Q. No.Which one of the following statements can best explain the term critical concentration of an essential element?
1. Essential element concentration below which plant growth is retarded.
2. Essential element concentration below which plant growth becomes stunted.
3. Essential element concentration below which plant remains in the vegetative phase.
4. None of the above
1. Essential element concentration below which plant growth is retarded.
2. Essential element concentration below which plant growth becomes stunted.
3. Essential element concentration below which plant remains in the vegetative phase.
4. None of the above
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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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Growing plants being suspended in a closed or semi-closed environment by spraying the plant's dangling roots and lower stem with an atomized or sprayed, nutrient-rich water solution is called as:
1. Hydroponics
2. Aquaponics
3. Aeroponics
4. In vitro culture
Plant growing in absence of light will show increased:
1. uptake of minerals
2. uptake of water
3. elongation of internodes
4. ascent of sap
Carnivorous plants are almost entirely restricted to habitats like bogs where:
1. soil nutrients are extremely limiting, but where sunlight and water are readily available.
2. soil has very low nitrogen but other minerals are adequate and there is shortage of sunlight.
3. soil nutrients, sunlight and water are all in very limited supply.
4. soil nutrients are readily available, but where sunlight and water are extremely limiting.
Consider the following two facts regarding mycorrhizae:
A. The percent of plant species that form ectomycorrhizae
B. The percent of plant species that form arbuscular mycorrhizae
1.(A) is greater than (B)
2. Item (A) is less than item (B)
3.(A) and (B) are approximately equal
4. A & B have no relationship
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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