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 Multiple Choice QuestionsMultiple Choice Questions


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

  • NO2-

  • ammonia

  • NO3-

  • glutamate


Macromolecule chitin is

  • Nitrogen-containing polysaccharide

  • Phosphorous containing polysaccharide

  • Sulphur containing polysaccharide

  • Simple polysacchaaride


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


The structures present in the roots to absorb water and minerals is

  • Epidermal extensions

  • Hypodermis

  • Endodermis

  • Epidermal appendages


Nitrogen-fixation in root nodules of Alnus is brought about by

  • Bradyrhizobium

  • Clostridium

  • Frankia

  • Azorhizobium


Many elements are found in living organisms either free or in form of compounds. One of the following is negligible is living organisms

  • Silicon

  • Magnesium

  • Iron

  • Sodium


Which of the following is non-symbiotic nitrogen fixer organism?

  • VAM

  • Azotobacter

  • Anabaena

  • Rhizobium


Which of the following is responsible for biological nitrogen-fixation?

  • Nife gene

  • Nitrogenase

  • Yeast alanin tRNA synthetase

  • RNA synthetase


 ‘Sun basket’ is

  • The device to utilize sun rays directly to meet the requirement of heat energy

  • The sufficient amount of sunlight stored in a cell

  • A device of taking a sunbath

  •  All of the above


Chlorosis is produced in the leaves due to the deficiency of Fe, Mg, Mn, S or N of these essential elements, those that are exclusive constituents of chlorophyll molecule are

  • Fe, S

  • N,S

  • Mg, S

  • Mg, N