to nitrate in soil |
| Answer» Correct Answer - A | |
| 514. |
If by radiation all nitrogenase enzymes are inactivated then there will be noA. fixation of atomspheric nitrogenB. conversion from nitrate to nitrite in legumesC. conversion from ammonium to nitrate in soilD. fixation of nitrogen in legumes |
| Answer» Correct Answer - 4 | |
| 515. |
generally plant hat have symbiotic relations with `N_(2)`-fixing bacteria,plant receive from the bacteriaA. ammoniumB. oxygemC. nitatesD. hydrogen |
| Answer» Correct Answer - C | |
| 516. |
Mycorrhiza is a mutualistic association. How do the organisms involved in this association gain from each other ? |
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Answer» A mycorrhiza is a symbiotic association between a fungus and the roots of vascular plants (mainly gymnosperms). This mutualistic association provides fungus a constant and direct supply of carbohydrates (glucose and sucrose). In return, plant gains the benefit of the mycelium of fungus which enhances its absorptive capacity for water and minerals due to the large surface area of mycelium. |
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| 517. |
Plants that have mutualistic relations with nitrogen-fixing bacteria receive from the bacteriaA. ammoniumB. amino acidsC. nitrateD. nitrite |
| Answer» Correct Answer - 1 | |
| 518. |
Plants that have mutualistic relations with nitrogen-fixing bacteria provide the bacteria withA. `N_(2)`B. enzymesC. sugarsD. nitrite |
| Answer» Correct Answer - 3 | |
| 519. |
Plants require sulphur forA. DNA replicationB. Protein synthesisC. Glucose synthesisD. ATP formation |
| Answer» Correct Answer - 2 | |
| 520. |
Plants require sulphur forA. ATP synthesisB. protien synthesisC. glucose synthesisD. DNA replication |
| Answer» Correct Answer - B | |
| 521. |
Premature leaf fall is due to deficiency ofA. phosphorusB. calciumC. ironD. Both (a) and (b) |
| Answer» Correct Answer - A | |
| 522. |
Nodules with nitrogen fixing bacteria are present inA. CottonB. GramC. WheatD. Mustard |
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Answer» Correct Answer - B |
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| 523. |
The technique of hydroponics was first demonstated by |
| Answer» Correct Answer - Julius Von Sachs | |
| 524. |
Assertion: The technique of growing plants in a nutrient solution is known as hydroponics Reason: Hydroponics is used for commercial production of vegetables such as tomato, seedless cucumber and lettuce.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 - B The soilles production of plants is called hydroponics. Solution culture is used for raising soilless flowers and vegetables. Plants are raised in small tanks of concrete or metal. The upper covering has supports for plants. The narrow tanks are provided with nutrient solution a pump circulates air as well as nutrient solution. roots of the plants are therefore regularly provided with aerated nutrient solution hydroponics is useful in areas having thin. infertile and dry soils. out of season vegetables like tomato, seedless cucumber, lettuce and flowers can also be obtained using this techinque. |
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| 525. |
Hydroponics have been shown to be a successful technique for growing of plants. Yet most of the crops are still grown on land . Why ? |
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Answer» Although, hydrophonics is a successful technique for plants still many crops are grown on land because (i) The cost is the major concern. The setting and handling of hydrophonics requires much more investment than that of the soil based production . (iii) Sanitization is extremely important especially with indoor hydroponic environments. Water borne disease can spread quickly through some methods of hydroponic production. (iv) Plants are less adaptable to the surrounding atmosphere. Hot weather and narrow oxygenation may minimise the production and quality of plant produce/yield. |
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| 526. |
Mark the correct sequence of steps for the development of root nodules in legumesA. Formation of infection threadB. Division of cortical and pericyclic cells.C. Curing of root hairs.D. Leghaemoglobin synthesis. |
| Answer» Correct Answer - D | |
| 527. |
Which of the following is/are diazotrophs?A. Rhizobium and AzotobacterB. Frankia and KlebsiellaC. Anbaena and NostocD. All of these |
| Answer» Correct Answer - D | |
| 528. |
Which is not true for nitrogenase enzyme in root nodules in legumes?A. Synthesized by nit genes of RhizobiumB. Site of reduction of `N_(2) " into " NH_(3)`C. It is a Mo-Fe proteinD. Resistant to `O_(2)` concentration |
| Answer» Correct Answer - B | |
| 529. |
Guard cells help inA. Fighting against infectionB. Protection against grazingC. TranspirationD. Guttation |
| Answer» Correct Answer - C | |
| 530. |
The limiting factor in nitrogen fixation of soil isA. soil natrure (pH)B. lightC. temperatureD. air |
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Answer» Correct Answer - A Extreme of soil pH affects nodulation by reducing the colonisation of soil and the legume rhizosphere by rhizobia. Highly acidic soils `(pH lt 4.0)` frequently have low levels of phosphorus, calcium and molybdenum and high concentration of toxic elements while highly alkaline soils `(pH gt 8.0)` tend to be high in sodium chloride, bicarbonate and borate, and are often associated with high salinity which reduce nitrogen fixation. |
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| 531. |
The plants grown in magnesium deficent but urea sprayed soil would showA. deep green foliageB. early floweringC. yellowing of leavesD. loss of pigments in petals |
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Answer» Correct Answer - C Nitrogen is the constituent of amino acids, proteins, nucleic acids, nucleotides, coenzmes, hexosamines nucleic acids, nucleotides, coenzymes, hexosamines etc. Deficiency of nitrogen rapidaly inhibits the plant growth and yellowing of the leaves (chlorosis) magnesium has the specific role in the activation of enzymes, taking part in photosynthesis and respiration. It also forms a part of the ring structure of the chlorophyll molecule. Deficiency of Mg causes chlorosis i.e., yellowing of leaves. Thus a plant growing in magnesium-deficient soil would show chlorosis inspite of being sprayed with urea (nitrogen). |
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| 532. |
Which of the following is essential mineral element and is not a constituent of any enzyme but stimulate the activity of many enzymesA. ZnB. MgC. MnD. K |
| Answer» According to Webster (1953) potassium is activator of more than 40 enzymes connected with phosphorylation, photosynthesis, starch synthesis, respiration, synthesis of chlorophyll, DNA and proteins | |
| 533. |
Which one of the following is not an essential mineral element for plants while the remaining three areA. IronB. ManganeseC. CadmiumD. Phosphorus |
| Answer» Correct Answer - 3 | |
| 534. |
An element playing important role in nitrogen fixation isA. ManganeseB. ZincC. MolybdenumD. Copper |
| Answer» Correct Answer - C | |
| 535. |
Which one of the following is not an essential mineral element for plants while the remaining three areA. CadmiumB. PhosphorusC. IronD. Maganese |
| Answer» Correct Answer - A | |
| 536. |
An element playing important role in nitrogen fixation isA. MolybdenumB. CopperC. ManganeseD. Zinc |
| Answer» Correct Answer - A | |
| 537. |
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct for this process of nitrogen fixation ?A. Nodules act as sites for nitrogen fixation.B. The enzyme nitrogenase catalyses the conversion atmospheric `N_(2) " to NH_(3)`.C. Nitrogenase is is insensitive to oxygen.D. Leghemoglobin scavenges oxygen and is pinkish in color. |
| Answer» Correct Answer - C | |
| 538. |
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct for this process of nitrogen fixation ?A. Leghaemoglobin scavenges oxygen and is pinkish in colourB. Nodules act as sites for nitrogen fixationC. The enzyme ntirogenase catalyses the conversion of atmospheric ` N_ 2 ` to ` NH_ 3 `D. Nitrogenase is insensitive to oxygen |
| Answer» Correct Answer - D | |
| 539. |
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?A. Leghaemoglobin scavenges oxygen and is pinkish in colourB. Nodules act as sites for nitrogen fixationC. The enzyme nitrogenase catalyses the conversion of atmospheric of atmospheric `N_(2)` to `NH_(3)`D. Nitrogenase is insensitive to oxygen |
| Answer» Correct Answer - 4 | |
| 540. |
Find a correct setm of requirements to fix a molecule of atmospheric nitrogen (`N_2`)A. `8e^(-), 8H^(+), 8ATP `B. ` 16e^(-), 16H^(+), 16ATP `C. `8e^(-), 8H^(+), 16 ATP `D. ` 16 e ^(-), 16 H ^(+), 8 ATP ` |
| Answer» Correct Answer - C | |
| 541. |
Which of the following does not fix atmospheric nitrogen?A. NostocB. AnabaenaC. SpirogyraD. Azotobacter |
| Answer» Correct Answer - C | |
| 542. |
Which of the following association fix nitrogen through non-nodulation?A. roots of maize associated with spirillum notatumB. roots of digitaria in association with spirillum notatumC. coralloiod roots of cycas is associated with anabaenaD. all of the above |
| Answer» Correct Answer - D | |
| 543. |
Go through the following matches with reference to the elements and their deficiency symptoms in plants: (i) Sulphur - Reduced nodulation in legumes (ii) Boron - Whiptail disease (iii) Sulphur - Blossom end root of tomato (iv) Nitrogen - Wrinkling of cereal grains Which of these are correctA. (i), (ii) & (iii)B. (i) & (iii)C. (ii), (iii) & (iv)D. (i) & (iv) |
| Answer» Correct Answer - 4 | |
| 544. |
Read the following matches regarding the elements and their deficiency symptoms in plants (i) Molybdenum - Brown heart of turnip (ii) Potassium - Plastid disintegration (iii) Magnesium - Underdeveloped phloem & pith (iv) Phosphorus - Delay in seedgermination Which of these are correctA. (i), (iii) & (iv)B. (ii), (iii) & (iv)C. (i), (ii) & (iii)D. (iii) & (iv) only |
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Answer» Correct Answer - 2 Brown heart of turnip is caused by deficiency of Boron. |
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| 545. |
Deficiency of molybdenum causeA. Poor development of vasculatureB. Bending of leaf tipC. Yellowing of leavesD. Mottling and necrosis of leaves |
| Answer» Mottled chlorosis with marginal necrosis and infolding, lamina or upper half of lamina falls down (whiptal disease) due to the deficiency of molybdenum. | |
| 546. |
Deficiency of molybdenum causesA. wilting of plantB. increase in growth of plantC. mottled chlorosisD. mottling and necrosis plant |
| Answer» Correct Answer - A | |
| 547. |
Molybdenum is involved in plant metabolism inA. translocation of solutesB. nitrate reductionC. tryptophan synthesisD. ascorbic acid synthesis |
| Answer» Correct Answer - B | |
| 548. |
Which enzyme is activated by Molybdenum ? |
| Answer» Correct Answer - Nitrogenase | |
| 549. |
Plants which are deficient in zinc will show reduction in the biosynthesis ofA. EthyleneB. Coenzyme AC. FerredoxinD. Auxin |
| Answer» Correct Answer - D | |
| 550. |
Zinc as a nutrient is used by the plants in the form ofA. `Zn`B. `Zn^(2+)`C. `ZnO`D. `ZnSO_(4)` |
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Answer» Correct Answer - B Zinc is taken up by the plants in the form of `Zn^(2+)`. It is requird for bisynthesis of chlorophyll in some plants. Deficiency of Zn is shown by a reduction in internodal growth as a result plants display a rosetted habit of growth in which the leaevs form a circular cluster radiating at orr close to the ground. |
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