Which of the following is a non–symbiotic nitrogen fixing bacteria?
1. Rhizobium
2. Mycorrhiza
3. Azotobacter
4. Nitrosomonas
Anabaena is associated with Azolla's:
1. Stem
2. Leaves
3. Roots
4. Flowers
Which of the following does not contain metal:
1. Glycoproteins
2. Ferritin
3. Cytochromes
4. Chromoproteins
Nitrogen-fixing bacteria converts:
1.
2.
3.
4.
Insectivorous plants grow in the soil which is deficient in:
1. Mg
2. Ca
3. P
4. N
When the plants are grown in magnesium-deficient but urea-rich soil, the symptoms expressed are:
1. Yellowish leaves
2. Colourless petiole
3. Dark green leaves
4. Shoot apex die
Plants take zinc in the form of:
1. ZnSO4 | 2. Zn2+ |
3. ZnO | 4. Zn |
An aquatic fern that is used to increase the yield of paddy crops:
1. Azolla
2. Salvinia
3. Marsilea
4. Isoetes
What is the best pH of the soil for the cultivation of plants:
1. 3.4 – 5.4
2. 6.5 – 7.5
3. 4.5 – 8.5
4. 5.5 – 6.5
Enzyme first used for nitrogen fixation:
1. Nitrogenase
2. Nitroreductase
3. Transferase
4. Transaminase