NEET Biology Mineral Nutrition In Plants Question Bank

done Self Evaluation Test - Mineral Nutrition Total Questions - 75

• question_answer1)
  Sulphur is component of:
  A)
  Protein              done clear
  B)
  DNA done clear
  C)
  RNA                              done clear
  D)
  Both [b] and [c] done clear
  View Solution play_arrow

• question_answer2)
  Which of the following element is very essential for uptake and utilisation of \[C{{a}^{2+}}\] and membrane function?                   
  A)
  Phosphorus        done clear
  B)
  Molybdenum done clear
  C)
  Manganese      done clear
  D)
         Boron done clear
  View Solution play_arrow

• question_answer3)
  Various fungi are known to accumulate considerable quantities of divalent metals. It includes:
  A)
  Cd                                done clear
  B)
         Zn done clear
  C)
         Pb                                done clear
  D)
         All of these done clear
  View Solution play_arrow

• question_answer4)
  Chlorosis is produced in leaves due to deficiency of Fe, Mg, Mn, N or S. Of these essential elements, those that are exclusive constituents of the chlorophyll molecule are:
  A)
  Fe and S done clear
  B)
                     N and S done clear
  C)
         Mg and S           done clear
  D)
         Mg and N done clear
  View Solution play_arrow

• question_answer5)
  If the size of fruits diminishes in plants, which mineral ion should be added to soil?
  A)
  Copper              done clear
  B)
         Calcium done clear
  C)
         Boron                            done clear
  D)
         Chlorine done clear
  View Solution play_arrow

• question_answer6)
  Which of the following contains copper?
  A)
  Quinone            done clear
  B)
         Plastoquinone done clear
  C)
         Plastocyanin     done clear
  D)
         None of these done clear
  View Solution play_arrow

• question_answer7)
  All of the following statements concerning the Actinomycetous filamentous soil bacterium Frankia are correct except, the Frankia
  A)
  Can induce root nodules on many plant species. done clear
  B)
         Cannot fix nitrogen in the free-living state. done clear
  C)
         Like Rhizobium, it usually infects, its host plant through root hair deformation and stimulates cell proliferation in the host's cortex. done clear
  D)
         Forms specialised vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids. done clear
  View Solution play_arrow

• question_answer8)
  The mode of catching insects in Drosera plants is by means of:
  A)
  Sensitive glandular hairs which secrete a sweet, viscous, shining substance. done clear
  B)
         Specially sensitive trigger hairs. done clear
  C)
         Leaves which are modified into pitcher. done clear
  D)
         Leaf segments modified into bladder. done clear
  View Solution play_arrow

• question_answer9)
  The component of nitrogenase and nitrate reductase is:
  A)
  N                      done clear
  B)
         Mo done clear
  C)
         Co                    done clear
  D)
         No specific component done clear
  View Solution play_arrow

• question_answer10)
  In the choices below, which is not a correct pairing of a macronutrient and the major functions it performs in the life of a plant?
  A)
  Potassium in enzyme activation, water balance, ion balance. done clear
  B)
         Calcium in activity of embranes and cytoskeleton, secondary messenger. done clear
  C)
         Sulphur in proteins and coenzymes. done clear
  D)
         Iron in active sites of many redox enzymes and electron carriers. done clear
  View Solution play_arrow

• question_answer11)
  "Mottled chlorosis" on the leaves occurs due to the deficiency of:
  A)
  Nitrogen             done clear
  B)
         Potassium done clear
  C)
         Sulphur                         done clear
  D)
         Phosphorus done clear
  View Solution play_arrow

• question_answer12)
  An essential element which:
  A)
  Is found in plant ash. done clear
  B)
         Is available in the soil. done clear
  C)
         Improves health of the plant. done clear
  D)
         Is irreplaceable and indispensable for growth of plants. done clear
  View Solution play_arrow

• question_answer13)
  Which of the following is essential mineral element and is not a constituent of any enzyme but stimulate the activity of many enzymes?
  A)
  Zn                                 done clear
  B)
         Mg done clear
  C)
         Mn                                done clear
  D)
         K done clear
  View Solution play_arrow

• question_answer14)
  Molybdenum causes:
  A)
  Mottling             done clear
  B)
         Reclamation done clear
  C)
         Wilting                           done clear
  D)
         Chlorosis done clear
  View Solution play_arrow

• question_answer15)
  Ratio of C:O in plant materials is:
  A)
  45:45                done clear
  B)
         10:20 done clear
  C)
         25:50                            done clear
  D)
         50:25 done clear
  View Solution play_arrow

• question_answer16)
  Which one of the following is not an essential element for plants?
  A)
  Potassium                      done clear
  B)
         Iron done clear
  C)
         Iodine                            done clear
  D)
         Zinc done clear
  View Solution play_arrow

• question_answer17)
  Which of the following is/are not an essential micronutrient?
  A)
  Boron done clear
  B)
         Nickel and cadmium done clear
  C)
         Molybdenum done clear
  D)
         Zinc done clear
  View Solution play_arrow

• question_answer18)
  Appearance of brown spots surrounded by chlorotic veins is a prominent toxicity symptom of:
  A)
  Mn                                done clear
  B)
         Mo done clear
  C)
         Mg                                done clear
  D)
         Zn done clear
  View Solution play_arrow

• question_answer19)
  Which of the following is a flowering plant with nodules containing filamentous nitrogen- fixing microorganism?
  A)
  Cicer arietinum done clear
  B)
         Casuarina equisetifolia done clear
  C)
         Crotalaria juncea done clear
  D)
         Cycas revolute done clear
  View Solution play_arrow

• question_answer20)
  Which of the following pigment is essential for nitrogen fixation by leguminous plants?
  A)
  Anthocyanin                  done clear
  B)
         Phycocyanin done clear
  C)
         Phycoerythrin    done clear
  D)
         Leghaemoglobin done clear
  View Solution play_arrow

• question_answer21)
  Which one of these do, plants require for the formation of ATP?
  A)
  N and Ca           done clear
  B)
         N and P done clear
  C)
         N and Cu           done clear
  D)
         K done clear
  View Solution play_arrow

• question_answer22)
  Which element is required comparatively, I least quantity for the growth of plant?
  A)
  Zn                                 done clear
  B)
         N done clear
  C)
         P                                  done clear
  D)
         Ca done clear
  View Solution play_arrow

• question_answer23)
  Which element is not considered as macronutrient?
  A)
  Mg                                done clear
  B)
         Ca done clear
  C)
         Mn                                done clear
  D)
         P done clear
  View Solution play_arrow

• question_answer24)
  Which one of the following is an amide involved in nitrogen assimilation by plants?
  A)
  Glutamate                     done clear
  B)
         Alanine done clear
  C)
         Asparagine         done clear
  D)
         Serine done clear
  View Solution play_arrow

• question_answer25)
  The most abundant element present in the plants is:
  A)
  Iron                               done clear
  B)
         Carbon done clear
  C)
         Nitrogen             done clear
  D)
         Manganese done clear
  View Solution play_arrow

• question_answer26)
  Which of the following does NPK denote?
  A)
  Nitrogen, Potassium, Kinetin done clear
  B)
         Nitrogen, Protein, Kinetin done clear
  C)
         Nitrogen, Protein, Potassium done clear
  D)
         Nitrogen, Phosphorus, Potassium done clear
  View Solution play_arrow

• question_answer27)
  Insectivorous plants live in a soil that is usually deficient in:
  A)
  Nitrate               done clear
  B)
         Chloride done clear
  C)
         Potassium          done clear
  D)
         Magnesium done clear
  View Solution play_arrow

• question_answer28)
  Where does most nutrient uptake occur in roots?
  A)
  At the root tip, where root tissue first encounters soil away from the zone of nutrient depletion. done clear
  B)
         At the casparian strip, where ions must enter the symplast prior to entering xylem cells. done clear
  C)
         In the symplastic and apoplastic pathways. done clear
  D)
         In root hairs and in the zone of maturation. done clear
  View Solution play_arrow

• question_answer29)
  Gray spots of Oat are caused by deficiency of:
  A)
  Cu                                done clear
  B)
         Zn done clear
  C)
         Mn                                done clear
  D)
         Fe done clear
  View Solution play_arrow

• question_answer30)
  Deficiency of iron causes:
  A)
  Interveinal chlorosis first on young leaves. done clear
  B)
         Decrease in protein synthesis. done clear
  C)
         Reduced leaves and stunted growth. done clear
  D)
         Bending of stem tip. done clear
  View Solution play_arrow

• question_answer31)
  Which of the following will not make minerals more available to plants?     
  A)
  Increasing the rainfall in a wet forested area. done clear
  B)
         Raising the pH of a very acidic soil. done clear
  C)
         Tillering a packed-down or water-logged soil. done clear
  D)
         Introducing fungi that can form mycorrhiza into a soil that lacks them. done clear
  View Solution play_arrow

• question_answer32)
  Phosphorous and nitrogen ions generally get depleted in soil because they usually occur as:
  A)
  Neutral ions done clear
  B)
         Negatively charged ions done clear
  C)
         Positively charged ions done clear
  D)
                     Both positively and negatively charged but in disproportionate mixture. done clear
  View Solution play_arrow

• question_answer33)
  The following reaction points out the process of \[\alpha \]-ketoglutaric acid \[+N{{H}_{4}}{{^{+}}_{{}}}NADPH\] \[\xrightarrow[dehydrogenase]{Glutamate}Glutamate+{{H}_{2}}O+NADP\]
  A)
  Nitrification done clear
  B)
         Transamination done clear
  C)
         Amination done clear
  D)
         Reductive amination done clear
  View Solution play_arrow

• question_answer34)
  Function of leghaemoglobin (a red pigment) in root nodules of leguminous plants is to regulate:
  A)
  \[{{O}_{2}}\]supply in cells done clear
  B)
         \[C{{O}_{2}}\] supply in cells done clear
  C)
         Production of phenolic compounds done clear
  D)
         Mo supply in cells done clear
  View Solution play_arrow

• question_answer35)
  Essential macro elements are:
  A)
  Absorbed from soil. done clear
  B)
         Manufactured during photosynthesis. done clear
  C)
         Produced by enzymes. done clear
  D)
         Produced by growth hormones. done clear
  View Solution play_arrow

• question_answer36)
  Generally, plants absorb \[{{N}_{2}}\] in the form of:
  A)
  \[N{{O}_{2}}^{-}\]                              done clear
  B)
         \[N{{O}_{3}}^{-}\] done clear
  C)
         \[N\equiv N\]                  done clear
  D)
         \[HN{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer37)
  Which of the following characteristics defines an element as essential for a particular species?
  A)
  It has to be added as fertiliser to achieve maximum seed production. done clear
  B)
         If it is missing, a plant cannot grow or reproduce normally. done clear
  C)
         If it is present in high concentration, plant growth increases. done clear
  D)
         If it is absent, other nutrients may be substituted for it. done clear
  View Solution play_arrow

• question_answer38)
  Hydroponics is a technique in which plants are grown in:
  A)
  Green house done clear
  B)
         Water saturated sand done clear
  C)
         Balanced nutrient solution done clear
  D)
         Purified distilled water done clear
  View Solution play_arrow

• question_answer39)
  The plant ash is an indication of:
  A)
  Mineral salts absorbed by the plant done clear
  B)
         Organic matter of the plant done clear
  C)
         Both the mineral salts and organic matter done clear
  D)
         None of the above done clear
  View Solution play_arrow

• question_answer40)
  Which element is related with Khaira disease of paddy & auxin synthesis?
  A)
  Fe                     done clear
  B)
         Zn done clear
  C)
         B                                  done clear
  D)
         Cu done clear
  View Solution play_arrow

• question_answer41)
  Plants absorb mineral salts from the soil solution through:            
  A)
  A semipermeable membrane into the cytoplasm. done clear
  B)
         Perforations at the apex of root hair cells. done clear
  C)
         The cell wall which is semipermeable. done clear
  D)
         None of the above done clear
  View Solution play_arrow

• question_answer42)
  Active uptake of minerals depends upon:
  A)
  Active water absorption done clear
  B)
         Transpiration done clear
  C)
         Photorespiration done clear
  D)
         Dephosphorylation done clear
  View Solution play_arrow

• question_answer43)
  The diagram shows the development of root nodule in soyabean.
  A)
  1-Rhizobium bacteria; 2-Cortex cell; 3-Outer cortex; 4-Infection thread done clear
  B)
         1-Rhizobium bacteria; 2-Cortex cell; 3-Inner cortex and pericycle cells; 4-Infection thread done clear
  C)
         1-Rhizobium bacteria; 2-Endodermal cell; 3-Inner endodermis; 4-Infection thread done clear
  D)
         1-Nitrosomonas bacteria; 2-Cortex cell; 3-Inner cortex and pericyle cells; 4-Infection thread done clear
  View Solution play_arrow

• question_answer44)
  Refer the figure given below and select the option which gives correct words for A, B, C And D.
  A)

  	A	B	C	D
  (a)	K	Ammonification	Animal biomass	Plant biomass

  done clear
  B)
        

  (b)

  \[N{{H}_{3}}\]

  Ammonification

  Plant biomass

  Animal biomass

  done clear
  C)
        

  (c)

  \[C{{O}_{2}}\]

  Denitrification

  Animal biomass

  Plant biomass

  done clear
  D)
        

  (d)

  CHO

  Nitrification

  Plant biomass

  Animal biomass

  done clear
  View Solution play_arrow

• question_answer45)
  Which of the following is a free living aerobic non-photosynthetic nitrogen-fixer?
  A)
  Rhizobium          done clear
  B)
                     Azotobacter done clear
  C)
         Azospirillum       done clear
  D)
         Nostoc done clear
  View Solution play_arrow

• question_answer46)
  Which of the following statements are incorrect in accordance with hydroponics?

  (i) It determines the mineral nutrients essential for plants.

  (ii) The hydroponics involves the culture of plants in a soil with defined mineral solution.

  (iii) Hydroponics requires purified water with non-defined mineral nutrient salts.

  (iv) In the hydroponics technique, plants are grown in sandy soil with nutrient solution.

  (v) By this method, essential elements required for the growth of plants can be identified and their deficiency symptoms can also be discovered.

  A)
  Only (iv)                        done clear
  B)
         Only (v) done clear
  C)
         Only (iii)                        done clear
  D)
         None of the above done clear
  View Solution play_arrow

• question_answer47)
  Nif genes occur in:
  A)
  Rhizobium                      done clear
  B)
         Aspergillus done clear
  C)
         Penicillium         done clear
  D)
         Streptococcus done clear
  View Solution play_arrow

• question_answer48)
  Match the following and choose the correct combination from the options given.

  	Column-I		Column-II
  A.	Sulphur	I.	Chlorophyll
  B.	Zinc	II.	Nitrogenase
  C.	Magnesium	III.	Methionine
  D.	Molybdenum	IV.	Auxin

  A)
  A-I;       B-II;      C-III;    D-IV done clear
  B)
         A-III;     B-IV;    C-I;      D-II done clear
  C)
         A-III;     B-I;       C-II;     D-IV done clear
  D)
         A-II;      B-IV;    C-I;      D-III done clear
  View Solution play_arrow

• question_answer49)
  Match the following and choose the correct combination from the options given.

  	Column-I		Column-II
  A.	Photolysis of water	I.	Zinc
  B.	Diazotrophy	II.	Copper
  C.	Cytochrome ?c? oxidase	III.	Manganese
  D.	Biosynthesis of IAA	IV.	Molybdenum
  E.		V.	Boron_

  A)
  A-III,     B-IV,    C-II,    D-I done clear
  B)
         A-V,     B-II,      C-III,   D-IV done clear
  C)
         A-III,     B-II,      C-I,     D-IV done clear
  D)
         A-IV,    B-I,       C-III,   D-II done clear
  View Solution play_arrow

• question_answer50)
  Which of the following gene clusters in bacteria is responsible for nitrogen fixation?
  A)
  nod, nif, fix                    done clear
  B)
         nod, nif, nfx done clear
  C)
         nod, nix, nfx                  done clear
  D)
         ndx, nif, fix done clear
  View Solution play_arrow

• question_answer51)
  Mycorrhiza is a symbiotic relationship between roots of higher plants and:
  A)
  Virus                 done clear
  B)
         Fungi done clear
  C)
         Bacteria                         done clear
  D)
         Blue green algae done clear
  View Solution play_arrow

• question_answer52)
  Choose a correct statement in accordance with essential mineral elements of plants.
  A)
  Minerals present in the soil cannot enter plants. done clear
  B)
         Gold is the only element which cannot be accumulated by plants. done clear
  C)
         Plants growing near nuclear test sites take up radioactive strontium. done clear
  D)
         Minerals present in very low concentration cannot be detected and hence, they remain undiscovered. done clear
  View Solution play_arrow

• question_answer53)
  Consider the functions given below and identify the concerned element.

  (i) Activator of catalase.

  (ii) Important constituent of cytochrome.

  (iii) Important constituent of proteins involved in ETS.

  (iv) Essential for chlorophyll synthesis.

  A)
  Mo                                            done clear
  B)
                     Fe done clear
  C)
                     Cu                                done clear
  D)
         Ca done clear
  View Solution play_arrow

• question_answer54)
  Match Column-I with Column - II and select the correct answer using the codes given below.

  	Column-I		Column-II
  A.	Potassium	I.	Constituent of ferredoxin
  B.	Sulphur	II.	Involved in stomatal movement
  C.	Molybdenum	III.	Needed in the synthesis of auxin
  D.	Zinc	IV.	Component of nitrogenase

  A)
  A-II;    B-I;     C-IV;    D-III done clear
  B)
         A-I;     B-II;    C-III;    D-IV done clear
  C)
         A-IV;   B-III;   C-II;     D-I done clear
  D)
         A-I;     B-III;   C-IV;   D-II done clear
  View Solution play_arrow

• question_answer55)
  The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in leguminous root nodule is:
  A)
  Nitrogenase       done clear
  B)
         Nitrite reductase done clear
  C)
         Nitrate reductase             done clear
  D)
         Hydrogenase done clear
  View Solution play_arrow

• question_answer56)
  Which of the following is a bacterium involved in denitrification?
  A)
  Nitrococcus                    done clear
  B)
         Azotobacter done clear
  C)
         Pseudomonas     done clear
  D)
         Nitrosomonas done clear
  View Solution play_arrow

• question_answer57)
  Which is the most abundant gas in our atmosphere that cannot be utilised by plants directly in its atmospheric form and is, therefore, captured by certain bacteria that live symbiotically in the nodules of roots?            
  A)
  Oxygen                         done clear
  B)
         Nitrogen done clear
  C)
         Neon                             done clear
  D)
         Hydrogen done clear
  View Solution play_arrow

• question_answer58)
  Enzyme nitrogenase contains element:
  A)
  Potassium                      done clear
  B)
         Zinc done clear
  C)
         Molybdenum      done clear
  D)
         Manganese done clear
  View Solution play_arrow

• question_answer59)
  Legume's roots have swellings called nodules that:    
  A)
  Produce antibiotics that protect the plant from soil bacteria. done clear
  B)
         Provide a steady supply of sugar to the host plant. done clear
  C)
         Increases the surface area for water uptake. done clear
  D)
         Contain nitrogen-fixing bacteria. done clear
  View Solution play_arrow

• question_answer60)
  The ability of the Venus Fly trap to capture insects is due to:
  A)
  Chemical stimulation by the prey. done clear
  B)
         A passive process requiring no special ability on the part of the plant. done clear
  C)
         Specialised "muscle-like" cells. done clear
  D)
         Rapid turgor pressure changes. done clear
  View Solution play_arrow

• question_answer61)
  Nitrogen gas is reduced to ammonia by:
  A)
  Rhizobium                      done clear
  B)
         Nitrogenase done clear
  C)
         Nitrification                    done clear
  D)
         Denitrification done clear
  View Solution play_arrow

• question_answer62)
  Azotobacter and Beijerinckia are the examples of:
  A)
  Symbiotic nitrogen-fixers done clear
  B)
         Non-symbiotic nitrogen-fixers done clear
  C)
         Ammonifying bacteria done clear
  D)
         Disease causing bacteria done clear
  View Solution play_arrow

• question_answer63)
  Non-biological nitrogen fixation is:
  A)
  Electrochemical and photochemical done clear
  B)
         Rhizobial done clear
  C)
         Cyanobacterial done clear
  D)
         None of the above done clear
  View Solution play_arrow

• question_answer64)
  Consider the statements and choose the correct options.

  (i) The deficiency of any element can cause multiple symptoms.

  (ii) Same symptoms may be caused by the deficiency of one or several different elements.

  (iii) The concentration of the essential element below which plant growth is retarded is termed as critical concentration.

  (iv) Chlorosis is the loss of chlorophyll due to deficiency of N, K, Mg, Fe, S, Mn, Zn, Mo.

  (v) Different plants respond differently to the deficiency of the same element.

  A)
  All are the above done clear
  B)
         (i) and (iv) done clear
  C)
         (i) and (iii)                      done clear
  D)
         (iii) and (iv) done clear
  View Solution play_arrow

• question_answer65)
  An element must be considered essential when:

  (i) The element is necessary for supporting normal growth and reproduction of the plants.

  (ii) The deficiency of that particular element cannot be met by supplying some other element.

  (iii) The element is directly involved in the metabolism of the plants.

  Choose the correct statements.

  A)
  (i) and (iii)                      done clear
  B)
         Only (ii) done clear
  C)
         (ii) and (iii)                     done clear
  D)
         (i),(ii) and (iii) done clear
  View Solution play_arrow

• question_answer66)
  Which of the following statement represent hydroponics?

  (i) Is useful in areas having thin; infertile and dry soils.

  (ii) Can regulate pH optimum for a particular crop.

  (iii) Increases labour cost.

  (iv) Increases problem of weeding.

  A)
  (i),(ii) and (iii)     done clear
  B)
         (i) and (ii) done clear
  C)
         (ii) and (iv)                     done clear
  D)
         (i) and (iii) . done clear
  View Solution play_arrow

• question_answer67)
  Match column-I with column-II and select the correct answer using the codes given below.

  	Column-I (Element)		Column-II (Function)		Column-III (Deficiency Symptom)
  A.	Calcium	I.	Required for ionic balance	(i)	Grey blot on leaves.
  B.	Boron	II.	Essential for constitution of nucleic acid	(ii)	Fruit yield decreases.
  C.	Phosphorus	III.	Required for absorption of calcium.	(iii)	Red blots on leaves.
  D.	Chlorine	IV.	Required to activate respiratory enzyme.	(iv)	Fruit-size diminishes.
  E.	Manganese	V.	Required for synthesis of bipolar spindle	(v)	Young root tip begin to die.

  A)
  A- I-iv;    B-II-v;    C - III-iii;  D - IV-i;   E -V-ii done clear
  B)
         A- V-v;   B-IV-iv;  C - iii-i;   D - II-iii;  E - I-ii done clear
  C)
         A- IV-iii;  B-I-iv;    C - V-v;   D - III-ii;  E - II-i done clear
  D)
         A- V-v;   B-III-iv;  C - ii-iii;  D - I-ii;    E - IV-i done clear
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• question_answer68)
  Which of the following statements are correct?

  (i) The deficiency of any element can cause multiple symptoms.

  (ii) Same symptoms may be caused by the deficiency of one or several different elements.

  (iii) The concentration of the essential element below which plant growth is retarded is termed as critical concentration.

  (iv) Chlorosis is the loss of chlorophyll due to deficiency of N, K, Mg, Fe, S, Mn, Zn Mo.

  (v) Different plants respond differently to the deficiency of the same element.

  A)
  (iii) and (iv)                    done clear
  B)
         (i) and (iv) done clear
  C)
         (i) and (iii)                      done clear
  D)
         All of the above done clear
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• question_answer69)
  Which of the following statement are incorrect?

  (i) The morphological changes are indicative of certain element deficiencies and are called deficiency symptoms.

  (ii) The part of plants that show the deficiency symptoms depend on the mobility of the element in the plant.

  (iii) Deficiency symptoms appear first in the young tissues whenever the element are relatively mobile.

  (iv) The deficiency symptoms of Cl, Zn, N, O, are visible first in the senescent leaves.

  A)
  (iii) and (iv)                    done clear
  B)
         (i) and (iii) done clear
  C)
         (i) and (iv)          done clear
  D)
         (ii) and (iv) done clear
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• question_answer70)
  Which of the following statements about nitrification is correct?
  A)
  Nitrobacter oxidises nitrate to nitrite. done clear
  B)
         Nitrosomonas and Nitrosococcus convert ammonium ions to nitrite. done clear
  C)
         Nitrification reactions are energy consuming reactions. done clear
  D)
         Heterotrophic plants are more directly dependent on the nitrifying bacteria for usable nitrogen than autotrophic plants. done clear
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• question_answer71)
  Match the items given in column-I with their examples given in column-II and choose the correct answer.

  	Column-I		Column-II
  A.	Free living aerobic nitrogen	I.	Anabaena and Nostoc
  B.	Anaerobic nitrogen fixers	II.	Pseudomonas and Thiobacillus
  C.	Nitrogen fixing cyanobacteria	III.	Nitrosomonas and Nitrococcus
  D.	Denitrifying bacteria	IV.	Azotobacter and Beijernickia
  E.	Nitrifying bacteria	V.	Rhodospirillum

  A)
  A-IV;   B-V;    C-I;    D -II;   E-III done clear
  B)
         A-V;    B-IV;   C-I;    D-III;   E-II done clear
  C)
         A-IV;    B-V;    C-II;   D-III;   E-I done clear
  D)
         A-IV;    B-III;   C-I;    D-II;    E-V done clear
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• question_answer72)
  Find the incorrectly matched pair.
  A)
  Rhizobium \[\to \] Alfalfa done clear
  B)
         Frankia \[\to \] Alnus done clear
  C)
         Rhodospirillum \[\to \] Aerobic done clear
  D)
         Bacillus \[\to \] Free ?living done clear
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• question_answer73)
  Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is incorrect during this process of nitrogen fixation?
  A)
  Leghaemoglobin scavanges oxygen and is pinkish in colour. done clear
  B)
         Nitrogenase is insensitive to oxygen. done clear
  C)
         Nodules act as sites for nitrogen fixation. done clear
  D)
         The enzyme nitrogenase catalyses the conversion of atmospheric \[{{N}_{2}}\] to\[N{{H}_{3}}\]. done clear
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• question_answer74)
  Which of the following statement(s) is/are correct?

  (i) Conversion of organic nitrogen to \[N{{H}_{4}}\]by soil microbes is called ammonification.

  (ii) Ammonia is first oxidised to nitrite by Nitrosomonas and Nitrosococcus.

  (iii) The nitrite is further oxidised to nitrate with the help of the bacterium Thiobacillus,

  (iv) In leaves, nitrate is reduced to form ammonia that finally forms the \[-N{{H}_{2}}\] group of amino acids.

  (v) Nitrosomonas, Nitrosococcus and Nitrobacter are chemoautotrophs.

  A)
  (i), (ii) and (iii)    done clear
  B)
         (ii), (iii), (iv) and (v) done clear
  C)
         (i), (ii) and (iv)    done clear
  D)
         (i), (ii), (iv) and (v) done clear
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• question_answer75)
  Plant obtains nitrogen from soil in the form of:
  A)
  Nitrite                done clear
  B)
         Nitrate done clear
  C)
         Ammonia                      done clear
  D)
         Hydroxylamine done clear
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