Reaction carried out by fixing microbes include
(i) 2NH3 + 3O2 \(\rightarrow\) \(2NO_2^-\) + 2H+ + 2H2O
(ii) \(2NO_2^-\) + O2 \(\rightarrow\) 2NO3
Select the false statement:
1. (i) is carried out by Nitrosomonas or Nitrococcus
2. (ii) is carried out by Nitrobacter
3. Both (i) and (ii) can be called nitrification
4. Bacteria carrying out (i) and (ii) are usually photoautotrophs
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With regard to the Biological Nitrogen Fixation by Rhizobium in association with soyabean, which one of the following statement/statements does not hold true?
1. Nitrogenase may require oxygen for its functioning .
2. Nitrogenase is MO-Fe protein.
3. Leg-hemoglobin is a pink coloured pigment.
4. Nitrogenase helps to convert gas into two molecules of ammonia.
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Match the element with its associated functions/roles and choose the correct option among given below:
A. Boron |
i. Splitting of H2O to liberate O2 during photosynthesis |
B. Manganese |
ii. Needed for synthesis of auxins |
C. Molybdenum |
iii. Component of nitrogenase |
D. Zinc |
iv. Pollen germination |
E. Iron |
v. Component of ferredoxin |
Options:
A | B | C | D | E | |
1. | i | ii | iii | iv | v |
2. | iv | i | iii | ii | v |
3. | iii | ii | iv | v | i |
4. | ii | iii | v | i | iv |
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Plants can be grown in (Select the incorrect option)
1. Soil with essential nutrients
2. Water with essential nutrients
3. Either water or soil with essential nutrients
4. Water or soil without essential nutrients
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Identify the incorrectly matched co-factor in Column I with enzymes in Column II:
COLUMN I |
COLUMN II |
|
1. |
Zinc |
Alcohol dehydrogenase |
2. |
Magnesium |
Cytochrome oxidase |
3. |
Molybdenum |
Nitrate reductase |
4. |
Iron |
Nitrogenase |
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The process of protein synthesis will be adversely affected by the deficiency of which of the following elements in plants despite adequate availability of nitrogen?
1. Potassium
2. Boron
3. Chlorine
4. Copper
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Identify the incorrectly matched essential mineral nutrient in plants [Column I] with function [Column II]:
COLUMN I |
COLUMN II |
|
1. |
Zinc |
Synthesis of auxin |
2. |
Copper |
Activation of enzymes of respiration |
3. |
Boron |
Carbohydrate translocation |
4. |
Chlorine |
Ionic balance |
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A symptom common to the deficiency of Ca, Mg, Cu and K in plants is:
1. Chlorosis
2. Inhibition of cell division
3. Necrosis
4. Delay in flowering
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Majority of the nutrients that are essential for the growth and development of plants become available to the roots due to:
1. Microbial actions in the soil
2. Wet deposition from the atmosphere
3. Addition of fertilizers
4. Weathering and breakdown of rocks
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All the following regarding bacteroid form of Rhizobium are true except:
1. It is a differentiated symbiotic form of nitrogen fixing Rhizobium
2. It is non-motile and non-reproductive
3. It has a more freely permeable membrane than free living Rhizobium
4. It is larger in size than the free living Rhizobium and spherical in shape