is used to synthesise amino acids in plants. For it there are 2 main ways
(i)
(ii)
1. Both (i) and (ii) are reductive amination.
2. Both (i) and (ii) are transamination.
3. (i) is transamination and (ii) is reductive amination.
4. (i) is reductive amination and (ii) is transamination.
Which of the following statement is not correct about nitrogen?
1. Plants competes with microbes for limited nitrogen present in soil.
2. Nitrogen is a limiting nutrient for both natural and agricultural ecosystems.
3. During nitrification chemi-hetrotrophic bacteria play very important role.
4. Bacteria such as Pseudomonas and Thiobacillus can produce nitrogen gas from nitrate.
I. Initial acceptor.
II. Extent of photorespiration.
III. Enzyme catalyzing reaction that fixes .
IV. Presence of Calvin Cycle.
V. Leaf anatomy.
Which one does not differ between a and a plant?
1. I and V
2. IV
3. II and III
4. II
In leguminous plant root nodules are formed due to division in cells of
1. Cortex.
2. Pericycle.
3. Both 1. and 2.
4. Xylem and phloem.
Among Nitrogen, Phosphorus, Potassium and Calcium how many of them is required by meristematic tissue :
1. 4
2. 3
3. 2
4. 1
Which of the following set of bacteria involved in nitrogen fixation, nitrification and denitrification respectively?
1. Nitrosomonas, Rhizobium, Nitrobacter.
2. Frankia, Nitrosomonas, Pseudomonas.
3. Rhizobium, Frankia, Nitrobacter.
4. Thiobacillus, Nitrobacter, pseudomonas.
When a plant undergoes senescence, the nutrients may be
1. Exported.
2. Withdrawn.
3. Reduced.
4. None of the above.
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.
How many organisms in the list given below are free living nitrogen-fixing aerobic? Rhizobium Beijernickia Rhodospirllum Azotobacter Frankia
1. 4
2. 3
3. 5
4. 2
Select the correct match with respect to mineral as activator/components of enzymes.
a. Nitrogenase (i) Zn
b. PEPcase (ii) Fe
c. Alcohol dehydrogenase (iii) Mo
d. Catalase (iv) Mg
1. a (iii), b (iv), c (i), d (ii)
2. a (iii), b (iv), c (ii), d (i)
3. a (iv), b (iii), c (i), d (ii)
4. a (iii), b (ii), c (i), d (iv)
When dry weight of tissue is reduced by 10% due to high concentration of a mineral nutrient then
1. It is critical concentration.
2. Mineral nutrient is toxic.
3. Most probably it is macronutrient.
4. It is benificial element.
Match the following columns
Column-I Column-II
a. Mg2+ (i) Alcohol dehydrogenase
b. Mo (ii) RuBisCO
c. Zn2+ (iii) Catalase
d. Iron (iv) Nitrogenase
1. a(iv), b(ii), c(i), d(iii)
2. a(ii), b(iv), c(i), d(iii)
3. a(ii), b(iv), c(iii), d(i)
4. a(iii), b(i), c(ii), d(iv)
The essential element which maintains the ribosome structure is
1. Responsible for carbohydrate translocation.
2. Needed during mitotic spindle formation.
3. Constituent of ring structure of chlorophyll.
4. Needed in the synthesis of auxin.
Which following group of nutrients do plants typically requires the greatest quantity of?
1. Manganese, magnesium and molybdenum
2. Zinc, copper and nitrogen
3. Boron, copper and nitrogen
4. Nitrogen, phosphorous and potassium
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
1. A-i, B-ii, C-iii, D-iv, E-v
2. A-iv, B-i, C-iii, D-ii, E-v
3. A-iii, B-ii, C-iv, D-v, E-i
4. A-ii, B-iii, C-v, D-i, E-iv