MCQ Mineral Nutrition# 6





 Multiple  Choice Questions:

1. Photosynthetic nutrition in plants is also known as 

(1) Holophytic nutrition 
(2) Chemotrophic nutrition 
(3) Heterotrophic  nutrition 
(4) Heteroholophytic nutrition 

Answers  (1) 

2.  An  essential  element  is that which 

(1) is found in plant ash 
(2) is available  in soil
(3) improve  health 0f plant  
(4) is irreplaceable and indispensable  for growth of plants 

Answers (4) 

3. Plants require major elements  in small quantities  their major  role is to act as 

(1) Requlation of cell division of meristematic  sites

(2) co_ factors of enzymes

(3) building  blocks of important  amino acids 

(4) precursors  of plant hormones 

Answers (2) 

4. Micronutrients  are 

(1) less important  than macronutrients  

(2) as important  as macronutrients 

(3) Having no role in plant nutrition 

(4) omitted from culture medium without any detrimental effects 

Answers (2) 

5. Importance of microelements was recognised late due to 

(1) their toxicity 

(2) presence  as   contaminants in macronutrients 

(3) negligible  role played by them in plant physiology  

(4) leakage from roots.

Answers (2) 

 6. An essential  element  derived from soil only is called 
(1) micronutrient     (2) macronutrient

(3) mineral elements  (4) macroelement 

Answers (3) 

 7.  The criteria for the essentiality of a mineral element were given by 

(1) Arnon  and Stout    (2)  Hoagland 

(3) Hopkins                  (4) Sachs  and  Liebig 

Answers (1) 


8.  Carl Maze  (1915) divided mineral elements into two categories  on the basis of 

(1) Quantity  in which these are required  

(2) Quality and action 

(3)  toxicity  they cause 

(4)  path they  travelled  in plant 

Answers (1) 

 9.  Choose the correct one 

(1)  C, H, O are called  frame work elements 

(2) Ca²+, Mg²+, K+ are  protoplasmic  elements 

(3) C, H, O, N are balancing  elements  

(4) All of the above 

Answers (1)


10. Essential  micronutrients are also known as 

(1)  Tracer  elements   (2) Trace elements 

(3)  Radioisotopes 

(4) Frame work elements 

Answers(2) 

 11.  Zinc is a 

(1) Tracer  element  (2) Trace element

(3) Macronutrient   

(4) nonmineral  nutrient 

Answers (2) 

12. Microelements are those essential which are required by the plants in concentration 

(1) Less than 10m mole/ kg of dry matter

(2) Less than 1m mole/ kg of dry matter 

(3) More than 1 ųg/ g of dry matter. 

(4) equal to than 20 ųg/ g of dry matter 


Answers (1)

13. The concentration  of a macroelement per gm of dry matter in plants is at least 

(1) 1000 ųg/ gm of dry matter 

(2) 100 ųg / gm of dry matter 

(3) 1500 ųg / gm of dry matter

(4) 995  ųg / gm of dry matter


Answers (1) 
 
 14. What   is an essential  element?

(1) An element present  in the soil 

(2) An element present in the plant.

(3) An  element that improves growth of plant.

(4) An element without which a plant will not grow and complete its life cycle. 

Answers (4) 

 15. The  ion which is commonly  found free in the cell is 

(1) potassium          (2)  borate 

(3) sulphur             (4) Nitrogen 

Answers (1) 

 16. The major portion of the dry weight of plant comprised of 

(1) N, P, K             (2) Ca,  Mg ,  S

(3)  C, N, H          (4)  C, H, O 

Answers (4)

17. It is possible  to  determine  whether  an element is essential  by observing  growth of plants 

(1) in soil  form which the particular element  is removed 

(2)  in soil in which only the particular  element  is present 

(3) in an inert medium to which solution  of only the particular  element  is added. 

(4) in an inert medium to which  a nutrient solution  excluding  that particular  element  is added 

Answers (4) 


18. Most  abundant  elements  in the living  cells are 

(1) C, O, N and P     (2) C, H, O and Ca 

(3) C, H, O and N    (4) C,H, Mg and N 

Answers (3)

19. Which one is an essential  mineral, not constituent  of any enzyme  but stimulates  the activity  of many enzymes?

(1) Na          (2) B        (3) K       (4) C 

Answers (3)

20. A trace element, also required for plant growth,  and in the form of radio active isotope useful in cancer therapy  is 

(1) Iron                       (2) Calcium  

(3) Cobalt                   (4) sodium 

Answers (3) 

21. Choose the correct statement .

(1) Solution culture (hydroponics) contains all essential  elements  except  one, the usefulness  of which is to be determined .

(2) In Aeroponics  roots are dipped in solution culture rich in air 

(3) Potometer is used to measure degree of opening  of stomata 

(4) All of the above 

Answers (1)

22.  The agent that keeps metals in the soluble  state is called 

(1) Chelating agent     (2) balancing agent 

(3) Buffer agent          (4) Catalytic agent.

Answers (1)

 23.  The most crucial event in nature governing nutrient balance   is 

(1) Primary  production 

(2) Secondary  production  

(3) Nutrient cycling  

(4) Gross production 

Answers (3)

24. Which has both Fe and Cu as prosthetic group?

(1) Harmoglobin       (2) Dehydrogenase 

(3) Polymerase           (4) Cytochrome oxidase

 Answers (4)

25. Which of the following  is a component of co_ enzyme A, vitamin  biotin, thiamine and mustard oil and whose deficiency  results in  decrease in nodule formation  is 

(1) Cu     (2) Ca       (3) S     (4)  Mn 

Answers (3)

26. The  deficiency  of boron  results in all except 

(1) Top sickness  

(2) Browning  of hand in cauliflower  

(3) Internal cork 

(4) Marsh spot disease 

Answers (4) 

27. In green plants, Boron assists 

(1) in activation  of enzymes

(2) In nitrogen fixation  

(3) in photosynthesis 

(4)  in sugar transport 

Answers (4)

28. Match the correct deficiency  symptoms 

(1) Cu_ exanthema 

(2) Mg__ interveinal chlorosis  and upward curling  of leaves 

(3) Zu__ malformation  of leaves and fruits 

(4) All of the above 


Answers (4) 

29. Which of the following  is non_ symbiotic? 

(1) Azotobacter      (2) Nostoc 

(3) Rhizobium       (4) Frankia 

Answers (1) 

30. The most important  function of Rhizobium  is 

(1) Nitrogen  assimilation  

(2) Nitrogen fixation  

(3) Ammonofication  

(4) Nitrification  

Answers (2)

31. Which  of  the following  gene clusters in bacteria  is responsible  for nitrogen fixation?

(1)  nod, nif, fix      (2) nod,  ndf,   nfx 

(3) nod, nix, nfx    (4) ndx,  nif, fix 

Answers (1)

32. N2 fixation is 

(1) N2 ➡️ NH3             (2) NO3➡️  NO2
(3) N2➡️ Amino acid   (4) Both (1) and (2) 

Answers (1)

33. The process of N2 fixation in root nodules is controlled by 

(1) nif                              (2) NAA

(3) IAA                             (4) ABA 

Answers (1) 

34. Enzyme  involved  in nitrogen assimilation  

(1) Nitrogenase       (2) nitrate reductase 

(3) transferase        (4) transaminase 

Answers (2) 

35. Nitrate reductase forms 

(1) N2    (2) NH3    (3)  NO2      (4) NO4 

Answers (3)

36. If by radiation all nitrogenase enzymes are inactivated  then  there will be no 

(1) fixation of atmospheric  nitrogen 

(2) conversion from nitrate to nitrite in legumes 

(3) conversion  from ammonium  to nitrate in soil 

(4) Fixation of nitrogen in legumes  

Answers (4) 

37. Plants that have mutualistic relations with nitrogen _ fixating bacteria  receive from the bacteria 

(1) Ammonium     (2) Amino acids 

(3) Nitrate              (4) Nitrite 

Answers (1)

38. Plants that have mutualistic relations with nitrogen _ fixing  bacteria provide the bacteria  with 

(1) N2                       (2) Enzymes 

(3) Sugars               (4) Nitrite 

Answers (3)

39. Nitrosomonas and Nitrosococcus promote 

(1) reduction of ammonia  

(2) Oxidation of nitrite 

(3) Reduction  of nitrate 

(4) Oxidation  of ammonia  

Answers (4)

40.  The Nitrobacter  and Nitrococcus  

(1) oxidation nitrite  to nitrate 

(2) oxidise  Nitrate 

(3) Reduce nitrite 

(4) Reduce nitrate 

Answers(1)

41.  Reduction is the term used when conversion of ...... takes place 

(1) nitrate to nitrite 

(2) nitrite to nitrate 

(3) ammonia  to nitrogen  

(4) all of the above 

Answers (1)

42.  Certain bacteria  living  in the soil poor in oxygen  convert nitrates into nitrite and then to free nitrogen and such bacteria  are termed as 

(1)  Nitrogen  fixing bacteria 

(2) denitrifying  bacteria 

(3) ammonifying  bacteria  

(4) saprophytic bacteria  

Answers (2)

43. Bact which break down the dead  organisms of the soil into nitrogen compounds are termed  

(1) Denitrifying  bacteria 

(2) nitrifying and ammonifying  bacteria 

(3) Nitrogen fixing bacteria 

(4) parasitic  bacteria 

Answers (2) 

44. The nodules in a plant root where nitroge fixing bacteria  live forms from cells of the 

(1) Epidermis        (2) Cortex 

(3) Endodermis     (4) Vascular  tissue 

Answers (2)

45.  The source of energy  for non_ biological  nitrogen fixation  is 

(1) by ionizing  events such as lightning  and effect of  cosmic  rays 

(2) Ferredoxin  enzyme and nitrogenase  

(3) By reduction of proteins  to ammonia  

(4) By oxidation  of ammonia  to protein

Answers (1)

46. Vicia faba and Pisum sativum are recommended  for rotation  of crops because  they 

(1) Require small amount of water 

(2) are cash crops 

(3) help  in nitrogen fixation of  soil 

(4) Kill all the harmful  insects 

Answers (3)

47. Nitrogen fixing  enzyme  in root nodule is 
(1) nitrase                (2) Nitrogenase  

(3)  Nitrosomonas  (4) nitrogen esterase

Answers (2)

48. Which of the following  is an incorrect match?

(1) Free living nitrogen  fixing  bacteria  _ Azotobacter 

(2) Symbiotic nitrogen   fixing cyanobacteria_ Anabaena .

(3) Symbiotic  nitrogen fixing  cyanobacteria _ Frankia .

(4) Symbiotic  nitrogen fixing cyanobacteria_ Xanthomonas 


Answers (3)


49. Which of  the following  can use elemental nitrogen  as their nitrogen  source 

(1) Anabaena         (2) Nitrobacter 

(3) Nitrosomonas     (4) All of these 

Answers (1)

50. Nitrogen fixation  by organisms  requires conditions  that are 

(1) highly alkaline 

(2) anaerobic  

(3) Saturated  with sunlight 

(4) Free of  water 

Answers  (2)









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