Cytochrome is                          [2001]

  • Metallo flavoproteins

  • Fe containing porphyrin pigment

  • Glycoprotein

  • Lipid 

Consider the following:

I Facilitation of uptake and utilization of calcium by plants
II. Cell elongation and cell differentiation
III. Nitrogen metabolism
IV. Carbohydrate translocation
V. Water splitting reaction in photosynthesis

The functions of Boron in plants will include:

  • I,II, III, IV

  • I, II, IV

  • II, III, IV

  • I, III, V

Identify a micronutrient for plants amongst the following:

  • Potassium
  • Phosphorus
  • Iron
  • Sulphur

Which element is required by the plants for uptake and utilization of calcium and carbohydrate translocation ?

  • Manganese

  • Boron
  • Chlorine
  • Selenium

During nitrogen fixation, nitrite is oxidized to nitrate with the help of the bacterium:

 

  • Nitrosomanas

  • Pseudomonas
  • Nitrobacter
  • Thiobacillus

Nitrogen-fixing nodules on the roots of non-leguminous plants like Alnus are produced by

  • Rhizobium
  • Beijernickia
  • Azotobacter
  • Frankia

For each molecule of ammonia produced by nitrogenase, the number of ATP molecules required are:

  • 4
  • 8
  • 12
  • 16

The deficiency symptoms of iron, magnesium and calcium in plants may actually be due to the toxicity of

  • Potassium
  • Manganese
  • Iron
  • Chlorine

The criteria for essentiality of an element for a plant include all except:

  • It must be absolutely necessary for supporting normal growth and reproduction
  • The requirement must be specific and not replaceable by another element
  • It must be directly involved in the metabolism of the plant.
  • They must be present in the plants in a concentration in excess of 10 mmole/Kg of dry matter.

Which one of the following is not a nitrogen-fixing organism?

  • Anabaena

  • Nostoc

  • Azotobacter

  • Pseudomonas

Identify the incorrectly matched pair

    Mineral                     Functions in plants

  • Potassium                 Opening and closing of stomata, Activation of enzymes

  • Magnesium                Maintenance of ribosome structure, Structure of chlorophyll

  • Boron                        Pollen germination, Carbohydrate translocation

  • Molybdenum               Water splitting in photosynthesis, Nitrogen metabolism

How many ATP molecules are required to biologically fix one molecule of nitrogen into two molecules of ammonia?

  • 4
  • 8
  • 12
  • 16

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

  • yellowish leaves
  • colourless petiole
  • dark green leaves
  • shoot apex die.

Select the mismatch.

  • Frankia                       Alnus

  • Rhodospirillium            Mycorrhiza

  • Anabaena                   Nitrogen fixer

  • Rhizobium                  Alfa-fa

Which is essential for the growth of root tip?

  • Zn

  • Fe

  • Ca

  • Mn

In which of the following, all three are macronutrients?

  • Iron, copper, molybdenum

  • Molybdenum, magnesium, manganese

  • Nitrogen, magnesium, phosphorus

  • Boron, zinc, manganese

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements involved in this reaction?

  • Manganese and chlorine

  • Manganese and potassium

  • Manganese and molybdenum

  • Magnesium and chlorine

Minerals known to be required in large amounts for plant growth include

  • Phosphorus, potassium, sulphur, calcium

  • calcium, magnesium, manganese, copper

  • potassium, phosphorus, selenium, boron

  • magnessium, sulphur, iron, zinc

Deficiency symptoms of nitrogen and potassium are visible first in

  • senescent leaves

  • young leaves

  • roots

  • buds

The most abundant intracellular cation is

  • Na+

  • Ca2+

  • H+

  • K+

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

  •  NO2-

  • ammonia

  •  NO3-

  • glutamate

Best defined function of manganese in green plants is

  • photolysis of water

  • Calvin cycle

  • nitrogen fixation

  • water absorption

Which one of the following is wrong statement?

  • Anabaena and Nostoc are capable of fixing nitrogen in free-living state also

  • Root nodule forming nirogen fixers live as aerobes under free-living conditions

  • Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins

  • Nitrosomonas and Nitrobacter are chemoautotrophs

A nitrogen fixing microbe associated with Azolla in rice fields is

  •  Spirulina 

  • Anabaena

  •  Frankia

  •  Tolypothrix

The function of leghaemoglobin in the root nodules of legumes is 

  • oxygen removal

  • nodule differentiation

  • expression of nif gene

  • inhibition of nitrogenase activity

Nitrifying bacteria

  • convert free nitrogen to nitrogen compounds

  • convert proteins into ammonia

  • reduce nitrates to free nitrogen

  • oxidize ammonia to nitrates

An organism used as a biofertilizer for raising soyabean crop is

  •  Azospirillum

  •  Rhizobium

  •  Nostoc

  •  Azotobacter

An element playing important role in nitrogen fixation is

  • molybdenum

  • copper

  • manganese

  • zinc

Which one of the following is not a micronutrient?

  • Molybdenum

  • Magnesium

  • Zinc

  • Boron

The free-living, anaerobic nitrogen-fixer is

  •  Beijerinckia

  •  Rhodospirillum

  •  Rhizobium

  •  Azotobacter

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