The product(s) of the reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are.

  • Nitrate alone

  • Ammonia and oxygen

  • Ammonia and hydrogen

  • Ammonia alone

Match the following concerning essential elements and their functions in plants :

(a) Iron            (i) Photolysis of water

(b) Zinc           (ii) Pollen germination

(c) Boron         (iii) Required for chlorophyll biosynthesis

(d) Manganese  (iv) IAA biosynthesis

Select the correct option:

     (a)  (b)  (c)  (d)

  •   (iv) (iii)  (ii)  (i)

  •   (iii)  (iv) (ii)  (i)

  •   (iv)  (i)  (ii)  (iii)

  •   (ii)   (i)  (iv)  (iii)

Mark the correct option w.r.t hydroponics

  • It can avoid problem of soil borne pathogens

  • It avoids problem of weeding

  • Out of season vegetables and flowers can be obtained

  • all of these

In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:

  • Ammonia

  • Glutamate

  • Nitrates

  • Ureides

Which of the following elements helps in maintaining the structure of ribosomes?

  • Magnesium

  • Zinc

  • Copper

  • Molybdenum

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

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  Options :
              A                          B                         C                                D

  • Denitrification      Ammonification              Plants                       Animals
  • Nitrification            Denitrification              Animals                     Plants
  • Denitrification           Nitrification                Plants                      Animals
  • Nitrification             Ammonification            Animals                     Plants

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                     Column II
(mineral)                 (function in humans)

Codes:

I

II

III

IV

1.

1

2

3

4

2.

2

1

4

3

3.

2

1

3

4

4.

1

2

4

3

  • I. Copper                  Buffer action
  • II. Phosphorus            Melaniin synthesis
  • III. Sulphur                CO2 transport
  • IV. Zinc                      Normal metabolism

Match Column-I with Column- II.

Column IColumn II
(a) Nitrococcus
(b) Rhizobium
(c) Thiobacillus
(a) Nitrobactèr		(i) Denitrification
(ii) Conversion of ammonia to nitrite
(iii) Conversion of nitrite to nitrate
(iv) Conversion of atmospheric nitrogen to ammonia

Choose the correct answer from the options given below.

    (a) (b) (c) (d)

  • (iii) (i) (iv) (ii)

  • (iv) (iii) (ii) (i)

  • (ii) (iv) (i) (iii)

  • (i) (ii) (iii) (iv)

Biological nitrogen fixation directly results in the formation of:
 
  • Ammonium ions
  • Nitrate ions
  • Nitrite ions
  • Ammonia
Calcium:
  • is a micronutrient for plants
  • is a constituent of cell membranes
  • is involved in opening and closing of stomata directly
  • is used in synthesis of middle lamella
To be considered as ‘toxic’, the mineral ion concentration in plants should reduce the dry weight of tissues by about:
 
  • 1 %
  • 2 %
  • 5 %
  • 10 %
Regarding diazotrophs [biological nitrogen fixers]:
  •  Frankia produces nitrogen-fixing nodules on the roots of non-leguminous plants
  •  Azotobacter and Beijerinckia fix atmospheric nitrogen only as symbionts
  •  Rhodospirillum is aerobic
  • No cyanobacteria are diazotrophs
For plants the elements such as sodium, cobalt, silicon and selenium be best described as:
  • Beneficial elements
  • Toxic elements
  • Trace elements
  • Macronutrient elements
Bacteria capable of carrying out reduction of nitrate present in the soil include:
 
  • Pseudomonas and Thiobacillus
  • Nitrosomanas and Nitrobacter
  •  Nitrococcus and Nitrococcus
  • Rhizobium and Bradyrhizobium
Which essential element required by plants is used in the synthesis of cell wall, formation of mitotic spindle and accumulates in older leaves?
  • Phosphorus
  • Magnesium
  • Calcium
  • Iron
Alnus can grow in nutrient-poor soils, where few other trees thrive, because of its association with nitrogen fixing bacterium:
  •  Anabaena
  •  Rhizobium
  •  Azotobacter
  •  Frankia
Which element is an activator for the enzymes RuBisCo and PEP carboxylase?
 
  • Zinc
  • Magnesium
  • Potassium
  • Molybdenum
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