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:
 

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. $N_2$ $\to$ $N{H}_3$
2. $N{H}_4^{+}$ $\to$ $Nitrates$
3. $N{O}_2$ $\to$ $N{O}_3$
4. $N{O}_3$ $\to$ $N_2$

Insectivorous plants grow in the soil which is deficient in:
1.  Mg
2.  Ca
3.  P
4.  N