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Mineral Nutrition · Question 32

AIPMT 2010 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

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.

Answer

(4) Nitrogenase is insensitive to oxygen.

Solution

As per NCERT, the enzyme nitrogenase is highly sensitive to molecular oxygen; it needs anaerobic conditions. The nodules (the sites of N2 fixation) contain the pink pigment leghaemoglobin, which acts as an oxygen scavenger and protects nitrogenase.

Nitrogenase catalyses N2 NH3.

Statement (4) is not correct.

Answer: (4)

Out of syllabusAIPMT 2010 (Mains)

Keep practising — Mineral Nutrition

2

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)
3

One of the free-living, anaerobic nitrogen-fixer is

  1. Beijerinckia
  2. Rhodospirillum
  3. Rhizobium
  4. Azotobacter
AIPMT 2010 (Prelims)
4

An element playing important role in nitrogen fixation is

  1. molybdenum
  2. copper
  3. manganese
  4. zinc
Out of syllabusAIPMT 2010 (Prelims)
5

Which one of the following is not a micronutrient?

  1. Molybdenum
  2. Magnesium
  3. Zinc
  4. Boron
Out of syllabusAIPMT 2010 (Prelims)
6

Manganese is required in

  1. plant cell wall formation
  2. photolysis of water during photosynthesis
  3. chlorophyll synthesis
  4. nucleic acid synthesis
Out of syllabusAIPMT 2009
7

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

  1. Bradyrhizobium
  2. Frankia
  3. Clostridium
  4. Azorhizobium
AIPMT 2008
8

Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing micro-organism?

  1. Crotalaria juncea
  2. Cycas revoluta
  3. Cicer arietinum
  4. Casuarina equisetifolia
AIPMT 2007
9

Which one of the following elements is not an essential micronutrient for plant growth?

  1. Zn
  2. Cu
  3. Ca
  4. Mn
Out of syllabusAIPMT 2007
10

A plant requires magnesium for

  1. protein synthesis
  2. chlorophyll synthesis
  3. cell wall development
  4. holding cells together
Out of syllabusAIPMT 2007
11

Sulphur is an important nutrient for optimum growth and productivity in

  1. oilseed crops
  2. pulse crops
  3. cereals
  4. fibre crops.
Out of syllabusAIPMT 2006

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