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Mineral Nutrition · Question 23

AIPMT 2012 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

For its action, nitrogenase requires

  1. high input of energy
  2. light
  3. Mn2+
  4. super oxygen radicals

Answer

(1) high input of energy

Solution

As per NCERT, the enzyme nitrogenase reduces molecular nitrogen to ammonia:

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

⇒ The reaction needs a very high input of energy (16 ATP for every N2 fixed).

∵ Nitrogenase is sensitive to oxygen, it works under anaerobic conditions; it does not need light, Mn2+ or oxygen radicals.

Answer: (1)

Out of syllabusAIPMT 2012 (Mains)

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2

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)
3

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)
4

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)
5

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

  1. Copper
  2. Manganese
  3. Boron
  4. Zinc
AIPMT 2011 (Mains)
6

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)
7

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

  1. Phosphorus
  2. Calcium
  3. Potassium
  4. Sulphur
Out of syllabusAIPMT 2011 (Prelims)
8

Nitrifying bacteria

  1. oxidize ammonia to nitrates
  2. convert free nitrogen to nitrogen compounds
  3. convert proteins into ammonia
  4. reduce nitrates to free nitrogen
Out of syllabusAIPMT 2011 (Prelims)
9

The function of leghaemoglobin in the root nodules of legumes is

  1. inhibition of nitrogenase activity
  2. oxygen removal
  3. nodule differentiation
  4. expression of nif gene
Out of syllabusAIPMT 2011 (Prelims)
10

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?

  1. Leghaemoglobin scavenges oxygen and is pinkish in colour.
  2. Nodules act as sites for nitrogen fixation.
  3. The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3.
  4. Nitrogenase is insensitive to oxygen.
Out of syllabusAIPMT 2010 (Mains)
11

Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D. [figure]

  1. array|l|l|l|l| A & B & C & D \ Nitrification & Ammonification & Animals & Plants \ array
  2. array|l|l|l|l| A & B & C & D \ Denitrification & Ammonification & Plants & Animals \ array
  3. array|l|l|l|l| A & B & C & D \ Nitrification & Denitrification & Animals & Plants \ array
  4. array|l|l|l|l| A & B & C & D \ Denitrification & Nitrification & Plants & Animals \ array
Out of syllabusAIPMT 2010 (Mains)

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