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Nitrogen Nutrition - Basic

Dear Readers,

Nitrogen is a component of vitamins, amino acids and energy systems within the plant, which form its proteins. Thus, N is directly responsible for increasing protein content in plants.

Q1.  The leghaemoglobin which imparts pink red colour to the root nodules is located in

  •   The wall of bacteria
  •  The wall of host cell
  •  In the cytoplasm of host cell
  •   In between bacteroids and the surrounding membrane of host origin

In between bacteroids and the surrounding membrane of host origin

Q2.  Besides providing pink colour to the root nodules, leghaemoglobin performs the function of

  •  Protecting enzyme nitrogenase from free oxygen
  •  Transporting nitrogen to host cells
  •  Protecting bacteroids from the enzymes of host cell
  •  Protecting leakage of fixed nitrogen to the soil atmosphere

Protecting enzyme nitrogenase from free oxygen

Q3.  The limiting factor in nitrification of soil is

  •   Soil nature (pH)
  •  Temperature
  •  Light
  •   Air

Soil nature (pH)

Q4. In root nodules of leguminous plants, the Rhizobium bacteroids are filled in

  •   Diploid cells
  •   Triploid cells
  •  Tetraploid cells
  •  Hexaploid cells

Tetraploid cells

Q5.  The carnivorous plants live in water logged or boggy habitats which are

  •  Deficient in nitrates
  •  Deficient in sulphites
  •  Deficient in oxygen
  •  Deficient in many salts

Deficient in nitrates

Q6.  A crop plant can grow well in nitrogen deficient soils without addition of manure is

  •  Cajanus cajan
  •   Gossypium herbaceum
  •  Helianthus annuus
  •  Allium sativum

Cajanus cajan

Q7.  Nitrosomonas and Nitrosococcus promote

  •   Anaerobic reduction of ammonia
  •   Anaerobic oxidation of ammonia
  •  Aerobic reduction of ammonia
  •  Aerobic oxidation of ammonia

Aerobic oxidation of ammonia

Q8.  The possibility of increase of infectious disease become more due to more supply of

  •  Potassium
  •   Magnesium
  •   Nitrogen
  •   Copper

Copper

Q9.  The element which is required in largest quantities by plants is

  •  Phosphorus
  •   Nitrogen
  •   Sulphur
  •  Calcium

Nitrogen

Q10.  On the basis of symptoms of chlorosis in leaves, a student inferred that this was due to the deficiency of nitrogen. This inference could be correct only if yellowing of leaves appeared first in

  •   Young leaves
  •   Old leaves
  •   Young leaves followed by old leaves
  •   Old leaves followed by young leaves

Old leaves



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