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 Multiple Choice QuestionsMultiple Choice Questions


Which of the following microbes produces nitrogen-fixing nodules in non-leguminous plants?

  • Rhizobium

  • Frankia

  • Azotobacter

  • Pseudomonas

  • Pseudomonas



Frankia is a genus of nitrogen  fixing, filamentousbactera that live in a symbiosis non- leguminous plants.


Read the following deficiency symptoms of micronutrients in plants.

I. Loosening of inflorescence in Cauliflower.

II. Apical necrosis of young leaves (reclamation disease).

III. Bronze colour in leaves

IV. Upper half a lamina falls down (whiptail disease)

V. Legume cotyledons with brownish spots (marsh spot disease)

Pick out the symptoms caused by the deficiency of molybdenium and choose the correct option.

  • II, IV and V

  • I, III and IV

  • III and II

  • I and IV


I and IV

Molybdenum is a micronutrient found everywhere in plants more commonly in roots. Its major functions include nitrogen metabolism, ascorbic acid synthesis and oxidation reduction reaction. Its deficiency causes mottled chlorosis with marginal necrosis, whiptail diseases, etc.


Macromolecule chitin is

  • Nitrogen-containing polysaccharide

  • Phosphorous containing polysaccharide

  • Sulphur containing polysaccharide

  • Simple polysacchaaride


Nitrogen-containing polysaccharide

Macromolecules chitin is an example of complex structural hetero plysaccharide. It has nitrogen-containing glucose derivatives such as N-acetyl glucosamine.


Which of the following is not a role played by potassium in plant growth?

  • Translocation of carbohydrates

  • Maintaining anion-cation balance

  • Opening and closing of stomata

  • Synthesis of protein

  • Synthesis of protein


Translocation of carbohydrates

Boron is responsible for carbohydrate transport.


The first stable product of fixation of atmospheric nitrogen in the leguminous plant is 

  • NO2-

  • ammonia

  • NO3-

  • glutamate



N2Nitrogen  N2H2 Dimide N2H4Hydrazine  2NH3Ammonia

The fixation of atmospheric nitrogen to ammonia is given as

N2 + 8e- + 8H+ + 16ATP NitrogenaseMO -Fe                            2NH3 + H2 + 16 ADP + 16Pi

The process in which atmospheric nitrogen rates concerted into inorganic nitrogenous (nitrate, ammonia) compounds through microorganisms is called biological nitrogen fixing.


Which of the following is correctly matched for the deficiency symptom produced by them?

  • Molybdenum - Disturbance in iron metabolism

  • Sodium - Interfere with healthy growth of nails and hair

  • Protein - Convulsions and hallucinations

  • Riboflavin - Beri beri


Molybdenum - Disturbance in iron metabolism

Molybdenum is the part of several enzymes essential for the synthesis of haemoglobin and absorption of iron. Its deficiency leads to disturbance in iron metabolism, which affects growth of the body.


N2 + 8e + 8H+ + 16ATP  2NH3 + H2 + 16ADP + 16 Pi
The above equation refers to

  • Nitrification

  • Reductive amination

  • Denitriofication

  • Transamination

  • Transamination


Nitrogen fixation

Nitrogen fixation is a process in which nitrogen (N2) in the Earth's atmosphere is converted to ammonia.


Following are the two statements regarding the origin of life.

  1. The earliest organisms that appeared on the earth were non-green and presumably an aerobes.
  2. The first autotrophic organisms were the chemoautotrophs that never released oxygen of the above statements which on of the following options is correct?


  • II is correct, but I is false

  • Both I and II are correct

  • Both I and II are false

  • I is correct, but II is false


Both I and II are correct

The earliest organisms that appeared on earth were anaerobic chemoautotrophs. Chemoautotrophs were the first autotrophic organisms. They were unable to perform photolysis of water and never released oxygen, e.g. sulphur bacteria