The deficiencies of micronutrients, not only affect the growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport:
1. Ca, K, Na
2. Co, Ni, Mo
3. Mn, Co, Ca
4. Cu, Mn, Fe
All of the following statements concerning the Actinomycetous filamentous soil bacterium Frankia are correct EXCEPT that Frankia:
1. | Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids |
2. | Can induce root nodules on many plant species |
3. | Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex |
4. | Cannot fix nitrogen in the free-living state |
Which of the following is a non–symbiotic nitrogen fixing bacteria?
1. Rhizobium
2. Mycorrhiza
3. Azotobacter
4. Nitrosomonas
If by radiation all nitrogenase enzymes are inactivated, then there will be no:
1. Fixation of atmospheric nitrogen
2. Conversion from nitrate to nitrite in legumes
3. Conversion from ammonium to nitrate in soil
4. Fixation of nitrogen in legumes
The most abundant element present in the plant is:
1. Nitrogen
2. Manganese
3. Iron
4. Carbon
A nutritionally wild type organism, which does not require any additional growth supplement is known as:
1. Holotype
2. Auxotroph
3. Prototroph
4. Phenotype
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