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Mineral Nutrition · Question 39

AIPMT 2007MCQMedium📈 Topic in 25% papers+4−1
1

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

Answer

(4) Casuarina equisetifolia

Solution

As per NCERT, Frankia, a filamentous (actinomycete) nitrogen-fixing micro-organism, produces nitrogen-fixing nodules on the roots of the non-leguminous flowering plant Alnus; similar actinorhizal nodules with Frankia are formed on the roots of Casuarina equisetifolia ⇒ (4).

∵ Crotalaria juncea and Cicer arietinum are legumes whose nodules contain the rod-shaped bacterium Rhizobium (not filamentous) ⇒ (1), (3) are wrong.

∵ Cycas revoluta is a gymnosperm (not a flowering plant) whose coralloid roots contain cyanobacteria ⇒ (2) is wrong.

Answer: (4)

AIPMT 2007

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2

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
3

A plant requires magnesium for

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

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
5

All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia

  1. can induce root nodules on many plant species
  2. can fix nitrogen in the free-living state
  3. forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids
  4. like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex.
AIPMT 2005
6

The deficiencies of micronutrients, not only affect growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport?

  1. Co, Ni, Mo
  2. Ca, K, Na
  3. Mn, Co, Ca
  4. Cu, Mn, Fe
Out of syllabusAIPMT 2005
7

If by radiation all nitrogenase enzymes are inactivated, then there will be no

  1. fixation of nitrogen in legumes
  2. fixation of atmospheric nitrogen
  3. conversion from nitrate to nitrite in legumes
  4. conversion from ammonium to nitrate in soil.
Out of syllabusAIPMT 2004
8

Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone

  1. auxin
  2. cytokinin
  3. ethylene
  4. abscisic acid.
AIPMT 2003
9

Gray spots of oat are caused by deficiency of

  1. Cu
  2. Zn
  3. Mn
  4. Fe
Out of syllabusAIPMT 2003
10

Boron in green plants assists in

  1. activation of enzymes
  2. acting as enzyme co-factor
  3. photosynthesis
  4. sugar transport
Out of syllabusAIPMT 2003
11

Enzyme first used for nitrogen fixation

  1. nitrogenase
  2. nitroreductase
  3. transferase
  4. transaminase
AIPMT 2001

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