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Mineral Nutrition · Question 19

NEET 2013MCQEasy📈 Topic in 25% papers+4−1
1

The first stable product of fixation of atmospheric nitrogen in leguminous plants is

  1. NO3-
  2. glutamate
  3. NO2-
  4. ammonia.

Answer

(4) ammonia.

Solution

As per NCERT, the enzyme nitrogenase present in the root nodules of legumes catalyses the conversion of atmospheric nitrogen to ammonia, the first stable product of nitrogen fixation:

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

Ammonia is later converted into amino acids (e.g. glutamate).

Answer: (4)

Out of syllabusNEET 2013

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2

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere ?

  1. Anaerobic ammonium oxidation, and denitrification
  2. Aerobic nitrate oxidation, and nitrite reduction
  3. Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes
  4. Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds
NEET 2013 (Karnataka)
3

Which of the following elements is a constituent of biotin?

  1. Magnesium
  2. Calcium
  3. Phosphorus
  4. Sulphur
Out of syllabusNEET 2013 (Karnataka)
4

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere?

  1. Aerobic nitrate oxidation and nitrate reduction
  2. Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds
  3. Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes
  4. Anaerobic ammonium oxidation and denitrification
Out of syllabusNEET 2013 (Karnataka)
5

For its action, nitrogenase requires

  1. high input of energy
  2. light
  3. Mn2+
  4. super oxygen radicals
Out of syllabusAIPMT 2012 (Mains)
6

Which one of the following is wrong statement?

  1. Anabaena and Nostoc are capable of fixing nitrogen in free-living state also.
  2. Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
  3. Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.
  4. Nitrosomonas and Nitrobacter are chemo-autotrophs.
AIPMT 2012 (Prelims)
7

Best defined function of manganese in green plants is

  1. photolysis of water
  2. Calvin cycle
  3. nitrogen fixation
  4. water absorption
Out of syllabusAIPMT 2012 (Prelims)
8

Which one of the following is correctly matched?

  1. Passive transport of nutrients – ATP
  2. Apoplast – Plasmodesmata
  3. Potassium – Readily immobilisation
  4. Bakane of rice seedlings – F. Skoog
Out of syllabusAIPMT 2012 (Prelims)
9

Which one of the following is essential for photolysis of water?

  1. Copper
  2. Manganese
  3. Boron
  4. Zinc
AIPMT 2011 (Mains)
10

Which one of the following is not an essential mineral element for plants while the remaining three are?

  1. Iron
  2. Manganese
  3. Cadmium
  4. Phosphorus
Out of syllabusAIPMT 2011 (Mains)
11

Which one of the following elements in plants is not remobilised?

  1. Phosphorus
  2. Calcium
  3. Potassium
  4. Sulphur
Out of syllabusAIPMT 2011 (Prelims)

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