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Mineral Nutrition · Question 49

AIPMT 2001MCQEasy📈 Topic in 25% papers+4−1
1

Enzyme first used for nitrogen fixation

  1. nitrogenase
  2. nitroreductase
  3. transferase
  4. transaminase

Answer

(1) nitrogenase

Solution

As per NCERT, the reduction of nitrogen to ammonia by living organisms is called biological nitrogen fixation; the enzyme nitrogenase, present exclusively in prokaryotes, is capable of this reduction.

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

Transaminase is used later, to transfer the amino group from glutamic acid to keto acids.

∴ The enzyme first used for nitrogen fixation is nitrogenase.

Answer: (1)

AIPMT 2001

Keep practising — Mineral Nutrition

2

Passive absorption of minerals depends on

  1. temperature
  2. temperature and metabolic inhibitor
  3. metabolic inhibitor
  4. humidity
Out of syllabusAIPMT 2001
3

Roots of which plant contain a red pigment which has affinity for oxygen?

  1. Carrot
  2. Soybean
  3. Mustard
  4. Radish
Out of syllabusAIPMT 2001
4

Mg is a component of

  1. chlorophyll
  2. cytochrome
  3. haemoglobin
  4. haemocyanin
Out of syllabusAIPMT 2000
5

Plants take zinc in the form of

  1. ZnSO4
  2. Zn2+
  3. ZnO
  4. Zn
Out of syllabusAIPMT 2000
6

When the plants are grown in magnesium deficient but urea rich soil, the symptoms expressed are

  1. yellowish leaves
  2. colourless petiole
  3. dark green leaves
  4. shoot apex dies
Out of syllabusAIPMT 2000

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