CBSE
Multiple Choice QuestionsFree living nitrogen fixing aerobic bacterium is
Rhodospirillum
Anabaena
Nostoc
Beijernickia
Beijernickia
N2 + 8e + 8H+ + 16ATP 2NH3 + H2 + 16ADP + 16 Pi
The above equation refers to
Nitrification
Reductive amination
Denitriofication
Transamination
Transamination
Thiobacillus is a group of bacteria helpful in carrying out
Chemoautotrophic fixation
Nitrification
Denitrification
Nitrogen fixation
Which of the following groups of minerals are micronutrients?
Magnesium, Manganese, Copper, Boron and Phosphorus
Manganese, Copper, Magnesium, Zinc and Boron
Nitrogen, Potassium, Manganese, Copper and Iron
Iron, Manganese, Copper, Molybdenum and Zinc
Iron, Manganese, Copper, Molybdenum and Zinc
Which of the following is used as a best genetic vector in plants?
Bacillus thurengiensis
Agrobacterium tumifaciens
Pseudomonas putida
All of the above
Which of the following is not a role played by potassium in plant growth?
Translocation of carbohydrates
Maintaining anion-cation balance
Opening and closing of stomata
Synthesis of protein
Synthesis of protein
Match the mineral in Column I with the enzyme activated in
Column II and choose the correct option.
| Column I | Column II |
| (A) Magnesium | (1) Alcohol dehydrogenase |
| (B) Molybdenum | (2) Phosphoenolpyruvate carboxylase |
| (C) Zinc | (3) Nitrogenase |
A - 2; B - 3; C - 1
A - 1; B - 2; C - 3
A - 2; B - 1; C - 3
A - 3; B - 2; C - 1
A - 3; B - 2; C - 1
Match the Column I with that of Column II and choose the correct combination from the options given
| Column I- Essential elements | Column II- Deficiency causes |
| A. N, K, Mg, S, Fe, Mn, Zn, and Mo | 1. Inhibit cell division |
| B. N, K, S and Mo | 2. Necrosis |
| C. Ca, Mg, Cu and K | 3. Delay in flowering |
| D. N, S and Mo | 4. Chlorosis |
A - 4; B - 3; C - 2; D - 1
A - 1; B - 2; C - 3; D - 4
A - 4; B - 1; C - 2; D - 3
A - 2; B - 3; C - 4; D - 1
A - 2; B - 3; C - 4; D - 1
Which of the following microbes produces nitrogen-fixing nodules in non-leguminous plants?
Rhizobium
Frankia
Azotobacter
Pseudomonas
Pseudomonas
